Harvia The Wall 9kW
Fenix touch panel on the wall, plus the MyHarvia app
- Power
- 9 kW
- Supply
- Hard-wired by an electrician
£2.96a session
£38a month
Outdoor Living Cube Sauna - 4-5 Person Outdoor Sauna
Model: OLOTCU
Regular price £4,250.00
Unit price ⓘ Unit price based on the product measurement shown.
Outdoor Living
A big glass-fronted garden sauna, with benches in an L
The Outdoor Living Cube is a spacious outdoor sauna in thick spruce, with three tall glass panels across the front and two deep benches set out in an L. Plenty of room to sit back, or lie down, in proper Finnish heat.
Up to 5people
73 cmdeep benches
3glass panels
- 1Glass side panelsEither side of the door
- 2Glass doorOpens outwards
- 3Red-brown shinglesOver a waterproof membrane
- 4Steel hoopsHold the frame tight
- 5L-shaped benches73 cm deep
- 636 to 38 mm spruceThick walls that hold the heat
- 7Foundation beamsLift it off the base
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Three glass panels
A glass door between two tall glass side panels fills the sauna with daylight and keeps the garden in view.
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Deep L-shaped benches
One bench runs along the left wall and one along the back, both 73 cm deep, so there is room to stretch out.
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Thick spruce walls
The walls are 36 to 38 mm spruce, which holds the heat well and gives it a natural, authentic feel.
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A proper roof
Red-brown asphalt shingles over a waterproof membrane keep the rain out, and steel hoops hold the frame tight.
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Harvia heat
Choose Harvia The Wall 9 kW with the Fenix Wi-Fi panel, or a Harvia Cilindro 6.8 kW with dials on the heater.
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Steam the Finnish way
Ladle water over the hot stones for soft, rolling steam, called löyly.
Why people love a garden sauna
- A proper switch-off
- Twenty minutes of dry heat is a simple way to wind down after a long day.
- Warm whatever the weather
- Wet, cold or dark outside, it is a warm place to be in minutes, not hours.
- Time together
- Room to talk, with no screens and no distractions.
- Hot and cold
- Pair it with a cold shower or an ice bath for the full Nordic routine.
What the Cube needs from your garden
It is a big building, so plan the base, the space around it and the power before it arrives.
A firm, level base
Concrete, paving or another hard, level surface that can take about 850 kg, plus the people inside. Don't stand it on grass or soil.
Space around it
The sauna is 235 × 220 cm. The manual asks for at least 5 cm round the sides and 30 cm above. We suggest about 50 cm all round, so it is easy to treat the timber and look after it. At 225 cm tall it is under the usual 2.5 m limit for garden buildings near a boundary, but check with your local council.
A dedicated electric supply
Both heaters are hard-wired, not plugged in. A qualified electrician runs a dedicated supply from your consumer unit, on a standard 230 V supply, with an isolation switch near the sauna.
235 × 220 × 225 cmLength, width and height
46 × 173 cmDoor
About 850 kgBuilt weight, before people
Up to 5 peopleSeats
Built for a British garden
What is in the walls, the glass and the roof.
How the Cube is built
Walls
36 to 38 mm spruce.
Thick spruce holds the heat well. It arrives treated against moisture and weather, and a twice-yearly treatment keeps it that way.
What to watch for elsewhere
Thin boards.
Thin walls lose heat quickly, so the sauna takes longer to warm up and costs more to run.
How the Cube is built
Frame
Rounded, held by steel hoops.
Steel hoops wrap the rounded shell and hold it tight.
What to watch for elsewhere
Screwed flat panels.
Flat boards rely on screws and joints, which can open up as the timber moves.
How the Cube is built
Glass
A glass door and two glass panels.
Three tall panels across the front fill the sauna with daylight. The door opens outwards, as a sauna door should.
What to watch for elsewhere
Small windows.
A small window keeps a big room dark.
How the Cube is built
Roof
Shingles over a waterproof membrane.
Red-brown asphalt shingles shed the rain, with a membrane underneath as a second barrier.
What to watch for elsewhere
Bare timber on top.
Without a covering, the top takes the full force of the weather.
How the Cube is built
Benches
Two deep benches in an L.
Both benches are 73 cm deep, with adjustable backrests, so you can sit back or lie down.
What to watch for elsewhere
Narrow benches.
A shallow bench leaves no room to stretch out.
Your heater and what it costs to run
Choose Harvia The Wall 9 kW with the Fenix Wi-Fi panel, or a Harvia Cilindro 6.8 kW with dials. 9 kW warms a room this size faster. Pick one above and the figures here follow your choice.
