The DROP 9 kW electric sauna heater from HUUM is inspired by the purest element in nature – a drop of water. Its handsome and artistic rounded design compliments and softens the angular interior of a classic sauna, creating a more elegant appearance. But DROP isn’t only about the looks. This compact wall-mounted heater has an impressive 122-pound stone capacity, exceeding most wood-burning stoves, which guarantees a soft, consistent high heat and long-lasting steam.

Elegant sauna heaters in the heart of your sauna

Forget about boxy-looking heaters. HUUM heaters’ minimalist and round design lets the beauty of the stones show and adds a touch of elegance to your sauna.

Enjoy a mild steam like in a traditional sauna. Thanks to their high stone capacity, HUUM heaters provide a mild and long-lasting steam.

Heat your sauna from your phone. With HUUM app it takes just a couple of clicks on your phone and your sauna will be hot and ready when you get home.

Invest in quality. Each of the heaters is made of stainless steel and receives a lot of special care to look its best and last you a really long time.

Award-winning design

◄Click Here to Know More About The Red Dot Design Awards

HUUM won the world's most prestigious design awards with two products Estonian design heater manufacturer HUUM OÜ participated in the prestigious international design competition “Red Dot Award” and won a product design award for two products. The prize went to the electric heater CLIFF and the sauna control panel UKU. The latest electric heater in the product range, CLIFF, is compact and has extremely short safety distances, making it the ideal solution for smaller saunas. The small safety distances are achieved by optimizing the structure and placement of the internal air tunnel. CLIFF is designed by Mihkel Güsson and the engineer is Anti Reiman. Another award-winning product, UKU sauna controller, makes sauna heating easy and comfortable. Already seven years ago HUUM came out with a remote control, which only now other competitors are catching up with. By using UKU sauna controller it is possible to control the sauna locally, via Wi-Fi network or with a built-in GSM module. Through the latter two it is possible to control the sauna from a mobile application all over the world. UKU is designed by Mihkel Güsson. Maarja Lind, HUUM’s Design Manager, is responsible for further developments in UKU design. The UKU app is designed by Keijo Kraus. Red Dot CEO Professor Dr. Peter Zec on the laureates “The winners of the Red Dot Award: Product Design 2021 were particularly impressive this year. The design of their products is excellent, in terms of both the aesthetic and the functionality. It’s not easy to prevail in such a strong field of competitors and to win over our jury. Consequently, I want to congratulate the laureates very sincerely on their success,” said Professor Dr. Peter Zec, founder and CEO of Red Dot. The Red Dot Award is no stranger to HUUM. In 2015 HUUM’s first electric heater DROP, designed by Mihkel Masso, also received a design award. It is gratifying to note that by 2021 ten Estonian products have won the Red Dot award, three of which belong to HUUM. The award-winning products can be found in exhibitions, online and in the yearbook CLIFF and UKU can be seen in the online exhibition on the Red Dot website from 21 June 2021. That date also marks the beginning of the Red Dot Design Week, during which this year’s award winners and HUUM will be celebrated online. From 22 June 2021, CLIFF and UKU will also be included in the exhibition “Design on Stage” in the Red Dot Design Museum Essen, where all of the award-winning products are showcased. Visitors to the museum can experience the quality of the designs in a space that features contemporary design solutions and historical industrial architecture. The Red Dot Design Yearbook 2021/2022 comes out in August. The publication provides a comprehensive overview of the state of the art and trends in product design. About the Red Dot Design Award: In order to appraise the diversity in the field of design in a professional manner, the Red Dot Design Award breaks down into the three disciplines of Red Dot Award: Product Design, Red Dot Award: Brands & Communication Design and Red Dot Award: Design Concept. With more than 18,000 entries, the Red Dot Award is one of the world’s largest design competitions. In 1955, a jury convened for the first time to assess the best designs of the day. In the 1990s, Red Dot CEO Professor Dr. Peter Zec developed the name and brand of the award. Ever since, the sought-after distinction “Red Dot” has been the revered international seal of outstanding design quality. The award winners are presented in the yearbooks, museums and online. More information is available at www.red-dot.de.

The organic and minimalist design of DROP heater makes it the statement piece of your sauna. Plus, it takes up very little space and fits a lot of stones to keep the sauna hot for long.

Made with care in Estonia

HUUM heaters are made of stainless steel and go through a long and carefully supervised production process to guarantee the best quality of each product.

Easy To use	Soft Steam	Longer Relaxation
Stainless Steel	CE Certification	Safety & control

Steam like in a traditional sauna

HUUM heaters are built by using very small amounts of metal so that the heat comes mainly from the stones and only very little from the metal. This way we can maximize the good negative ions from the stones, like in traditional saunas, and keep the positive ions from the metal at a minimum. Together with a high stone capacity this is our secret to healthy, mild and long-lasting steam.

Sauna Room

Wall materials and insulating the sauna room

In a sauna with electric heating, all massive heat accumulating wall surfaces (brick, glass brick, rendering etc.) must be insulated to use the electric heater with a regular output.

