Harvia Cilindro 9kW Black
Fenix touch panel on the wall, plus the MyHarvia app to warm it up from your phone
- Power
- 9 kW
- Stones
- 90 kg
- Supply
- 40 A, 230 V hard-wired
£2.96a session
£38a month
Hekla Cube 160 - 2 Person Outdoor Sauna
Model: HEKLAC160
Regular price £7,599.00
Unit price ⓘ Unit price based on the product measurement shown.
Hekla
A Finnish sauna for two, with the garden in view
The Hekla Cube 160 is a compact outdoor sauna with a full glass front, a heat-treated spruce shell and room for two on smooth aspen benches. Light comes in, the heat stays in, and it lives outside all year round.
2people
9 kWrecommended heater
45minutes to heat up
- 1Full glass front and 8 mm doorDouble-glazed, tempered glass
- 2Rear panelHalf panoramic window or full timber
- 3Roof shinglesBitumen shingles over an underlay
- 4LED bench lightingBuilt in, with a switch
- 540 mm thermo-spruce shellHeat-treated for rain and frost
- 6Steel bandsTwo bands hold the staves tight
- 7Three foundation beamsLift the shell off the base
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Glass front, garden view
A double-glazed glass front and an 8 mm tempered glass door keep the garden in sight while you sit in the heat.
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Thermo-spruce that stays stable
The 40 mm shell is heat-treated spruce, which Hekla uses so it stays stable through rain and frost. It weathers naturally, with no painting needed.
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Choose your rear panel
Pick a half panoramic window for light from both sides, or a full timber back for more privacy.
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Smooth, resin-free benches
The benches, backrest and duckboard floor are thermo-aspen: smooth, splinter-free and resin-free, so they are comfortable on bare skin.
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Harvia heat, your way
Choose a Harvia Cilindro: 6.8 kW or 9 kW with simple dials, or 9 kW in black with the Fenix Wi-Fi panel so you can warm it up from your phone.
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Ready for evenings
LED lighting built into the benches and a ventilation valve make after-dark sessions calm, with fresh air coming through.
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 for two 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 160 needs from your garden
It is a small building, 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. The sauna sits on three supplied beams and can weigh up to about 600 kg once built, plus the people inside. Don't stand it on grass or soil.
Space around it
Plan for 234 × 169 cm including the roof overhang, and leave room to walk round it for maintenance. We suggest at least 50 cm. At 237 cm tall it is under the usual 2.5 m height limit for garden buildings near a boundary, but check with your local council.
A dedicated electric supply
The heater is hard-wired, not plugged in. A qualified electrician runs a dedicated supply from your consumer unit: 35 A for the 6.8 kW heater or 40 A for a 9 kW heater, on a standard 230 V supply.
225 × 169 × 235 cmWidth, depth and height
234 × 169 cmBase to plan for, with the roof
217 × 157 × 221 cmInside
Up to 600 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 Cube 160 is built
Shell
40 mm heat-treated spruce.
Heat treatment changes the wood so it takes in less water and moves less. Hekla uses it so the shell stays stable through rain and frost, and it weathers naturally without paint.
What to watch for elsewhere
Untreated softwood.
Plain spruce or pine soaks up rain, swells and shrinks, and needs regular treatment to stop it cracking.
How the Cube 160 is built
Shape
Interlocking staves, held by steel bands.
Each curved stave locks into the next with a ball-and-socket edge, and two steel bands pull the shell tight, so the curve keeps its shape as the timber settles.
What to watch for elsewhere
Screwed flat panels.
Flat boards rely on screws and joints, which can open up as the timber moves with the seasons.
How the Cube 160 is built
Glass
Double-glazed front and an 8 mm tempered door.
Two panes with a gap between them keep more heat in than one, and tempered safety glass is made for sauna temperatures.
What to watch for elsewhere
Single, thin glass.
A single pane lets heat out quickly, so the room takes longer to warm up and costs more to run.
How the Cube 160 is built
Roof
Bitumen shingles over an underlay.
Overlapping shingles shed rain and snow off the curved roof, with an underlay underneath as a second barrier.
What to watch for elsewhere
Bare timber on top.
Without a proper covering, the top of the sauna takes the full force of the weather.
How the Cube 160 is built
Benches
Thermo-aspen inside.
Aspen is smooth, splinter-free and resin-free, so the benches, backrest and floor are comfortable on bare skin.
What to watch for elsewhere
Resinous softwood benches.
Some softwoods can weep sticky resin in the heat and get rough over time.
Your heater and what it costs to run
Every Cube 160 comes with a Harvia Cilindro heater. Glass loses more heat than timber, so we recommend a 9 kW heater for the glass-fronted Cube. 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
Harvia Cilindro 9kW
Dials on the heater for heat and timer
- Power
- 9 kW
- Stones
- 80 kg
- Supply
- 40 A, 230 V hard-wired
£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 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 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 Cube 160 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 two thermo-aspen benches with a backrest.
How long does it take to heat up?
About 30 to 45 minutes to reach full bathing heat, depending on the heater and the weather outside.
How hot does it get?
Most people enjoy 70 to 90°C. With the Fenix Wi-Fi heater you set the exact temperature on the panel or in the MyHarvia app.
Can I pour water on the stones?
Yes. Harvia Cilindro heaters are made for it. A ladle of water on the hot stones 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 needs to connect it to its own supply from your consumer unit.
Can I warm it up from my phone?
Yes, with the black Cilindro 9 kW heater and its Fenix Wi-Fi panel. You can switch it on and set the temperature in the MyHarvia app.
Does it need planning permission?
Garden buildings under 2.5 m tall near a boundary usually don't, and the Cube 160 is 237 cm tall. Rules vary, so check with your local council, especially for listed buildings or conservation areas.
Can it stay outside all winter?
Yes, it is built to stand outside all year. In heavy rain a little water can seep into the staves; this is normal for a timber sauna and dries out when you use it.
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 Cube 160 in one place.
Size and weight
- Outside
- W 225 × D 169 × H 235 cm
- Base to plan for
- 233.5 × 169 cm, 236.8 cm tall with the roof
- Inside
- About 217 × 157 × 221 cm
- Built weight
- Up to about 600 kg
- Capacity
- 2 people
Build
- Shell
- 40 mm thermo-spruce staves
- Roof
- Bitumen shingles over an underlay
- Bands
- 2 steel bands
- Foundation
- 3 foundation beams
- Benches and floor
- Thermo-aspen benches, backrest and duckboard floor
Glass
- Front
- Double-glazed full glass front
- Door
- 8 mm tempered grey glass
- Rear panel
- Half panoramic double-glazed window or full timber
Inside
- Seating
- 2 benches with a backrest
- Lighting
- Integrated LED bench lighting with a switch
- Ventilation
- Ventilation valve
Heater and power
- Heater
- Harvia Cilindro, chosen above
- Options
- 6.8 kW, 9 kW, or 9 kW black with Fenix Wi-Fi
- Stones
- 80 to 90 kg, depending on heater
- Supply
- Hard-wired, 230 V: 35 A (6.8 kW) or 40 A (9 kW)
Finish and warranty
- Finish
- Scandi (natural) or Nero (black)
- Warranty
- 2 years from Hekla
- Certification
- ETL listed and CE marked
Sizes and weights are from Hekla's spec sheet, drawing and manual. The bench layout in our plan follows Hekla's drawing. Running costs are estimates.