France Sauna Zen 4: 4 Person Indoor Sauna
One configuration, and the heater, its stones and the bucket are all in the price.
£2,650.00
Harvia heater inside
- 6kW Harvia Vega heater, 20kg of stones and the sauna kit included
- 35A single phase supply, or three phase
- Delivery confirmed before dispatch
- Cabin
- Canadian spruce, 1,980mm wide, 1,740mm deep and 2,000mm tall
- Inside
- Two tiers of bench along the back and side, with headrests
- Heater
- Harvia Vega 6kW with its stones, controlled by switches on the heater
- Glass
- A 4mm glass door in a wooden frame, with glass panels either side
- Lighting
- Soft light in the top corner and under the bench
- Kit
- Wooden bucket and ladle, thermometer, hygrometer and sand timer
- Electrics
- 35A single phase, wired and certified by an electrician
The largest Zen. Two full tiers for four in a 2 by 1.74 metre cabin, with a 6kW Harvia heater on a 35 amp circuit. Nothing to configure, and the heater is not an extra.
Delivery & installation
Delivery is included in the price, kerbside to mainland Britain: England, Wales and mainland Scotland. The Scottish Highlands, islands and any address a lorry cannot reach are quoted in writing before dispatch, and if the figure does not suit you, cancel for a full refund. Northern Ireland: write to us before ordering. Nothing is added at checkout.
The cabin arrives flat, as wall, roof and glass panels with the benches, heater and kit boxed separately, 232kg in total on the maker's figure.
If you would rather not build it yourself, we can introduce you to an independent installer near you, typically from £650, paid to them directly. Once you place your order we confirm your delivery date, and if you want an installer we introduce you to an independent one near you.
Warranty
Seven years on the wood structure and two years on the electrical components, which are the terms France Sauna publish for the Zen range in its specification sheet.
The UK distributor administers the warranty and raises claims with the maker where needed. The cabin is sold for home use: the distributor does not supply it for commercial use, and commercial or very frequent use can affect cover.
Claims come to us. One email, and we deal with the distributor and the maker on your behalf rather than handing you a phone number.
Returns
Until the order is placed with the supplier you can cancel and be refunded in full, with no reason needed.
After that the cabin is on its way from the distributor, and our returns policy sets out exactly where that leaves you. Check the packages against the parts list on the day they arrive and tell us about anything damaged or missing within 48 hours; anything that arrives damaged or faulty is ours to put right either way.
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About this product
The Zen 4 is the largest cabin in the range: 1,980mm wide, 1,740mm deep and 2,000mm tall, in Canadian spruce, with a 4mm glass door in a wooden frame and glass panels either side. Two tiers of bench with headrests seat four adults without touching, the upper tier where the heat is and the lower for those who want it gentler. Soft lighting in the top corner and under the bench.
It is a traditional electric sauna rather than an infrared one: a 6kW Harvia Vega heater with 20kg of stones is in the price, along with the wooden bucket and ladle, the thermometer and hygrometer and the sand timer.
The heater needs its own circuit, fitted by an electrician, and this is the one cabin in the range that asks a real question of your consumer unit: Harvia specify a 35A fuse for the 6kW Vega on a 230V single phase supply, or 3 × 10A on three phase. Everything else about it is fixed, so there is nothing to configure.
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- Your details stay privateCard details are never stored on a Tarnfell system.
- Payment on confirmationWe take payment only once your order is confirmed.
- 14 day cancellation rightsCancel within 14 days of delivery, under the Consumer Contracts Regulations 2013.
Who this is actually for.
Every product here is described with the honest opposite beside it: who it suits, and who should be looking at something else. If none of the descriptions below fits you, the right answer is elsewhere in the range, or elsewhere entirely, and we would rather say so.
Two tiers: the upper bench is where the heat is, the lower one is for those who want it gentler, and four adults sit without touching. At 6kW the Harvia heater draws about 26 amps at 230 volts, and Harvia specify a 35 amp fuse for it, so this is the one cabin in the range that asks a real question of your consumer unit before you order.
Worth confirmingyou have a small room or a modest supply. Nearly 2 metres wide and 1.74 deep, it wants a room to itself, and a 35 amp circuit is not always available without work at the board. The Zen 3C does three to four on 20 amps in a corner.
Most cabins at this size are sold bare and the heater is added at the checkout. Here the Harvia Vega, its stones, the bucket, the ladle, the thermometer and the sand timer are all in the £2,650, so the figure on this page is the figure you pay for a working sauna, before delivery and the electrician.