◄Click Here to Know More About Sauna Room

The following sauna wall and ceiling construction is considered to be sufficiently insulated: A carefully installed insulation wool layer of 100 mm (min. 50 mm); The construction is damp proofed with taped aluminium paper or other reflective material; There is a 10 mm air gap between the damp protection and boarding; A light wooden board that is about 12–16 mm thick has been used for interior finishing; There is an air gap of at least 5 mm on the edge of the ceiling panels at the upper part of the wall panelling. In order to use the heater with a regular output, it would be practical to bring the ceiling of the sauna lower (regular 2100 mm – 2300 mm, min. height of sauna room 1900 mm) so that the volume of the sauna room diminishes. The ceiling is insulated with an insulation laer at least 100 mm thick and boarded according to the method described above. Wood should be used to cover internal surfaces; an exception may be made for heat resistant walls in the vicinity of the heater. ATTENTION! Insulating the heat barrier has to be approved by the fire inspector. Insulating flues in use is forbidden! NB! Covering the walls or floor with light protective material, for example, mineral tiles that are installed directly on the surface of the walls or ceiling might cause the dangerous overheating of the wall or ceiling material. .

Darkening of the sauna room walls Due to heat, the wood material in the sauna room darkens in time. If you use wood protection products, you may notice that the wall above the heater darkens before long. The darkening process is also caused by the fine stone dust, breaking away from the heater stones and lifted up by the airflow. If you follow the producer’s instructions upon installing the heater, the flammable materials in the sauna room will not heat to a dangerous level. The highest allowed temperature for the wall and ceiling surfaces is 140˚C.

Floor of the sauna room  The heater stones in use crumble due to temperature changes. The pieces and pebbles breaking away from the heater stones are washed on the sauna’s floor with the steam-making water. Hot stone parts may damage plastic flooring under and near the heater. Heater stone particles and sprays from the steam-making water (e.g., with iron content) may absorb into the light joints of a tile floor. In order to avoid aesthetic damage (caused by the reasons mentioned above), ceramic tiles and dark joint filler should be used under and around the heater. :

Ventilation of the sauna In order to assure a sufficient oxygen supply and fresh air, the sauna’s ventilation must be as efficient as possible. It is advisable to direct the fresh air into the sauna room from above the heater stones. As an alternative, the fresh air may be directed in from under the heater The air inlet must be equipped with an adjustable valve. The exhaust valve must be installed in the opposite wall from the heater at least 20 cm above the inlet valve.

◄A Good Sauna Will Help You Fight off Viruses

Regular sauna baths boost the immune system and keep us healthy during the virus-infested winter season. Sauna’s healthy effect can be explained by two things, mucus and heat. A fair warning: the following is based on scientific research. Some basic facts first. The blanket of mucus in the nasal cavity and paranasal sinuses form the first line of defence against viruses. Despite its nasty name, this watery mucus is highly useful—it catches virus particles and stops them from entering our organism. We then expel the foreign particles and pathogens by sneezing, coughing and blowing our nose, thereby cleaning the blanket of mucus. Every child is thought to use a hanky to cover her nose and mouth when sneezing or coughing to prevent the virus from spreading. And we are all learning how to wear face masks to stop the COVID-19 pandemic for the same reason. Dry air inhibits mucus regeneration Most virus particles are caught by the layer of mucus before they can do harm. However, sometimes the air we breathe dries up the watery mucus, making it easy for the viruses to enter the body. Dry air is perfect for different viruses, including the coronavirus which causes the COVID-19 pandemic, rhinovirus and the influenza virus. Human beings feel comfortable if the indoor humidity is between 25%–70%.[1] But if the relative humidity drops below 20%, the blanket of mucus dries up and our defense against viruses is impaired.[2] In consequence, viruses enter our body and we may fall ill. Sauna to the rescue The relative humidity in a typical sauna is only 10–20%. Yet few people take sauna baths without throwing water on the stove. This activity drastically increases air humidity (up to 80%) and creates perfect conditions for regenerating mucus and repairing tissue. After the layer of mucus is restored in the humid air we are again prepared to fight off viruses—virus particles will be trapped inside the new watery layer on our nasal cavity and paranasal sinuses. High temperature vs. common cold Even if some viruses slip through the first line of defence, sauna’s hot air will kill them off quickly. Many viruses do not tolerate hight temperatures. Human rhinoviruses which cause common cold is one such virus. According to different studies, rhinoviruses reproduce in temperatures lower than 33°C (91°F). It is probably for this reason that rhinoviruses cause upper respiratory infections as they cannot survive deep in the human body where temperatures are higher. Spending only 20 minutes at 45°C (113°F) activates our immune system and reduces rhinovirus’ capability to multiply more than 90%.[3] In sum, sauna is less than an ideal place for rhinoviruses as well as many other viruses. Sauna and COVID-19 Also the coronavirus does not like high temperatures, albeit for a different reason. Coronaviruses are surrounded by an envelope which protects the virus when traveling from one host cell to another. Such viruses are relatively resistant to cold and therefore are more likely to cause sickness in winter months. However, the protective lipid envelope is destroyed if the temperature is held between 55–65°C (131–149°F) for 15–30 minutes.[4] Only one minute will do if the temperature is 80°C (176°F). Human beings can endure such heat, the virus can not. In addition, coronavirus does not tolerate an alkaline environment. In the intense heat of sauna, our breathing becomes deeper and more frequent. This makes our blood pH levels rise. Different strands of the coronavirus cannot reproduce in such conditions, become inactive or disintegrate complete.[5] Is it really so simple? The conclusion seems obvious—taking sauna baths regularly will protect us against viruses. Alas it is not that simple. We have to keep in mind that, even if the sauna thermometer reaches 120°C (248°F), the core temperature of our body rises no more than a few degrees. Yet the virus particles that have already entered into our organism are untouched by the high environmental temperatures and remain intact. Taking sauna baths is not a miracle cure against viruses if we are already sick. Sauna can be used as a preventive measure to boost our immune system, regenerate the mucus blanket in our nasal cavity, and kill off free virus particles in our upper respiratory tracts. But it will not cure us. Even though in most cases taking sauna baths may be good for us, it is best to avoid sauna if you are already sick. Because our body is weak, it cannot deal with sudden and steep temperature changes. A sick and already weak organism simply cannot take it. We may easily weaken our organism further by exposing our sweaty body to colder temperatures in the antechamber or outside.

