Almost Heaven Princeton: 6 Person Barrel Sauna
The longest room of the four barrels, on a 50 amp circuit of its own.
£7,395.00
Harvia heater inside
- Harvia The Wall 8kW heater, its stones and an interior LED light included
- 50A single phase supply, against 40A for the 6kW barrel
- Kerbside delivery to mainland Britain included, date confirmed before dispatch
- Cabin
- Western red cedar staves, 1.83m across and 2.39m front to back
- Inside
- Two facing benches, 2.21m of room between the end walls, enough to lie down
- Heater
- Harvia The Wall, 8kW, controls built into the heater
- Also included
- Sauna stones and an interior LED light
- Electrics
- 50A single phase, wired and certified by an electrician
- Height
- 1.956m, under the 2.5m that permitted development allows near a boundary
- Delivery
- One pallet to the kerbside, delivery included to mainland Britain
This is the one to read if the Pinnacle looked right and then somebody asked whether anyone could lie down in it. Two feet longer, one heater size up, and the same electrical work.
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 sauna arrives as a kit on a pallet, delivered by lorry to the kerbside or the nearest firm, level spot the driver can reach. From there the parts move by hand: the staves, the two end walls with the door fitted, the benches and the boxed heater. Two people carry everything. The maker's own figure for the whole kit is about 415kg, which we have not yet weighed ourselves.
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
Two years on the barrel against manufacturing defects, and two years on the Harvia The Wall heater and its built in controls, under Harvia's published warranty terms. Registering the heater with Harvia adds a third year on it.
The UK distributor administers the warranty and raises claims with the maker where needed. 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. The cabin is sold for home use: commercial or very frequent use can affect cover.
What no sauna warranty covers, here or anywhere: timber moving, splitting slightly or greying outdoors, which is cedar behaving normally rather than failing; sauna stones, which are consumable; and damage from installation on a base that is not flat or not load bearing.
Returns
Until the order is placed with the supplier you can cancel and be refunded in full, with no reason needed.
After that the sauna is on its way, and our returns policy sets out exactly where that leaves you. Check the pallet on the day it arrives, count the parts against the list in the manual, and tell us about anything damaged or missing within 48 hours; anything that arrives damaged or faulty is ours to put right either way.
About this product
The Princeton is an Almost Heaven outdoor barrel sauna for four to six people, built from western red cedar staves, 1.83m across and 2.39m front to back, and 1.956m tall. Inside are two facing benches with 2.21m of room between the end walls, enough to lie down.
A Harvia The Wall 8kW heater with its controls built in is included, with the sauna stones and an interior LED light. It runs on a 50A single phase circuit, against 40A for the smaller Pinnacle, wired and certified by an electrician.
The sauna arrives as a kit on one pallet, with kerbside delivery to mainland Britain included in the price. The maker gives about 415kg for the whole kit, and two people can carry every part by hand from the kerb.
- Secure paymentProcessed by Shopify Payments over an encrypted connection.
- 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.
The room is 2.21 metres between the end walls, so each bench takes an adult full length and six can sit. It is the longest room of the four barrels in this range, and the extra length costs 560mm of garden over the 6ft one.
Worth confirmingtwo of you will ever use it. Six seats take longer to heat and cost more to run than four, and the Pinnacle does the same job in a smaller footprint for £1,200 less.
This arrives as a kit. The maker's own guidance is two or three people and a few hours, working from the printed manual, on a base you have already laid. Nothing about it needs a specialist trade until the electrician arrives.
Worth confirmingyou want a cabin delivered finished and switched on. Nothing in a barrel comes pre-assembled, and a wet Saturday with a mallet is part of the purchase whether you swing it or pay somebody to.
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. Things this size are almost never sent back because they were the wrong product; they are sent back because they were the wrong size for the space.
The base is the one to respect. Almost Heaven's own instructions ask for a foundation that is flat and able to carry more than 1,000 pounds, which is about 454kg, before anything is stood on it. This is the longer barrel, so the slab is longer too.
From order to first use.
Here is each stage, and who does what. Before you order, email hello@tarnfell.com and we will confirm the current lead time, delivery to your postcode, installation options or anything else you would rather have settled first.
