Indoor Saunas
Cabins for a spare room, a garage or a loft. The questions that decide it are the ceiling height, the room you can give it, and whether your supply can carry the heater.
Harvia Family Hybrid Small: Infrared and Traditional Indoor Sauna
£6,395.00- 1.66m × 1.59m
- 3.6kW
- 350W infrared
Holl's Combi 2: Hybrid Infrared and Traditional Sauna, 2 Person
£3,795.00- 2 people, 140 × 130 × 190cm
- Infrared and traditional
- 3.5kW Harvia heater included
Holl's Utopia 4: 4 Person Indoor Sauna
£5,995.00- 4 people, 200 × 145 × 196cm
- Hemlock, full glass front
- 6kW heater included
Holl's Eccolo 6: 6 Person Indoor Sauna
£4,695.00- 6 people, 200 × 175 × 190cm
- Insulated walls, two tiers
- 4.5kW Harvia heater included
Holl's Canopée 6: 6 Person Infrared Sauna
£5,495.00- 6 people, 185 × 185 × 190cm
- Hemlock, slatted lining
- 4,000W quartz, magnesium and carbon
Holl's Canopée 3C: Corner Infrared Sauna, 3 to 4 Person
£4,995.00- 3 to 4 people, 160 × 160 × 190cm corner
- Hemlock, slatted lining
- 2,600W quartz, magnesium and carbon
Holl's Canopée 2: 2 Person Infrared Sauna
£4,295.00- 2 people, 140 × 125 × 190cm
- Hemlock, slatted lining
- 2,150W quartz, magnesium and carbon
Holl's Moon 4: 4 Person Infrared Sauna
£5,195.00- 4 seats
- 180cm diameter × 196cm tall
- 4,620W full spectrum
Holl's Moon 1: 1 Person Infrared Sauna
£3,195.00- 1 seat
- 102cm diameter × 196cm tall
- 1,970W full spectrum
France Sauna Apollon 3C: Corner Infrared Sauna
£2,438.00- 3 to 4 people, 150 × 150 × 190cm corner
- 8 quartz emitters and carbon floor
- 3,180W
France Sauna Apollon 3: 3 Person Infrared Sauna
£2,278.00- 3 people, 153 × 128 × 190cm
- 6 quartz emitters and carbon floor
- 2,825W
France Sauna Apollon 2: 2 Person Infrared Sauna
£1,907.00- 2 people, 120 × 123 × 190cm
- 5 quartz emitters and carbon floor
- 1,880W
France Sauna Zen 4: 4 Person Indoor Sauna
£2,650.00- 4 people, 198 × 174 × 200cm
- Canadian spruce, two tiers
- 6kW Harvia heater included
France Sauna Zen 3: 3 Person Indoor Sauna
£2,014.00- 3 people, 153 × 110 × 190cm
- Canadian spruce
- 3.5kW Harvia heater included
France Sauna Zen 3C: Corner Sauna, 3 to 4 Person
£2,279.00- 3 to 4 people, 150 × 150 × 200cm corner
- Canadian spruce
- 4.5kW Harvia heater included
France Sauna Zen 2: 2 Person Indoor Sauna
£1,802.00- 2 people, 120 × 110 × 190cm
- Canadian spruce
- 3.5kW Harvia heater included
Holl's Moon 2: 2 Person Infrared Sauna
£3,995.00- 2 people, 130cm diameter × 196cm tall
- Quartz full spectrum and carbon
- 2,305W
Harvia Variant View: Glass Front Indoor Sauna
From £4,895.00- Six sizes
- 2.02m external height
- spruce walls, aspen benches
- heater and accessory kit included
Harvia Panorama: 4 to 5 Person Indoor Sauna
From £5,750.00- 4 to 5 people
- 4.5 to 9.2m³
- heater and lighting included
Harvia Onni Infrared Sauna: One or Two Person
From £3,995.00- One or two seats
- 1400W or 1800W
- plugs in
Introduced gradually. A cabin appears here once we can tell you what it draws, how long it holds temperature with the door being opened, and who supplies a replacement element in year six.