◄WARNING!

Before turning on the electric heater, always check the sauna room and heater The heater may be used only when it has been correctly filled with stones. Do not cover the heater—this causes fire hazard Do not touch a working heater, it causes burns. Ventilating the sauna room incorrectly may dry the wood too much and cause a fire hazard in the sauna. Only tap water may be used for making steam. Never make steam by using a water hose. There must always be at least 5 cm of fireproof heat insulation under the boarding. Sauna doors must always open outward. Do not use the sauna for any other purpose than it is meant to be used. Do not install more than one heater in the sauna room Undiluted sauna essences etc. may ignite when poured directly on the stones Do not leave small children in the sauna unattended. Sudden cooling after staying in the steam room is not recommended for people with poor health. Consult a doctor. Enjoy the sauna as long as it is comfortable for you. Keep this information in a secure place. The product’s warranty guarantee does not extend to heating elements.

What's Included

• 9kW Sauna heater
• Wall-mount bracket
• Heat reflector
• Installation and operation manual

Not Included

• UKU Control (Sold Separately)
• 122 lbs stones (Qty 4 x 33 lbs. 5-10cm stones boxes) (Sold Separately)

Features

• Unique water-drop design
• 240V/1PH operation
  
• For sauna rooms from 290 to 530 cu.ft.
• Works with UKU controls (sold separately)
  
• 122 pound stone capacity (required 4 boxes sold separately)
• Direct contact between stones and heating elements
• More exposed stones create a longer and milder heat
• Stainless steel construction
• Stainless steel, industrial quality heating elements​
• Wall-mounted design
• Designed, engineered, and crafted in Estonia
• SGS listed for Safety
• Wi-Fi Connectivity (with UKU Wi-Fi, Glass or Mirror)

Specifications 

NB! It is forbidden to use a non-heat-resistant cable with PVC isolation as the power cable. The joint box must be waterproof and it must be located up to 50 cm (19.69") from the floor.

Positioning the heater

Warranty

Buyer is obligated to read user manual and follow instructions and requirements presented. Damage to the product caused by not following instructions and requirements will void warranty.

If any defects are found on the product, where manufacturer can be blamed, then buyer has the right to demand fixing or replacing the product. Demands must be made not later than 5 years after buying the product. Purchase receipt needs to be presented when warranty demands are made.

Downloads

• Installation & Operation Manual
• Product Sheet

Videos

About HUUM

The team consists of enthusiastic sauna fans who believe in the importance of sauna for health and well-being. All of them grew up in Estonia where it would be hard to imagine not going to the sauna at the end of a busy working week, after a cold winter day or on a nice summer evening in the countryside. Sauna means taking time for yourself, regenerating your body and mind, staying healthy and just feeling good. That is why we think that sauna should be available to everybody and everywhere.

Story of HUUM

How the first design sauna heater was born  Sauna heaters have been developed in countries with long sauna traditions without necessarily paying much attention to design. In the search for a more contemporary and efficient design for sauna heaters Siim Nellis turned to the Estonian Academy of Arts in 2011. The product design students of the academy proposed different designs, among which one design stood out. It was inspired by a water drop and had a hemispheric shape. In 2012 the heater was developed for production and it became known as DROP. Unlike other sauna heaters before, DROP had a unique round shape, well-optimized use of metal and an increased stone capacity, which allowed the electric heater to produce a mild steam similar to wood-burning sauna stoves. In 2015 DROP sauna heater won the prestigious Red Dot Award: Product Design, one of the most important international awards for exceptionally good design. DROP sauna heater was acknowledged for a well-implemented design solution.

Encouraging active and healthy lifestyle   HUUM encourages active and healthy lifestyle by sponsoring sports and being active ourselves. They sponsor HUUM IRONMAN triathlon team which consists of young talented athletes. Another team sponsored by them is the Estonian women’s indoor hockey team Sparta who won the Estonian championship in 2018. Their own staff is currently active in disc golf, with their proudest moment being winning the first place in the Estonian enterprises disc golf tournament in April 2019.

Craftsmanship

Take a peek into our production process and discover how our sauna heaters and remote controls are made.