Recommended
Harvia Cilindro 6.8kW
Dials on the heater for heat and timer
- Power
- 6.8 kW
- Stones
- 80 kg
- Supply
- 35 A, 230 V hard-wired
£2.24a session
£29a month
How we work this out: a 45-minute warm-up at full power, then a one-hour session with the heater on about half the time, so about 1.25 hours at full power. Electricity at 26.32p per kWh, the Ofgem price cap from October to December 2026. A month is 4.3 weeks. Your costs depend on your tariff, the weather and how hot you like it.
Your first sauna session
There is no wrong way to sauna, but this simple rhythm is how most Finns do it.
- Warm it up
Switch on 30 to 45 minutes before. Most people enjoy 70 to 90°C. Take a quick shower first.
- Sit in the heat
Stay 8 to 15 minutes. Sit up tall for more heat, or put your feet up on the bench for even warmth. Ladle a little water on the stones for a burst of soft steam.
- Cool down
Step out for a cold shower, a dip in an ice bath or just fresh air.
- Rest and repeat
Sit down, drink some water, and when you are ready go back in. Two or three rounds is plenty.
A 1-year Outdoor Living warranty
Our own sauna, looked after by our UK team.
Your Outdoor Living Cube sauna comes with a 1-year Outdoor Living warranty, and your Harvia heater is covered by Harvia. If anything goes wrong, call us first and we'll sort it out.
1-year warranty
Help from our UK team
Looking after the timber
Spruce is a natural timber, so a little care keeps it sound and looking good.
Treat it twice a year
Treat the wood inside and out twice a year, with products made for saunas and for temperatures over 110°C. It arrives treated.
Let it dry out
After a session, leave the door ajar so the inside dries. Don't use sealants inside: they can give off fumes in the heat.
Sit on a towel
It keeps the benches clean and stops sweat marks soaking into the spruce.
Check the stones
Re-stack the heater stones once a year and replace any that have crumbled.
What our customers say
Rated by our customers
Independent reviews from people who bought from us, collected and shown by Trustpilot.
Who we work with
Hull FC
Hull City
Queens Park Rangers
DIY SOS The Big Build
Delivery and installation
Here is how your sauna gets to your garden.
Order online
Choose your heater and place your order. Nothing is sent automatically.
We call you
Our team phones to check access, your base and your electrics, and to agree a delivery date.
It arrives
Flat-packed at the kerb, or delivered and built on your base by our installers.
Choose how far we take it
Pick your option at checkout.
Flat-pack kerbside delivery
Build it yourself£149Arrives packed at the nearest accessible point outside your property. The manual takes you through the build. It is a job for four people.
Delivery and installation
We build it for you£899Our installers deliver the sauna and build it on your prepared base. Have the base ready, and a qualified electrician lined up to connect the heater.
Tight access, such as a narrow side path, may affect delivery, so tell us about it when we call. Read the delivery guide
Questions people ask
The things people usually want to know before they buy.
How many people fit?
Up to five, on two deep benches set out in an L.
Which heater should I choose?
The Wall 9 kW warms it faster and you can start it from your phone with the Fenix Wi-Fi panel. The Cilindro 6.8 kW is set by hand with dials on the heater.
Does the wood need treating?
Yes. It arrives treated, and we recommend treating it inside and out twice a year, with products made for saunas.
Do I need an electrician?
Yes. Both heaters are hard-wired to their own supply from your consumer unit.
Can I pour water on the stones?
Yes. Both heaters hold stones. A ladle of water on the hot stones makes a burst of soft steam, called löyly.
Does it need planning permission?
Garden buildings under 2.5 m tall near a boundary usually don't, and the Cube is 225 cm tall. Rules vary, so check with your local council.
Which way does the door open?
Outwards, as a sauna door should, so it is always easy to get out.
Full specifications
Everything about the Outdoor Living Cube sauna in one place.
Size and weight
- Outside
- L 235 × W 220 × H 225 cm
- Door
- 46 × 173 cm
- Benches
- Left 73 × 199 cm, back 73 × 155 cm
- Built weight
- About 850 kg
- Capacity
- Up to 5 people
Build
- Walls
- 36 to 38 mm spruce
- Frame
- Steel hoops
- Roof
- Red-brown asphalt shingles over a waterproof membrane
- Front
- Glass door between two glass panels
Heater and power
- Heater
- Harvia, chosen above
- Options
- The Wall 9 kW with Fenix Wi-Fi, or Cilindro 6.8 kW with dials
- Supply
- Hard-wired, 230 V, by an electrician
Space
- Clearance
- At least 5 cm round the sides and 30 cm above
- Base
- Firm, level concrete or paving
- Assembly
- 4 people
Warranty
- Sauna
- 1 year from Outdoor Living
- Heater
- Covered by Harvia
Sizes, weight and bench layout are from the Outdoor Living manual and drawing. Running costs are estimates.