How a sauna earns its placeThe window is the reason the heater is too small.
Saunas are sold on two numbers: how many people fit, and how many kilowatts the heater is rated at. Both are printed on every listing, and together they leave out the thing that decides whether the cabin gets hot.
The sizing rule itself is not secret. Harvia, who have been making heaters since 1950, publish it plainly: roughly one kilowatt of heater for every cubic metre of cabin. The part that gets left off is the correction that follows it. One square metre of glass, stone or any other uninsulated surface raises the requirement as much as adding 1.2 cubic metres of room. Uninsulated log walls carry a factor of 1.5.
So the panoramic window, which is the feature that sells a garden sauna and the reason anybody wants one at the bottom of the garden, is also the feature that quietly makes the specified heater undersized. Two square metres of glass on a nine cubic metre cabin is not a nine kilowatt requirement. It is closer to eleven. Cabins are routinely sold with the smaller number.
None of this is specialist knowledge. It is arithmetic anybody can do once somebody hands them the rule. We did not make these and we do not own a factory, which is what makes handing it over straightforward. Every sauna goes through the same three gates.
Three gates. All three, or it is not here.
The same three, in the same order. Most things stop at the second.
What the cabin is built from, how the heat is made, what it draws, and which component gives out first. If we cannot work out the heater requirement for your room from the dimensions and the glazing, we do not understand the product well enough to sell it.
Against a British garden in February rather than a heated indoor showroom. A heat-up time is a measurement taken somewhere, under conditions nobody states. Most products stop here, and usually not because they are bad. It is because the figure was never taken in the conditions you will use it in.
Warranty terms in writing, elements and controllers held in this country, and clarity about who commissions the electrical supply. The room containing a sauna heater is a special location under the Building Regulations, which changes who is allowed to do the work. Nothing reaches this page until somebody is on the hook for year six.
Five things that decide whether a sauna is worth owning.
None of them is how many people it seats.
- Whether the heater matches the room it is actually in. One kilowatt per cubic metre, then add 1.2 cubic metres for every square metre of glass or stone. We publish the corrected figure for the cabin as configured, not the rating on the box.
- Whether it holds the heat or only reaches it. Reaching temperature is a function of the heater. Staying there while a door opens on a wet evening is a function of the insulation, and it is the difference between a session and a wait. A six kilowatt cabin uses about four to five units getting hot and three to four holding it, so the second hour tells you more than the first.
- Which kind of heat you are buying. A traditional sauna runs at 80 to 100 degrees in dry air. An infrared cabin runs at 45 to 60. They share a safety standard and almost nothing else, and the long-running research sits on the hot one. We say which is which rather than letting the word cover both.
- What it asks of the house. A six kilowatt heater draws around 26 amps at 230 volts, which is well past a 13 amp plug, so it is a dedicated circuit and a certificate. A wood-fired stove asks for different things: a carbon monoxide alarm, a flue swept twice a year, and fuel that carries the Ready to Burn mark.
- Whether it is allowed where you want to put it. Within two metres of a boundary an outbuilding is capped at 2.5 metres tall, and a barrel or apex roof clears that easily. Wood-fired adds a second question, because a chimney on a garden building falls inside smoke control rules where they apply.
What to read before you shortlist anything.
The running cost gap, the smoke control rules, and the forty minutes before you get in. Written so you can rule one out.
02 Whether your space worksSeven questions on access, ground and height. It will tell you plainly when a garden sauna is the wrong answer.
03 The Tarnfell PrinciplesFive commitments governing what we list, what we write and who we work with. Public, so you can hold us to them.
04 Delivery, warranty and returnsWhat happens after the money changes hands, written down before it does.
We write this down as we go.
The buying guides as they are written, the comparisons once there is something to compare, and the reasoning whenever a sauna passes the gates or fails them. Occasional, and worth the room in an inbox.