The making of HUUM heaters requires a lot of manual work  Since we got a little creative with our heaters, it isn’t really possible to produce them in fully automated process lines. Getting all the metal rods into the right length, the right thickness and bent in the right shape means a lot of manual work for the metal workers. Our heaters are made of stainless steel and go through shot blasting and acid treatment in order to get their final refined appearance.

Less packaging is more  We use as little packaging material as possible to reduce unnecessary waste and use recycled materials for our products where possible. For example, the case of the main module of the control unit is made of recycled plastic.

Awards

Estonian Union of Interior Designers Award 2014: People’s choice

Product design award Bruno 2014:Readers choice

Golden Egg 2014: Visual identity bronze egg

Estonian Design Awards 2014: Honorable mention

Options & Accessories

UKU Local Sauna Controller

UKU Local sauna controller makes sauna heating easy and comfortable. UKU comes with several safety and extra features for a pleasant sauna experience. It can be used with different manufacturers’ heaters. Color Available: Black (SKU: UKU-LOCAL-BLACK) Blue (SKU: UKU-LOCAL-BLUE) Grey (SKU: UKU-LOCAL-GREY) Sand (SKU: UKU-LOCAL-SAND) White (SKU: UKU-LOCAL-WHITE) Wood (SKU: UKU-LOCAL-WOOD)

UKU Wi-Fi Sauna Controller

UKU Wi-Fi sauna controller makes sauna heating very easy and comfortable. With UKU you can heat your sauna on the spot or do it from your phone through HUUM mobile app. In order to use the mobile app solution, UKU needs to be connected to a Wi-Fi network. UKU comes with several safety and extra features for a pleasant sauna experience. It can be used with different manufacturers’ heaters. Color Available: Black (SKU: UKU-WIFI-BLACK) Blue (SKU: UKU-WIFI-BLUE) Grey (SKU: UKU-WIFI-GREY) Sand (SKU: UKU-WIFI-SAND) White (SKU: UKU-WIFI-WHITE) Wood (SKU: UKU-WIFI-WOOD) Glass (SKU: UKU-WIFI-GLASS) Mirror (SKU: UKU-WIFI-MIRROR

Safety Rail for DROP Series Sauna Heaters

Safety railing for DROP heater helps to protect you from accidentally touching against the hot heater. The safety railing consists of light-colored wooden arcs and stainless steel supports to attach them to the heater. Not only does the railing provide extra safety – but it is also a nice way to style your heater. SKU: DROP-RAIL Color / Finish: Wood / Stainless Steel Weight: 3 lbs Dimensions: 23"L x 9"W x 3"H

Small Sauna Heater Stones

33 lbs of 2" - 4" (5-10 cm) of rounded olivine sauna stones. We highly recommend using rounded stones in HUUM heaters to compliment the design and have milder steam. The stones are durable and have high heat capacity. SKU: STONES-SM-33 Weight: 33.95 lbs Dimensions: 15"L x 11"W x 4"H

Embedding Flange for DROP Series Sauna Heaters

The HUUM Flange D embedding flange is useful when you are planning to install your DROP stove partly inside the sauna bench. It is made of stainless steel and it covers up the wooden edges around the stove, leaving the final result looking refined and smooth. SKU: DROP-EFLANGE Dimensions: 15" Radius) x 2" Depth

1500 W Element for DROP Heater

Heating element for DROP 4.5 kW and DROP 9 kW heaters SKU: DROP-EL15 Weights: 1.2 lbs Dimensions: 9" L x 14" W

2000 W Element for DROP Heater

Heating element for DROP 6 kW and DROP 9 kW heaters SKU: DROP-EL20 Weights: 1.3 lbs Dimensions: 9" L x 14" W

Frequently Asked Questions

◄1. Support

The temperatures differ on the remote control and sauna thermometer   Yes! There are two integrated stereo speakers on each model. Are the temperature sensor and sauna thermometer placed in different parts of the sauna room where temperatures are actually very different? Is the temperature sensor too close to the heater? Too close to the door? The best place to install it is on the opposite wall from the heater approximately 15 cm from the ceiling and away from ventilation tubes and windows. Does your sauna thermometer work properly? You probably need to replace your temperature sensor when even after fixing all the above-mentioned issues: The temperature difference is more than 20 degrees The temperature displayed on the remote control changes very suddenly or keeps fluctuating The message “Sensor error” is displayed There could be a problem with the cable connection. Take down the sensor and try connecting it to the main module using another suitable cable. If the sensor works, you just need to replace the cable. If it still does not work, the sensor needs to be replaced.

