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HUUM SAUNA HEATER

How to choose, order, and install HUUM sauna stoves & WiFi sauna controllers


CONTENTS

1. Introduction to HUUM

2. The Story of HUUM

3. How to choose your HUUM wood-fired stove or electric heater

3.1. Calculate the kW output power you will need to heat your sauna (electric &
wood-fired) 3.2. Measure your sauna safety distance requirements (electric &
wood-fired)

3.3. Investigate your sauna wiring and input power (electric only)

3.4. Choose your stones (electric & wood-fired) and air tunnel (electric Hive
online)

3.5. Choose your UKU sauna control system (electric only)

5.1. How to install an electric HUUM sauna stove

5.2. How to install an UKU sauna control system with a WiFi, GSM, or local
connection

5.3. How to place the stones into the heater


1. INTRODUCTION TO HUUM

HUUM combines ancient sauna building principles with contemporary Nordic design
and cutting-edge technology.

Their electric heaters and wood-fired stoves don’t just look good in the sauna,
but are carefully designed with minimal metal to hold a large number of stones
that provide the best possible heat and steam.

HUUM has also designed a smart control system called UKU for electric heaters,
which includes a wall-mounted controller and a mobile app so you can control
your sauna with improved safety and convenience from anywhere — like while
travelling home or out exercising.




2. THE STORY OF HUUM

The founder of HUUM, Siim Nellis, comes from a family of sauna stove builders
over several generations in Estonia.

Following years of technical development, Nellis turned to the Estonian Academy
of Arts in 2011 and challenged students there to help design a more efficient
electric sauna heater that combines traditional Estonian sauna building
knowledge with modern design and smart technology. They decided that modern
sauna stoves are too industrial and that the design focus should be returned to
the stones, as it has been for thousands of years, which provides a superior
heat and steam.

The winning design was the Drop, a wall-mounted electric stove inspired by the
shape of a water droplet.

Despite taking up very little space in the sauna, the Drop design holds 55kg of
stones, which is far more than many wood-burning stoves. After further
development, the Drop was launched in 2014 and immediately received positive
feedback from sauna enthusiasts, as well as several design awards.

As a result, HUUM has continued to grow and invest in further product
development, including the UKU smart control system that would provide sauna
users with added convenience and safety.

The company established its primary presence in Tartu, the academic and cultural
heart of Estonia, but it also relies on skilled expertise from metal workers
across Estonia who individually work on different elements of the production,
much of which is too creative for automated process lines so it requires
handwork.

Their second design was Hive, a larger free-standing stove that is available as
both an electric and wood-fired version. This was launched in 2016 and has
already proved popular in public saunas and spas, as well as larger home saunas.

The technology has evolved too, including the HUUM mobile app which is under
continuous development. This was originally only controlled through an inbuilt
SIM card that requires a connection fee, but HUUM then launched their
WiFi-connected UKU controllers at the start of 2019.

At the end of 2019, HUUM launched two new heater designs, Steel and Cliff, with
smaller safety distances and lower power input requirements in response to the
growing demand for home saunas — especially in smaller spaces such as
apartments.

Demand for HUUM sauna stoves and WiFi controllers has surged in 2024 as more
people spend more time at home and thinking about their health. After global
lockdowns began, total HUUM sales increased more than three times in March.
However, this is merely an acceleration of existing trends as more people invest
in home saunas, which is something that is already normal in our part of the
world. Fortunately, the production is relatively small scale and spaced out
already so it is able to continue safely.

The biggest issue has merely been sourcing enough stones to meet the increased
demand.


3. HOW TO CHOOSE YOUR HUUM WOOD-FIRED STOVE OR ELECTRIC HEATER

As mentioned, there are now four main types of HUUM stoves.

Drop is an elegant wall-mounted stove in the shape of a drop. Hive is a
curvaceous free-standing stove for larger saunas. Cliff and Steel are both
upright stoves with shorter safety distances suited for smaller saunas. They are
all available as electric heaters, while Hive is also available as a wood-fired
stove that can be heated either in the hot room or through the wall from the
next room.