- Week 0
Order and site check
Base, access and your electrical supply are agreed before the order is placed. You arrange the base and the circuit; we confirm your delivery date and the lead time in writing.
- Before it arrives
The base and the circuit
A flat, load bearing slab or two strip footings, laid and cured. An electrician runs a 50A single phase circuit to the position and leaves it ready to terminate. The 8kW heater takes a 50A circuit, against 40A for the 6kW, so the electrical work does not grow with the sauna.
- Delivery day
Kerbside, on a pallet
A lorry brings one pallet to the kerbside or the nearest firm, level spot it can reach. Check the pallet against the parts list in the manual on the day and tell us about anything damaged or missing within 48 hours.
- Build day
Two or three people, a few hours
Cradles down and levelled, staves laid up, end walls fitted, bands tensioned, benches in, heater hung. The maker's own guidance is two or three people and a handful of hours. We can introduce you to an independent installer instead.
- Before first use
The electrician returns
The heater is terminated and the circuit tested and certified. Outdoor circuits and rooms containing a sauna heater are notifiable work in England and Wales, so you should be handed a certificate.
What owning one actually involves.
The handful of things that decide whether this is still in use in year three.
A flat, load bearing slab about 1.9 by 2.4 metres, or two strip footings, laid before the pallet arrives. Almost Heaven ask for a foundation rated above 1,000 pounds, roughly 454kg, and a barrel that is not level will not band up straight.
Cedar is naturally durable and is normally left unfinished outdoors, where it weathers to silver grey over a season or two. That is the timber behaving, not failing, and it needs no treatment.
A barrel sheds water on its own curve, which works as long as nothing sits on top of it. Under trees, leaf litter and standing damp collect along the crown and stay there. Six feet of clear sky above it is worth more than any treatment.
The maker's figure is 180°F, about 82°C, in an hour from cold with the 8kW heater, and the heater's built in controls will delay the start by up to eight hours so it is hot when you get in.
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 £3.16
Heat up: 8kW for 1 hour is 8 kWh. Holding: 1.5 hours at roughly 40% duty is 4.8 kWh. Total 12 kWh at 26.32p is £3.16. Winter costs more, a warm evening less.
about £328
104 sessions at £3.16. A bigger room costs more to heat whether one person or six is in it, which is the honest argument for buying the smaller barrel if it is usually just the two of you.
stones and a jacket
Sauna stones are consumable and are restacked yearly and replaced when they crumble, normally every few years. Beyond that a barrel has no filter, no pump and no chemistry, so there is nothing else on a schedule.
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. Heat up and holding figures are calculated from the heater's rated 8kW output, not measured on an installed sauna. A barrel is single skin, so it draws more when it is cold outside.
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 heater circuit The Wall 8kW is 230V single phase at 50A on 3 x 6mm2 cable, or 400V three phase at 3 x 16A on 5 x 2.5mm2. The 6kW barrels need 40A, so this one asks more of your supply. Outdoor circuits and rooms containing a sauna heater are notifiable electrical work in England and Wales. | Once, before first use | A qualified electrician |
| Check the bands Timber moves as it settles and as the seasons turn. The steel bands are re-tensioned after the first few weeks and then checked with the clocks, which is what keeps the staves tight and the barrel watertight. | After settling, then twice a year | You |
| Restack and inspect the stones Lift the stones out, discard any that are cracked or crumbling, and restack them loosely so air moves between them. Tightly packed or broken stones make the elements work harder and shorten their life. | Yearly | You |
| Air it after use Leave the door open and the vent clear until the room is dry. A barrel is single skin and unheated between sessions, so trapped damp is what marks the benches, not the heat. | Every session | You |
| Wash the benches Plain water and a brush, no detergent and nothing film forming. Bare timber in a sauna is meant to stay bare. | Monthly, or after heavy use | You |
| Check planning if it sits near a boundary Outbuildings are usually permitted development, but the rules tighten within two metres of a boundary, where 2.5 metres is the height limit. At 1.956 metres this clears it, but listed buildings, conservation areas and flats are all treated differently. | Once, before you order | You, with your council |
Where this comes from.