The remote control display does not turn on   In most cases, this happens when the cables of the remote control are not connected correctly. First, you should make sure that all the cables are connected to the main module according to the scheme in the installation manual. This should preferably be done by a certified electrician. Also, check if any cables attached to the remote control have come loose. If after checking all the cables the remote control still doesn’t work, please contact us at support@usbathstore.com

The controller does not establish a network connection   If your UKU GSM controller does not connect to the network after connecting your app user account to the controller, please contact us and send a photo of the log (Menu -> GSM status -> log). If your UKU Wi-Fi controller does not connect to the network: Make sure you are using a 2.4GHz Wi-Fi network, instead of 5GHz. Make sure your different Wi-Fi networks don’t have the same name and that the chosen network name is no longer than 20 characters. If your Wi-Fi controller still does not connect to the network, take a picture of the error log displayed after pressing “Connect”, and e-mail it to us at support@usbathstore.com

Are you using the SIM card that arrived with the controller?   Contact us at support@usbathstore.com

Are you using another SIM card?   Check if the mobile data has run out. Find out if your service provider has changed the APN settings. If the APN settings have changed, update the settings also in the settings menu of the controller. Take the SIM card out and try if it works on your phone. If none of this helped, contact us at support@usbathstore.com

◄2. About heaters

What is unique about HUUM sauna?   HUUM heaters’ minimalist and rounded design makes them some of the most elegant sauna heaters available. Thanks to an exceptionally high stone capacity they provide mild and long-lasting steam similar to traditional saunas. Little metal is used in the heaters, so the heat comes mainly from the stones and not from heated metal. This means there are more negative ions in the air, which are known to be beneficial for health. Using the heater together with a UKU Wi-Fi or GSM controller allows you to heat your sauna comfortably from your mobile phone.

What size saunas are HUUM heaters suitable for?   Among HUUM heaters you can find suitable models for both small and big sauna rooms with volumes ranging from 3-35 m³.

How do I choose a heater with the right output?   Heater output should be chosen based on the sauna room size and insulation. As a rule of thumb, you need 1 kW of power to heat 1 m³ of the sauna room. If the heater is too small it will heat the sauna too slowly, it won’t provide enough steam and it might burn out quicker. However, a heater that is slightly too powerful won’t cause trouble if it has a thermostat and it is used correctly. The second important thing to consider is how the sauna room is insulated. In case there are any uninsulated brick, tile, glass or log walls in the sauna room, an additional volume of 1.5 m³ for each m² of such wall should be added to the sauna room size calculation. You can use our sauna calculator to find out the volume of your sauna room. To calculate it yourself, multiply the height by the width and the length in meters. Then calculate the sum of uninsulated brick, tile, glass or log surfaces (m²), multiply it by 1.5 and add it to the previous result. As a result, you will have your sauna room volume in m³, based on which you can choose the suitable heater output. If the result falls between two different output values, we recommend choosing the bigger one.

How long does it take to heat the sauna?   If the heater is the right size, the heating speed is about 10°C per approximately every 8 minutes, reaching 80 °C in one hour.

What kind of stones can be used with HUUM heaters?   We recommend using natural and rounded sauna stove stones. In our selection, we have olivine diabase stones, which are light grey, rounded and with high heat capacity. Do not use decorative stones in the heater because they can easily break.

How long does it take to heat the sauna?   If the heater is the right size, the heating speed is about 10°C per approximately every 8 minutes, reaching 80 °C in one hour.

What material are HUUM heaters made of?   HUUM heaters are made of stainless steel. Read more about the production on the Craftsmanship page.

How long is the guarantee?   All HUUM sauna heaters have a 5-year guarantee.

What is included in the set?   The set includes the heater and adjustable legs (HIVE) or wall mount (DROP). The set does not include: stones, controller, power cable.

Who can install the heater?   Only a certified electrician should install the cables and connect the heater to the power supply.

How can I replace my existing sauna heater with a HUUM heater?   If you have a sauna heater with a controller with a temperature control function, just replace the heater. Install the heater according to the product installation manual and with the help of a certified electrician. Do you have a mechanical sauna heater without a controller (the switch is on the heater)? In that case, you will need a controller with temperature control function and you will need to set up some cables. Follow the instructions from the product installation manuals and do it with the help of a certified electrician. You might need to open up some walls and install new cables.

Which kind of wiring will I need?   You will find the instructions for installing cables from our product installation manuals. Cables need to be installed by a certified electrician.

◄3. Installation

Check before installation   Check if the power of the main fuse matches the parameters of the heater. Does the output (kW) of the heater match the volume (m3) of the sauna room? In case there are any uninsulated brick, tile, glass or log walls in the sauna room, an additional volume of 1.5 m3 should be added to the sauna room for each square meter of such wall.

Positioning the heater   DROP heater should be positioned on the wall close enough to the sauna bench so that you can easily throw water on the stones from the bench. The top layer of stones should be at the level of your feet when you are sitting on the sauna bench. Check Table 1 for minimal safety distances between the heater and the sauna room’s ceiling and walls. Pay attention to placing the heater in a way that prevents dangerous situations during its use. Make sure people do not have to pass it too closely when it is hot. Before installation remove the protective film from the steel plate behind the heater. When installing the wall mount, consider the full weight of 65 kg.

Connecting the heater to the power supply   Only a certified electrician is allowed to connect the heater to the power supply! The main cable input is located in the center of the heater, 10 cm above the lower edge. A rubber insulated SIHF-JB cable or an equivalent cable must be used as the connection cable. It is forbidden to use a non-heat-resistant cable with PVC isolation. The joint box must be waterproof and it must be located up to 50 cm from the floor. We recommend connecting the unit to the mains without an earth-leakage circuit breaker. Check Table 2 for the maximum current intensity in the cross-sectional area of the cable and circuit breaker. Open the cover of the heater’s electrical box. Attach the power cable on the terminal block according to the circuit diagram. Close the cover. Fix the cable on the output with a cable strap. Install the heater on the wall frame. Make sure it remains securely attached to the wall.

