France Sauna Zen 3: 3 Person Indoor Sauna
One configuration, and the heater, its stones and the bucket are all in the price.
£2,014.00
Harvia heater inside
- 3.5kW Harvia Vega heater, its stones and the sauna kit included
- 16A single phase supply
- Delivery confirmed before dispatch
- Cabin
- Canadian spruce, 1,530mm wide, 1,100mm deep and 1,900mm tall
- Inside
- One bench for three with a headrest on the wall
- Heater
- Harvia Vega 3.5kW with its stones, controlled by switches on the heater
- Glass
- An 8mm toughened glass door with a glass panel either side
- Lighting
- Soft light in the top corner and under the bench
- Kit
- Wooden bucket and ladle, thermometer, hygrometer and sand timer
- Electrics
- 16A single phase, wired and certified by an electrician
A Finnish room for three in 1.53 by 1.1 metres, on the same 16 amp circuit as the two seater. 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, 186kg 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 3 is a 1,530mm by 1,100mm cabin, 1,900mm tall, built in Canadian spruce with an 8mm toughened glass door and a glass panel either side of it. One bench with a headrest on the wall, 1.5 metres long, seating three. Soft lighting sits in the top corner and under the bench.
It is a traditional electric sauna rather than an infrared one: a 3.5kW Harvia Vega heater with its stones is in the price, along with the wooden bucket and ladle, the thermometer and hygrometer and the sand timer. Water on the stones gives the burst of steam a Finnish sauna is known for.
The heater needs its own circuit, fitted by an electrician. Harvia rate the 3.5kW Vega at 16A on a 230V single phase supply in 2.5mm² cable. 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.
Stones, steam and a ladle, in 1.53 by 1.1 metres. The bench is 1.5 metres long, so three sit comfortably or two sit with space. The 3.5kW Harvia heater draws about 15 amps at 230 volts, so it needs a 16 amp circuit of its own, which is an afternoon for an electrician rather than a conversation with the network operator.
Worth confirmingyou want a second tier to sit higher, or room to lie down. One bench, one level. The Zen 3C and Zen 4 in the same range have two tiers, and we would rather point you at one of them.
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 £2,014, 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 is the one to respect. The finished cabin is 1.9 metres tall, but the wall panels are tipped upright during assembly and there has to be room above them to do it. Measure where the cabin will actually stand, not at the door.
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 16A 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 97p
Heat up: 3.5kW for 40 minutes is 2.3 kWh, for a room of about 3.2 cubic metres. Holding: 1 hour at roughly 40% duty is 1.4 kWh. Total 3.7 kWh at 26.32p is about 97p.
about £101
104 sessions at 97p. 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 3.5kW Vega takes 12kg. 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 3.5kW, not measured on an installed cabin. Heat up is taken as 40 minutes, our working figure for a room of about 3.2 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 3.5kW draws about 15A at 230V. Harvia publish the 3.5kW Vega as 230V single phase on a 16A fuse with 3 x 2.5mm2 cable, or 400V two phase at 2 x 10A with 4 x 1.5mm2. 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 3.5kW Vega is 230V single phase on 16A with 3 x 2.5mm2 cable, takes 12kg of stones, and is rated for rooms of 2 to 4.5 cubic metresHarvia, Vega Compact BC35 product data
- Zen 3 is 153 x 110 x 190cm, 186kg, Canadian spruce, 8mm glass door, seats three, 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 3.5kW 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 8mm toughened glass door and the glass panels either side of it
- The bench for three, the headrest on the wall, the top corner light and the light under the bench
- The Harvia Vega 3.5kW heater with its 12kg 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 16A 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.
One bench, 1.5 metres long, one level. The Zen 3C and Zen 4 in the same range have two tiers, and we would rather sell you one of those than watch someone perch on the floor.
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 3.5kW Vega. The 15A current is our own arithmetic from the rated output.
- 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.
IndoorFrance Sauna Zen 2: 2 Person Indoor Sauna
£1,802.00- 2 people, 120 × 110 × 190cm
- Canadian spruce
- 3.5kW Harvia heater included
IndoorFrance 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
IndoorFrance Sauna Zen 4: 4 Person Indoor Sauna
£2,650.00- 4 people, 198 × 174 × 200cm
- Canadian spruce, two tiers
- 6kW 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.