Regulation and guidance, linked so you can read it yourself. None of it is our opinion.
- Outdoor circuits and rooms containing a sauna heater are notifiable electrical workApproved Document P, 2013 edition
- Outbuildings within two metres of a boundary are limited to 2.5 metres in heightPlanning Portal, outbuildings
- 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 Wall SW80 is rated 8kW, 230V single phase, 50A, 3 x 6mm2Harvia, The Wall SW80 product data
- Electricity unit rate of 26.32p per kWh, 1 October to 31 December 2026Ofgem energy price cap
- Almost Heaven have been building saunas for over 40 years and the barrels are made in the USAAlmost Heaven Saunas
Every figure the makers publish.
- Lead time
- Estimated 10 to 15 working days from order. We confirm stock and your delivery date in writing when we process your order.
Cabin figures from Almost Heaven's published dimensions for the Princeton and from the 2026 UK brochure for this model; heater figures from Harvia's own data for The Wall SW80. Where a figure is ours rather than theirs, it says so.
What arrives, and what does not.
- The sauna as a kit: cedar staves, the two end walls with the tempered glass door fitted, the cradles, the stainless bands, the benches and the backrests
- Weather resistant support cradles, and stainless steel bands, hinges and fasteners
- The Harvia The Wall 8kW heater, with its controls and timer built into the heater rather than on a separate panel
- Sauna stones
- An interior LED light
- The printed assembly and owner's manual, with the parts list to check the pallet against
- The base. A flat, load bearing slab or strip footings, laid and cured before delivery
- The electrical work. A 50A single phase circuit, run, terminated and certified by an electrician
- Assembly, unless you ask us to arrange it
- Delivery to the Scottish Highlands, islands and hard to reach addresses, which is quoted before dispatch
Reasons to buy something else.
Delivery is by lorry to the kerbside. A shared private road, steps to the kerb or a narrow lane can mean the pallet stops somewhere you then have to carry a kit from.
This is one dedicated circuit, not a socket. If the consumer unit is full, or the run is long, the electrician's bill is the part of this purchase that varies most.
Six seats cost about £80 a year more to run than four at twice weekly use, and take up 560mm more garden. If the sauna is normally for two, the Pinnacle is the better buy and it is £1,200 cheaper.
Cedar left outdoors goes silver grey within a couple of seasons. Nothing stops it, and treating a sauna exterior is not something the maker asks for.
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 and capacity
-
Verified
External and internal dimensions, bench height and depth, and the interior height are taken from the dimensioned drawing published for this model, and agree with the maker's own published figures.
- Heater and electrical supply
-
Verified
The 8kW output, the 50A single phase connection and the 3 x 6mm2 cable are Harvia's own published figures for The Wall SW80.
- What is in the price
The heater, the sauna stones and the interior LED light are listed as included on the distributor's own product record for this code. Nothing beyond that is claimed.
- Weight, lead time and delivery
The 415kg shipping weight is a retailer's figure. Lead time is stated as an estimate and we confirm stock and your delivery date in writing when we process your order, and delivery to the Scottish Highlands, islands and hard to reach addresses is quoted before dispatch.
- Warranty
Two years on the barrel against manufacturing defects, and two years on the Harvia The Wall heater under Harvia's published warranty terms, with a third year on the heater when it is registered with Harvia. The UK distributor administers claims and raises them with the maker where needed, and you deal only with us. The cabin is sold for home use: commercial or very frequent use can affect cover.
The three closest to it.
Almost Heaven Huntington: 4 to 6 Person Canopy Barrel Sauna
£7,395.00- Four to six people
- 8kW
- 2.49m long
- covered porch
Holl's Orphée 180: 5 to 6 Person Outdoor Sauna
£7,895.00- 5 to 6 people, 205 × 180 × 215cm
- Barrel
- 9kW Holl's Vulkano stove included
Holl's Hestia 160: 4 to 6 Person Outdoor Sauna
£7,950.00- 4 to 6 people, 205 × 160 × 220cm
- Heat treated pine
- 6kW stove 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.