Stones   DROP heater requires 55 kg of 5-10 cm stones (4 x 15 kg boxes). Read more about how to stack the stones correctly.

◄4. UKU controller installation

All UKU controllers come with several extra features   Lights/ventilation and vaporiser control Door sensor Overheating protection Child lock Timer UKU Wi-Fi and UKU GSM controllers also have a remote control option through the mobile app

The set includes   Control panel; Main module; Temperature sensor; Door sensor; Temperature/door switch cable (5+5 m; 2 x 0.22 mm²); User interface cable (3 m; 4 x 0.34 mm²).

Important things to know before installation   Only a qualified electrician may install the device. Make sure that the building’s cables from the main switchboard to the desired location in the sauna have a sufficient cross-section. In case of an older building, pay attention to the condition of the connecting boxes and if possible, install a new cable from the switchboard to the sauna. We recommend connecting the unit to the mains without an earth-leakage circuit breaker. The cable connecting the main module with the heater must be heat-resistant (90°C). All the cables will connect to the main module.

Where should the control device be installed?   The control panel must be installed outside the steam room at the user’s eye level next to the door or according to the manufacturer’s recommendations. Install the main module in a dry place that is easy to access. We do not recommend installing the main module in the sauna room. Doing so will be at your own risk. The main module should be installed in a place where the ambient temperature does not exceed 50°C and relative humidity is not higher than 95%. The protection degree of the device is IP65. If your control device supports the use of Wi-Fi or GSM connections, make sure you install the main module where the appropriate reception is available.

◄5. Mobile app connectivity

How to use mobile app   With HUUM mobile app you can heat your sauna comfortably from wherever you are. You can choose the beginning and end time of the heating, set the desired temperature and check the sauna temperature in real-time. HUUM mobile app works with UKU Wi-Fi and UKU GSM controllers. Download HUUM mobile app on your phone (or open HUUM web application) Sign up Fill in the required fields and create an account. Insert sauna ID and sauna code You can find the ID number and the code number on the cover of the main module. UKU Wi-Fi will connect to the mobile app instantly if it is already connected to a Wi-Fi network. UKU GSM controller will establish a mobile data connection in 30 minutes. Select heating time and temperature The app allows you to set the desired temperature and the beginning and end time of the heating. Your sauna is heating You can check the sauna temperature in real-time from the app. A notification will let you know when the sauna is ready. Keep your app updated Make sure to update your app regularly so that it can function well. We recommend switching on automatic updates.

◄6. Problems with controllers

The temperatures differ on the remote control and sauna thermometer   Some difference in the measured temperature is considered normal because of the measurement uncertainties of the devices. If the difference is more than 10-15 degrees you should check your temperature sensor and sauna thermometer. Are the temperature sensor and sauna thermometer placed in different parts of the sauna room where temperatures are actually very different? Is the temperature sensor too close to the heater? Too close to the door? The best place to install it is on the opposite wall from the heater approximately 15 cm from the ceiling and away from ventilation tubes and windows. Does your sauna thermometer work properly? You probably need to replace your temperature sensor when even after fixing all the above-mentioned issues: The temperature difference is more than 20 degrees the temperature displayed on the remote control changes very suddenly or keeps fluctuating the message “Sensor error” is displayed There could be a problem with the cable connection. Take down the sensor and try connecting it to the main module using another suitable cable. If the sensor works, you just need to replace the cable. If it still does not work, the sensor needs to be replaced. In these cases, please contact us at support@usbathstore.com

The remote control display does not turn on   In most cases, this happens when the cables of the remote control are not connected correctly. First, you should make sure that all the cables are connected to the main module according to the scheme in the installation manual. This should preferably be done by a certified electrician. Also, check if any cables attached to the remote control have come loose. If after checking all the cables the remote control still doesn’t work, please contact us at support@usbathstore.com

The controller does not establish a network connection   If your UKU GSM controller does not connect to the network after connecting your app user account to the controller, please contact us and send a photo of the log (Menu -> GSM status -> log). If your UKU Wi-Fi controller does not connect to the network: Make sure you are using a 2.4GHz Wi-Fi network, instead of 5GHz. Make sure your different Wi-Fi networks don’t have the same name and that the chosen network name is no longer than 20 characters. If your Wi-Fi controller still does not connect to the network, take a picture of the error log displayed after pressing “Connect”, and e-mail it to us at support@huum.eu.

The controller lost its network connection   Are you using the SIM card that arrived with the controller? Contact us at support@usbathstore.com Are you using another SIM card? Check if the mobile data has run out. Find out if your service provider has changed the APN settings. If the APN settings have changed, update the settings also in the settings menu of the controller. Take the SIM card out and try if it works on your phone. If none of this helped, contact us at support@huum.eu.

◄7. Problems with heaters

The electric heater does not heat up after installation   Some difference in the measured temperature is considered normal because of the measurement uncertainties of the devices. If the difference is more than 10-15 degrees you should check your temperature sensor and sauna thermometer. Are the heating elements working properly? To find that out, remove some stones and check if the heating elements turn red while heating. If a heating element does not turn red it is broken and needs to be replaced before further use. Is there a problem with wiring? Before checking that, disconnect the heater from the power supply. Make sure that all the cables of the heater and the control console are connected to the main module according to the manual.If you did not manage to solve the problem, contact us and send us a photo of the main module’s wiring.