You are welcome to download the manuals for all these stoves in advance, which
contains more detailed information about specifications and safety distances.
Here they are: Drop, Hive, Cliff, Steel.

There are five steps here to understand when choosing a HUUM stove:

 1. Calculate the kW output power you will need to heat your sauna (electric &
    wood-fired)
 2. Measure your sauna safety distance requirements (electric & wood-fired)
 3. Investigate your sauna wiring and input power (electric only)
 4. Choose your stones (electric & wood-fired) and air tunnel (electric Hive
    online)
 5. Choose your UKU sauna control system (electric only)


3.1. CALCULATE THE KW OUTPUT POWER YOU WILL NEED TO HEAT YOUR SAUNA (ELECTRIC
AND WOOD-FIRED)

This first part is for both electric heaters and wood-fired stoves. You’ll need
to determine how much output power you’ll need from your sauna heater or stove
in order to heat your sauna hot room properly.

HUUM heaters and stoves can be used in sauna hot rooms ranging from 3 to 35
cubic metres in size. The output power is measured in kW (for both electric
heaters and wood-fired stoves).

As a very general rule, you will need about 1 kW of power for every 1 cubic
metre of room that you are heating, although slightly more if you have more
non-insulated surfaces (like windows and a glass door) or if you have more
heat-storing surfaces (like brick, concrete or large logs) You’ll also need
slightly more power output if you are using a wood-fired stove.

Most modern sauna hot rooms are built to a fairly standard style, however, with
almost all wooden surfaces and one glass door. Based on that, this table shows
what output power can comfortably heat what size of room:

Electric sauna heaters

3.5 kW: 3 to 6 cubic metres

4.5 kW: 3 to 7 cubic metres

6 kW: 5 to 10 cubic metres

9 kW: 8 to 15 cubic metres

10.5 kW: 10 to 17 cubic metres

12 kW: 12 to 25 cubic metres

15 kW: 15 to 30 cubic metres

18 kW: 18 to 35 cubic metres

Wood-fired sauna stoves

13 kW: 6 to 13 cubic metres

17 kW: 8 to 16 cubic metres

If you have any doubts about the power you’ll need then HUUM has also a great
sauna calculator on their website here.


3.2. UNDERSTAND YOUR SAUNA SAFETY DISTANCES (ELECTRIC AND WOOD-FIRED)

Your stove must be placed at minimum distances from any combustible surfaces.
More detailed information is available in the product guides for each stove
here: Drop, Hive, Cliff, and Steel.

In this guide, we’re not going into details about sauna construction as we are
focused on the stoves, but you do at least need to ensure that the construction
of your sauna meets these minimum safety distances.

Here is an overview of them for every HUUM stove based on type and kW size:


DROP

Drop 4.5 kW A: 100 mm B: 590 mm C: 435 mm

Drop 6 kW A: 120 mm B: 630 mm C: 455 mm

Drop 9 kW A: 150 mm B: 690 mm C: 485 mm


HIVE (ELECTRIC)

Hive 6 kW A: 60 mm B: 580 mm

Hive 9 kW A: 90 mm B: 640 mm

Hive 12 kW A: 120 mm B: 800 mm

Hive 15 kW A: 150 mm B: 860 mm

Hive 18 kW A: 180 mm B: 920 mm


CLIFF

Cliff 3.5 kW A: 60 mm B: 390 mm

Cliff 6 kW A: 60 mm B: 390 mm

Cliff 9 kW A: 120 mm B: 510 mm

Cliff 10.5 kW A: 180 mm B: 920 mm


STEEL

Steel 3.5 kW A: 50 mm B: 420 mm

Steel 6 kW A: 60 mm B: 390 mm

Steel 9 kW A: 100 mm B: 520 mm

Steel 10.5 kW A: 100 mm B: 520 mm


HIVE (WOOD-FIRED)

Hive wood-fired 13 kW A: 250 mm B: 900 mm

HIVE WOOD 17 kW A: 500 mm B: 1000 mm

HIVE HEAT 17 kW LS (through the wall heating) A: 500 mm B: 1000 mm


3.3. UNDERSTAND YOUR SAUNA WIRING AND INPUT POWER (ELECTRIC ONLY)

If you are planning an electric sauna then you’ll next need to know the power of
your main fuse to ensure it matches the input power required for the heater. You
also need to know whether you have 1-phase or 3-phase wiring.

