Harvia The Wall 6kW
Fenix touch panel on the wall, plus the MyHarvia app to warm it up from your phone
- Power
- 6 kW
- Stones
- 20 kg
- Supply
- 40 A, 230 V hard-wired
£1.97a session
£26a month
Hekla Mini Cube - 2 Person Outdoor Sauna
Model: HEKLACMINI
Regular price £5,899.00
Unit price ⓘ Unit price based on the product measurement shown.
Hekla
A small garden sauna for two, with a glass door
The Hekla Mini Cube fits a proper Finnish sauna for two into a footprint of about 1.3 by 1.5 metres. A thermo-spruce shell, a glass front and a two-step aspen bench, heated by a slim Harvia heater on the wall.
2people
133 × 153cm footprint
Appheater control
- 18 mm glass doorGrey tempered glass
- 2Fixed glass side panelsLight from the front
- 3Roof shinglesBitumen shingles
- 4Steel bandsHold the staves tight
- 5Thermo-spruce shellHeat-treated for rain and frost
- 6Timber bearersLift it off the base
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Small footprint
At about 133 × 153 cm it fits a patio, a corner of the lawn or the end of a decked area.
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Glass front
An 8 mm grey tempered glass door with fixed glass either side lets the light in and keeps the garden in view.
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A bench for two, and a step
A wide upper bench runs across the back, with a lower bench in front to rest your feet or sit lower down.
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Harvia The Wall heater
A slim wall-hung heater with the Fenix Wi-Fi panel, so you can set the heat on the wall or warm it up from your phone. Choose 6 kW or 9 kW.
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Thermo-spruce shell
Heat-treated spruce staves, held by steel bands, under a bitumen shingle roof.
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Soft LED light
A remote-controlled LED strip gives gentle light for evening sessions.
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 Mini Cube needs from your garden
It is small, but it is still a building with a heater inside, so plan the base, the space around it and the power before it arrives.
A firm, level base
A concrete slab or a pile foundation that lets rain drain away. Hekla says it weighs up to about 300 to 400 kg built, plus the people inside. Don't stand it on grass or soil.
Space around it
Plan for about 134 × 153 cm, and leave room to walk round it. We suggest at least 50 cm. At about 222 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
The Wall heater is hard-wired by a qualified electrician on its own supply from your consumer unit, on a standard 230 V supply.
133.5 × 153 × 222 cmWidth, depth and height
125 × 52 cmUpper bench
2 peopleSeats
300 to 400 kgBuilt weight, before people
Built for a British garden
What is in the walls, the glass and the roof, and why it matters when it lives outside all year.
How the Mini Cube is built
Shell
Heat-treated spruce.
Heat treatment changes the wood so it takes in less water and moves less, so the shell stays stable through rain and frost.
What to watch for elsewhere
Untreated softwood.
Plain spruce or pine soaks up rain, swells and shrinks, and needs regular treatment.
How the Mini Cube is built
Shape
Interlocking staves, held by steel bands.
The rounded staves lock together and steel bands pull them tight, so the shell keeps its shape.
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 Mini Cube is built
Glass
An 8 mm tempered glass door.
Grey tempered safety glass, made for sauna heat, with fixed glass either side.
What to watch for elsewhere
A solid door.
A small sauna with a solid door can feel dark and boxed in.
How the Mini Cube is built
Roof
Bitumen shingles.
Overlapping shingles shed rain and snow off the curved top.
What to watch for elsewhere
Bare timber on top.
Without a covering, the top takes the full force of the weather.
Your heater and what it costs to run
The Mini Cube uses Harvia The Wall, a slim heater that hangs on the wall to save space, with the Fenix Wi-Fi panel. Pick 6 kW or 9 kW above and the figures here follow your choice.
Recommended
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
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 about 30 to 40 minutes before. Most people enjoy 70 to 90°C. Take a quick shower first.
- Sit in the heat
Stay 8 to 15 minutes. Sit higher for more heat, lower for less. 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 2-year Hekla warranty
Covered by the brand, backed by our team.
Your Mini Cube comes with Hekla's 2-year warranty, and your Harvia heater is covered by Harvia. If anything goes wrong, call us first and we'll sort it out with the maker for you.
Brand warranty
Help from our UK team
Easy to look after
A few simple habits keep it looking good and smelling fresh.
Sit on a towel
It keeps the benches clean and stops sweat marks soaking into the wood.
Let it dry out
After a session, leave the door ajar for a while so the inside dries. Don't use cleaning products inside.
Check the stones
Re-stack the heater stones once a year and replace any that have crumbled, so the heat and steam stay even.
Let the outside weather
The thermo-spruce turns a silvery grey over time. That is normal. In heavy rain a little water can seep into the staves; it dries out when you heat the sauna.
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
Hekla saunas come direct from the maker. Here is how it gets to your garden.
Order online
Choose your finish, rear panel and 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 on a pallet at the nearest accessible point outside your property. The manual takes you through the build. It is a job for two people.
Delivery and installation
We build it for you£899Our installers deliver the sauna, build it on your prepared base and connect the heater. Just have the base ready.
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?
Two adults, on the upper bench, with a lower bench in front for your feet.
6 kW or 9 kW?
Both work. 6 kW costs less to buy and run; 9 kW warms it up faster and holds the heat better on cold days.
Can I warm it up from my phone?
Yes. Both heaters come with the Fenix Wi-Fi panel and the MyHarvia app.
Can I pour water on the stones?
Yes. The Wall holds stones, and a ladle of water makes a burst of soft steam, called löyly.
Do I need an electrician?
Not if you choose delivery and installation: our team connects the heater for you. With flat-pack delivery, a qualified electrician connects it to its own supply.
Does it need planning permission?
Garden buildings under 2.5 m tall near a boundary usually don't, and the Mini Cube is about 222 cm tall. Rules vary, so check with your local council.
What is the difference between Scandi and Nero?
Scandi is natural thermo-spruce. Nero is the same sauna with a black finish outside. The inside is the same in both.
Full specifications
Everything about the Hekla Mini Cube in one place.
Size and weight
- Outside
- W 133.5 × D 153 × H 222 cm
- Benches
- Upper 125 × 52 cm, lower 74 × 31 cm
- Built weight
- About 300 to 400 kg
- Capacity
- 2 people
Build
- Shell
- Thermo-spruce staves
- Bands
- Steel bands
- Roof
- Bitumen shingles
- Base
- Timber foundation bearers
Glass
- Door
- 8 mm grey tempered glass
- Front
- Fixed glass either side of the door
Heater
- Heater
- Harvia The Wall with Fenix Wi-Fi, 6 kW or 9 kW
- Stones
- About 20 kg
- Supply
- Hard-wired, 230 V, by an electrician
Finish and warranty
- Finish
- Scandi (natural) or Nero (black)
- Warranty
- 2 years from Hekla
Sizes are from Hekla's spec sheet and drawing. The bench layout in our plan follows Hekla's drawing. Running costs are estimates.