The electric heater stopped heating up   Are the heating elements working properly?To find that out, remove some stones and check if the heating elements turn red while heating. If a heating element does not turn red it is broken and needs to be replaced before further using. Check if heater or control console cables have come loose. Ask an electrician to check if all three phases are connected and actually reach the heater. If the previous steps did not provide a solution, the problem may be in the main module. In that case, contact us and send us photos of the wiring of the heater and the main module.

Why does my electric heater heat up too slowly?   Does your heater have sufficient output for the size of your sauna room? Check the product page. Did you take the uninsulated and glass surfaces into account when calculating sauna room volume? Are the heating elements working properly? To find that out, remove some stones and check if the heating elements turn red while heating. If a heating element does not turn red it is broken and needs to be replaced before further use. Is there too much ventilation in the sauna room?

◄8. User guides: Using the heater

What is the correct way to pour water onto the heater?   Pouring water onto the hot stones in the heater is how you can regulate the humidity in the sauna. To do this right, wait until the stones are hot enough to make the water evaporate. In order to prevent the stones from breaking you should use hot tap water. The water should be as clean as possible and you should avoid using very hard water or water that is high in iron. We recommend throwing approximately 250 ml of water at a time. If you need more steam, wait a few minutes and throw some more water on the stones. Doing so allows the stones to dry and regain the heat between the pourings. If you notice water running out from the bottom of the heater, it means you have poured too much water or that the stones are not hot enough.

How often do the stones need to be replaced?   It depends on how often do you use your sauna. If you use your sauna 3 times a week, you might need to replace the stones about once a year. If you use the sauna less, you probably should replace the stones every couple of years. To understand if the stones need changing you should check their condition once a year or after 300 hours of heating. Read more about it in the stones chapter.

Electric heater maintenance   Pay attention to your heater’s condition, especially if it has not been used for a while. Check the condition of the stones once a year or after about 300 hours of use. Clean the stones when necessary and replace them when they have started crumbling. Read more about it in the stones chapter. When you are cleaning or working on your heater, make sure the power supply is disconnected and the heater isn’t hot.

How often do the heating elements need to be changed?   Heating elements need to be changed only when they break.

Can I use my electric heater if a heating element is broken?   You can verify if heating elements are broken by removing some stones and checking if the heating elements turn red during heating. If a heating element doesn’t turn red, it is broken. When this happens, the broken heating element needs to be replaced immediately. Otherwise you risk breaking also the functioning ones. Only an authorized electrical engineer can change the heating elements.

How to keep the sauna clean?   Between heatings, when the sauna is not hot and there is still a lot of humidity, unwanted bacteria may start thriving in the sauna. To avoid this, it is important to take care of the cleanliness of the sauna. Here are a couple of tips for keeping your sauna clean. Always take a quick shower before starting your sauna session. Before taking a seat on the sauna bench put something under you, like a towel or a special sitting mat that can easily be cleaned afterwards. Clean the sauna room, the sauna bench and the shower room (don’t forget the drains) regularly with a disinfecting detergent. After using the sauna open windows and doors to let the rooms dry.

◄9. User Guides: Controller

Using the Controller   With UKU LOCAL you can heat the sauna from the control panel. With UKU WI-FI and UKU GSM, you can heat the sauna from the control panel and also from HUUM mobile app. With all UKU models you can: choose a suitable temperature (40-110 °C) set the heating period (3, 6, 12 or 18 h with control panel; any period with mobile app) use the timer to select a starting time for heating.

How to use the controller?   To turn on the control panel, start or end the heating, press the button once briefly. Go to the settings menu (press and hold the button for 10 seconds) to set the desired heating period. You can choose between heating times of 3, 6, 12 and 18 hours. By default, the heating period is set to 3 hours. To choose the temperature, just turn the knob. The number displayed in the upper right corner of the screen is the target temperature of the sauna. The current temperature is displayed in the center of the screen. Press the button to start heating. You can also use the timer to decide when do you want the sauna to start heating. To activate the timer function, press and hold the button for 3 seconds. Then, choose what time would you like the heating to start and switch the timer on with a single short press on the button. During heating, the screen is always active and a heating icon will appear above the temperature value. The control console will turn off automatically after the heating or when you have stopped using the button without heating. You can access other functions, such as vaporiser, lighting and child lock from the settings menu. To open the settings menu, press and hold the button for 10 seconds.

Vaporiser   You can select the vaporiser function from the settings menu. When the vaporiser function is selected, you can increase the steam output by pressing and holding the button and turning it to the right. To reduce steam output, press and hold the button and turn it to the left. In the lower left corner, the setting is shown from 1 to 10. Heat intensity is displayed as an indicator in the lower left corner (from 1 to 10).

Lighting   Hold the button down for 10 seconds to select the lighting function from the settings menu. When the lighting function is selected, you can turn the light on and off with two quick button presses.