If you have 1-phase, which is standard in most US homes but also found elsewhere
in Europe, then you’ll need to choose a HUUM sauna heater that has up to 9 kW
output power. If you have 3-phase wiring, which is standard in US commercial
premises and most places across Europe, then you can choose any HUUM sauna
heater.

As it happens, when we built our own first sauna with a HUUM heater, we had an
apartment with single phase wiring that couldn’t even handle the kettle and
washing machine being on at the same time! However, we were able to upgrade from
1-phase to 3-phase fairly easily so that is also an option if you need more
power.

If you have any doubt at all about the correct wiring for your property, check
your electricity bill or box — or speak directly to your electricity provider.
And always use a certified electrician for any electrical installation.


3.4. CHOOSE YOUR SAUNA STONES (ELECTRIC AND WOOD-FIRED) AND HIVE AIR TUNNEL
(ELECTRIC HIVE ONLY)

HUUM stones are carefully selected grey rounded volcanic stones gathered in
Finland and known as olivine dolerite in British English or olivine diabase in
American English. These stones are recommended for HUUM stoves for both their
visual aesthetic as well as the quality of the heat and steam that they produce.

In addition, if you choose an electric Hive stove then you have the option of
adding an air tunnel. This is inserted into the mechanism to increase air
circulation among the stones, which helps care for the stove and also improve
the quality of the sauna experience. If you do add an air tunnel then this
reduces the number of stones you will need.

So here are the quantities of stones required to fill each HUUM stove:

 * Drop electric stoves (all): 60 kg of 5 to 10 cm diameter stones.
 * Hive electric stoves (6 & 9 kW) without air tunnel: 120 kg of 10 to 15 cm
   diameter stones and 30 kg of 5 to 10 cm diameter stones.
 * Hive electric stoves (6 & 9 kW) with air tunnel: 80 kg of 10 to 15 cm
   diameter stones and 30 kg of 5 to 10 cm diameter stones.
 * Hive electric stoves (12, 15 & 18 kW) without air tunnel: 220 kg of 10 to 15
   cm diameter stones and 30 kg of 5 to 10 cm diameter stones.
 * Hive electric stoves (12, 15 & 18 kW) with air tunnel: 180 kg of 10 to 15 cm
   diameter stones and 30 kg of 5 to 10 cm diameter stones.
 * Hive wood-burning stoves (13 kW): 90 kg of 5 to 10 cm stones.
 * Hive wood-burning stoves (17 kW): 100 kg of 10 to 15 cm stones and 30 kg of 5
   to 10 cm stones.


3.4. CHOOSE YOUR UKU CONTROL SYSTEM (ELECTRIC ONLY)

If you have chosen an electric stove then you’ll also need a control system for
it. For this, HUUM has developed UKU.

The UKU sauna control system by HUUM include a wall-mounted controller, which is
placed outside the sauna, and available in a range of colours. That colour is
your first decision. We provide a black wall-mounted controller as standard, but
you can pay slightly more for one in white, sand, metallic, olive, or wood.

Your second choice is how the control system is connected. There are three
options: a local connection, a GSM connection (though a mobile network with an
with a embedded SIM) or a WiFi connection (which we recommend and has no annual
fee).

If you choose to have a GSM or WiFi-connected sauna then you will also have
access to the HUUM mobile app, which includes the same controls as the
wall-mounted controller and is being continuously developed with new features.
Both the wall-mounted UKU controller and the app will enable you to not just
switch your sauna on and off, but also see the current temperature, choose your
target temperature, and set a timer. The control system also includes safety
features, including an automatic stove shutdown for overheating or when the door
is open.










Hello,


THANK YOU FOR READING

The HUUM Sauna Heater Blog


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