Worth confirmingyou want WiFi, a schedule or an app. The Vega is controlled by two switches on the heater itself, a timer and a thermostat, and that is all. It is simple, which is a virtue, but it will not warm up while you drive home.
The product that gets used is the one worth recommending, and it is not always the largest one.
The measurements that decide it.
Read this before anything else. An indoor cabin is almost never sent back because it was the wrong product; it is sent back because it would not go up the stairs or stand up in the room.
The ceiling and the supply are the two to respect. The finished cabin is 2 metres tall and the wall panels are tipped upright during assembly, so there has to be room above them. And Harvia specify a 35 amp fuse for the 6kW heater on single phase, which an electrician should confirm your board can give before you order, not after.
From order to first use.
Here is each stage, and who does what. Delivery is estimated at 10 to 14 working days from order. If you would rather have stock, the date or anything else settled first, email hello@tarnfell.com before you order and we will confirm it in writing.
- Week 0
Order and room check
Ceiling height, floor, access and your consumer unit are agreed before the order is placed with the distributor. There is nothing to configure on the cabin itself.
- Before it arrives
The circuit
An electrician runs a 35A single phase circuit to the corner where the heater will hang and leaves it ready to terminate. A room containing a sauna heater is notifiable work, so this is not a job for a competent friend.
- Delivery day
To the door, in panels
The cabin arrives flat as wall, roof and glass panels with the benches, heater and kit boxed. Check everything against the parts list the day it lands, which is the easy time to find out.
- Build day
Two people, working from the manual
Wall panels up, glass in, roof on, benches and heater guard fitted. If you would rather hand it over, we introduce you to an independent installer near you once you have ordered.
- Before first use
The electrician returns
The heater is hung, connected and the circuit tested and certified. You should be handed a certificate. Then the stones go in, loosely, and the first heat cycle burns off the factory smell with the door open.
What owning one actually involves.
The handful of things that decide whether this is still in use in year three.
The Harvia Vega is controlled by a timer and a thermostat on the heater itself. Set both, wait for the stones to come up, and throw water when you want steam. There is no app and nothing to pair, which is either the point or the problem, depending on who you are.
Spruce carries pitch pockets that cannot be seen when the boards are sorted. If one is near the surface, heat softens it and it weeps. Acetone on a rag takes it off, or let it harden and scrape it. Worth knowing before it happens rather than after.
An unheated timber room in a house that breathes is where mould starts, and one cycle a month prevents it. This is Harvia's standing advice for any cabin left idle.
Nothing else inside. Bare timber in a sauna is meant to stay bare, and detergents leave a film that bakes.
The running costs, with the working shown.
The purchase price is public; the running cost rarely is. Ours are published with the assumptions stated, so you can check the arithmetic and change it for your own tariff.
about £1.82
Heat up: 6kW for 45 minutes is 4.5 kWh, for a room of about 6.9 cubic metres. Holding: 1 hour at roughly 40% duty is 2.4 kWh. Total 6.9 kWh at 26.32p is about £1.82.
about £189
104 sessions at £1.82. For comparison, the same arithmetic on an 8kW outdoor barrel comes to about £383, and that is before the weather gets involved.
a few pounds, every few years
Sauna stones crack and crumble with use and are restacked yearly and replaced when they do. Harvia's 6kW Vega takes 20kg. They are the only consumable part.
Assumptions: electricity at the Ofgem price cap unit rate of 26.32p per kWh, 1 October to 31 December 2026, with no VAT on household electricity in that period. Figures are calculated from the heater's rated output of 6kW, not measured on an installed cabin. Heat up is taken as 45 minutes, our working figure for a room of about 6.9 cubic metres indoors, and it says so here rather than being presented as theirs. An indoor cabin in a heated house loses far less than an outdoor one, so these sums are closer to the truth than the same sums on a garden sauna.
What you have to do, and what the rules require.
Everything you have to do, and how often.
| Job | How often | Who |
|---|---|---|
| Install and certify the circuit 6kW draws about 26A at 230V. Harvia publish the 6kW Vega as 230V single phase on a 35A fuse, or 400V three phase at 3 x 10A with 5 x 1.5mm2 cable. Cable size for the single phase run is for your electrician to specify. A room containing a sauna heater is notifiable electrical work in England and Wales. | Once, before first use | A qualified electrician |
| Restack and inspect the stones Lift them out, discard any that are cracked or crumbling, and restack loosely so air moves between them. Tightly packed or broken stones make the elements work harder. | Yearly | You |
| Heat it even when you are not using it One heating cycle a month if the cabin is out of use for a while, to keep mould from forming in the timber. | Monthly when idle | You |
| Air it after use Leave the door open until the room is dry. Trapped damp is what marks benches, not heat. | Every session | You |
| Wipe the benches down A damp cloth and warm water only. Nothing film forming. | Monthly, or after heavy use | You |
| Deal with resin if it appears Pitch pockets occur in spruce and cannot be seen during sorting. Leaking pitch comes off with acetone on a rag, or leave droplets to harden and scrape them carefully. | As it happens | You |
Where this comes from.