Child lock   The child lock can be turned on from the settings menu. When activated, the child lock will automatically turn on when the screen of the control console turns off. To activate the screen while the child lock is on, press and hold the button and turn it 30 degrees to the right, then 30 degrees to the left and then back.

◄10. Choosing remote control

Wi-Fi   UKU Wi-Fi needs to be connected to a Wi-Fi network to connect to the mobile app. That is why it is suitable for home saunas or other saunas that are already in Wi-Fi range.

GSM   UKU GSM allows you to use the mobile app option even if your sauna is not in Wi-Fi range or it is inconvenient to set it up. It is a good solution, for example, for holiday houses that are not in use all year round.

Local   If you are not interested in heating your sauna from the phone, UKU Local may be the right choice.

◄11. Heat your sauna comfortably with HUUM mobile app

Benefit   The main benefit of this is you don’t even have to be home to heat your sauna. You could be anywhere and have your sauna hot and ready at exactly the moment you step in the door. This is a great advantage for many home sauna owners as well as accommodation establishments. Continue reading and discover: How heating the sauna from your mobile phone can benefit you and also your accommodation establishment; Do you need for heating your sauna through the mobile app; How HUUM mobile app works and what features it offers.

Save time with HUUM mobile app   A HUUM sauna controller with the mobile app remote control option has two important advantages. Firstly, it saves you a lot of time. Let’s say heating the sauna takes about an hour. With a regular sauna controller, it would mean that once you arrive home you would still have to wait an hour before you can actually use it. With a mobile app remote control, you can start heating the sauna even without being home yet. You can just activate the sauna heater from your phone and spend that hour finishing up at work or exercising at the gym. In moments when you need a hot sauna the most, you don’t have to wait for it. Maybe you have just spent an entire day skiing or you’re on your way back from a long trip. What could be more welcoming and regenerating than a hot sauna waiting for you the moment you step through the door. We asked our customers how is the mobile app working for them and how are they using it. Harry from Finland wrote us this: “Yes, I use the HUUM app frequently, in fact, I always switch the sauna on with the app, whether I am at home or not. When I’m sitting on the sofa – yes, why not switch the sauna on from the phone? When I’m in the garden – there’s no need to go inside the house, I just switch it on while I’m outside. When I’m shopping in the city center, working late at the office or walking outside with my dog – why not switch the sauna on to have it ready by the time I’m back home? It’s simple and easy.” Another useful aspect is that you don’t have to be physically present to heat the sauna. Here lies a great opportunity for the owners of Airbnb apartments, guesthouses and other accommodation establishments looking to offer something special to their guests. Adam Rang from Estonian Saunas is already using this smart sauna solution with his Airbnb guests in Tallinn. He provides his guests with sauna log-in information before their journey there. This way the guests can activate the sauna heater accordingly to their travel schedule and have a hot sauna waiting for them on their arrival. Also, during their stay in Tallinn, they can always set the sauna to a perfect temperature for their return to the apartment after having spent an entire day exploring the city.

HUUM mobile app works with UKU Wi-Fi and UKU GSM sauna controllers   If you would like to heat your sauna with the HUUM app you first need to purchase a sauna controller with that feature. So, you should have either UKU Wi-Fi or UKU GSM controller installed in your sauna. These controllers can be used with any manufacturer’s electric heaters as long as they work with remote control and have a temperature control function. Once the controller is in place, all you need to do is download the HUUM app into your phone and connect it to your controller. To do that, just follow the instructions on the screen and insert your sauna controller’s ID and code when requested. After that, you are ready to heat your sauna from the app and enjoy all its features.

Prepare your sauna experience with a few taps on the phone   HUUM mobile app is about more than just switching the sauna heater on and off. It provides several useful features for adjusting your sauna experience to your wishes. First, let’s go over the basic functions. When it comes to heating, you can choose the beginning and end time of the heating and set the desired temperature. Thanks to the door sensor of the UKU control unit, the app will know if you have left your sauna room door open and will not allow heating in that case. While the sauna is heating, you can check the current temperature at any moment to see how it’s proceeding. If you already know exactly what time you need your sauna to be hot, the timer function comes in handy. Just activate the timer and have the sauna heated exactly by the time you arrive home from a workout or in time for a sauna party. HUUM sauna controllers can be connected to the lights, ventilation and steamer functions which can be controlled through the mobile app as well. In order to do that you must first activate these functions from the control panel on the wall. The number of app users is unlimited. Anybody who has the sauna controller ID numbers can download the app and connect it to the heater. This way all the family members can heat the sauna from the app and always see if the sauna is already being heated. Friends invited over for a sauna session can keep an eye on the sauna temperature to know if it is ready yet. HUUM mobile app comes in the following 6 languages: English, German, Russian, Italian, Finnish and Estonian.

Innovative sauna controllers for modern sauna lovers   If you value time and appreciate comfort, heating the sauna through HUUM mobile app might just bring your sauna to a new level. This easy and time-saving sauna controlling solution helps to better insert enjoyable sauna moments into a busy modern lifestyle. To find out more about HUUM mobile app sauna controllers take a look at the product pages of UKU Wi-Fi controller and UKU GSM controller. And since picking a sauna controller can be confusing, we dedicated a separate blog post to just this. In the post, we explain thoroughly the features of each HUUM sauna controller.