Regulation and guidance, linked so you can read it yourself. None of it is our opinion.
- A room containing a sauna heater is notifiable electrical workApproved Document P, 2013 edition
- A sauna heater must not be protected by a residual current device, while other circuits in the room must beBS 7671 regulation 703.412.5
- The 6kW Vega is 230V single phase on a 35A fuse or 400V three phase on 3 x 10A, takes 20kg of stones, and is rated for rooms of 5 to 8 cubic metresHarvia, Vega BC60 product data
- Zen 4 is 198 x 174 x 200cm, 232kg, Canadian spruce, 4mm glass door in a wooden frame, seats four, supplied with a Harvia heater and the sauna kit, seven year wood and two year electronics warrantyFrance Sauna Zen specification sheet, March 2023 edition
- Electricity unit rate of 26.32p per kWh, 1 October to 31 December 2026Ofgem energy price cap
Every figure the makers publish.
- Warranty
- 7 year wood, 2 year electrical warranty
- Lead time
- Estimated 10 to 14 working days from order. We confirm stock and your delivery date in writing when we process your order.
Cabin figures are from France Sauna's own specification sheet for the Zen range, March 2023 edition. Heater figures are from Harvia's published data for the 6kW Vega. Where a figure is ours rather than theirs, it says so.
What arrives, and what does not.
- The cabin as spruce panels, with the framed glass door and the glass panels either side of it
- Both tiers of bench, the headrests, the top corner light and the light under the bench
- The Harvia Vega 6kW heater with its 20kg of stones
- The sauna kit: wooden bucket and ladle, thermometer, hygrometer and sand timer
- Seven years of the maker's warranty on the wood and two on the electronics
- The electrical work. A 35A circuit, run, terminated and certified by an electrician
- Assembly, unless you ask us to arrange it
- Any building work to the room itself, including flooring and ventilation
- Delivery to the Scottish Highlands, islands and hard to reach addresses, which is quoted before dispatch
Reasons to buy something else.
Harvia's fuse rating for the 6kW Vega on single phase is 35 amps. Some boards will take that without fuss and some will not, and an electrician's answer before you order is worth more than ours after. The Zen 3C needs 20 amps and seats nearly as many.
The heater will not run from a socket. If a dedicated circuit is not possible where the cabin would stand, an infrared cabin on a lighter supply is the honest alternative, and the Apollon range is built for exactly that.
Two switches on the heater, a timer and a thermostat, and nothing beyond them. It is simple by design. If you want the sauna warm when you walk in from the car, this is not the cabin that does it.
A timber cabin wants a dry room with air moving through it. A sauna does not fix a cellar; it makes the problem worse and puts spruce in the middle of it.
If any of these apply, say so and we will point you at what does suit you, including when that is a cheaper product or one we do not sell.
What we know, and how we know it.
Where every figure on this page comes from, with the source beside it.
- Dimensions, construction, weight and contents
-
Verified
Size, timber, glass, weight, the benches, the lighting and the contents of the kit are taken from France Sauna's own specification sheet for the Zen range, March 2023 edition, and match the UK distributor's listing.
- Heater and electrical supply
-
Verified
Output, fuse rating, stone quantity and room rating are Harvia's published data for the 6kW Vega. The 26A current is our own arithmetic from the rated output.
- Heater height rating
-
Verified
Harvia's data for the 6kW Vega lists a minimum room height of 2 metres and the Zen 4 stands 2 metres tall outside. The pairing is the maker's, and the 5 to 8 cubic metre rating covers this 6.9 cubic metre cabin.
- Warranty administration
Seven years on the wood and two on the electronics are the maker's published terms. Claims run through the UK distributor, which raises them with the maker where needed, and you deal only with us. The cabin is sold for home use: the distributor does not supply it for commercial use, and commercial or very frequent use can affect cover.
The three closest to it.
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 3: 3 Person Indoor Sauna
£2,014.00- 3 people, 153 × 110 × 190cm
- Canadian spruce
- 3.5kW 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
Weighing this against another sauna? Let us do the homework.
Choosing between two saunas takes evenings of research, so let us carry it. Name the other one you are considering and we will send a straight comparison, including where the other one wins.