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Outdoor Barrel Sauna SAUNARI U330 — Harvia Heater, 6-8 People
Finnish sauna tradition for British gardens

Finnish sauna UK: real löyly, in your own garden

Thermowood cabins made in the EU, each supplied with a Harvia electric heater and sauna stones. Barrel, cube and panoramic glass models from a two-person cabin to a cube for ten, on display at two partner showrooms in Essex.

Outdoor Barrel Sauna SAUNARI U330 — Harvia Heater, 6-8 People · View in the shop

Sauna with Harvia heater, as standard

Each outdoor sauna cabin ships with a Harvia electric heater matched to the cabin volume, plus sauna stones, so you never have to source the most important component separately.

Thermowood, not chemically treated pine

Heat-treated timber with no chemical impregnation: stable through steam and frost, and no yearly sealing required, which is one job fewer in a British garden.

Barrel, cube or glass

Four barrel sizes, five cube cabins and three panoramic glass models, from a cabin for one or two people to a cube that seats ten.

See one in Essex first

Partner showrooms at garden centres in Maldon and Colchester, and a UK freephone line on 0800 033 4032 for anything the page does not answer.

What 'Finnish' should mean when you buy a sauna in Britain

The word gets attached to almost every wooden cabin sold online, so it is worth being precise. A Finnish sauna is defined by how it behaves, not by a flag on the listing: a heater carrying a proper bed of stones, timber that copes with steam and frost, benches at sensible heights, and ventilation that moves the air rather than trapping it. Ladle water onto the hot stones and the burst of steam that follows is löyly, the moment around which the whole ritual is built. A cabin that cannot give you that is a warm shed.

SAUNARI outdoor saunas for UK gardens are built around exactly those elements. Every barrel, cube and panoramic set is supplied with a Harvia electric heater, the Finnish heater brand, and each cabin is made in the EU from thermowood. Every outdoor sauna for sale here links straight to its product page in the SAUNARI shop, where the current price is shown, and two partner showrooms in Essex have the saunas on display.

Models worth starting with

All models in the shop →
Outdoor Barrel Sauna SAUNARI U330 — Harvia Heater, 6-8 People

Outdoor Barrel Sauna SAUNARI U330 — Harvia Heater, 6-8 People

Family-sized barrel for 6–8, Harvia heater and starter stones in the crate.

Price & details in the shop →
SAUNARI U160 Outdoor Barrel Sauna — Harvia Heater Included

SAUNARI U160 Outdoor Barrel Sauna — Harvia Heater Included

Compact 2–4 person barrel that goes up over a weekend on a terrace or lawn.

Price & details in the shop →
SAUNARI G160 Outdoor Sauna — Cube for 3–4 People

SAUNARI G160 Outdoor Sauna — Cube for 3–4 People

Bestselling 3–4 person cube: skip the foundation, a level hardened base will do.

Price & details in the shop →
Glass Outdoor Sauna SAUNARI P130 — Panoramic View for 1–2 People

Glass Outdoor Sauna SAUNARI P130 — Panoramic View for 1–2 People

Curved panoramic glass for 1–2 people, tempered glazing and stainless fittings.

Price & details in the shop →
SAUNARI P1 Panoramic Outdoor Sauna — 6–8 People, Harvia Heater

SAUNARI P1 Panoramic Outdoor Sauna — 6–8 People, Harvia Heater

Fully glazed front with insulated double glazing and benches for 6–8.

Price & details in the shop →
Glass-Front Outdoor Sauna SAUNARI by Sieraj Garden — 4 Persons

Glass-Front Outdoor Sauna SAUNARI by Sieraj Garden — 4 Persons

Radek Sieraj's signature glass-front garden cabin for four, lighting and ventilation built in.

Price & details in the shop →

Finnish saunas for business: holiday parks, glamping, hotels and spas

Running holiday lodges, a glamping site, a spa or a gym, or building homes with gardens? We match cabins to your guest numbers and site, quote for multiple units and coordinate delivery to your project. Dealers and garden centres are welcome too.

  • Holiday parks and lodges
  • Glamping sites
  • Hotels and spas
  • Gyms and recovery studios
  • Housebuilders and landscape architects
  • Dealers and garden centres
  • Quotes for multiple cabins and sets: sauna, hot tub, cold plunge, outdoor shower
  • Models matched to your guest numbers and site, spec sheets and visuals for your project
  • Delivery coordinated to your site, installation available as an option
  • Trade terms for dealers and retailers after company verification (Company No. / VAT)
  • An option to finance the purchase through a bank facility with international credit insurance – we can go through it once we agree on the range

Buying for your own garden? Every model is also available on its own in the SAUNARI shop. SAUNARI shop →

Löyly, stones and steam: the Finnish part of a Finnish sauna

In Finland a sauna is judged by its löyly, the wave of steam that rises when water meets hot stones. Good löyly is soft rather than scalding, spreads evenly across the benches and fades gently, and it depends on three things working together. The heater has to hold a generous bed of stones that stores heat and lets it go slowly. The cabin has to be tight enough to keep that heat and vented enough to keep the air fresh. And the timber has to take on a little moisture and give it back without warping or scorching the skin.

This is why a sauna with Harvia heater included is the sensible starting point for anyone searching for a Finnish sauna in the UK. Harvia is a Finnish heater brand, and every SAUNARI barrel, cube and panoramic cabin is supplied with one, together with sauna stones. A properly stacked bed produces dense, gentle steam, and a fresh load of stones after a season of heavy use keeps the heater performing as it should.

Outdoor Barrel Sauna SAUNARI U330 — Harvia Heater, 6-8 People

Thermowood in a British climate: why the timber matters

Traditional Finnish saunas were built from the trees to hand: Nordic spruce, pine and aspen, chosen because they are light, low in resin and pleasant to sit against. SAUNARI cabins keep that logic and add a step. The timber is thermowood, heat-treated at high temperature so that its structure changes: resin is driven out, the wood absorbs less moisture, and it moves far less as it cycles between a hot session and a cold night. No chemical impregnation is involved.

For a garden sauna in the UK that combination matters more than it would in a dry inland climate. Thermowood shrugs off wet winters, silvers slowly in the sun and, with the resin gone, the benches neither weep nor become painfully hot. In several models the benches and backrests are cut from the same thermowood as the walls, so the sauna ages evenly rather than piece by piece, and there is nothing to re-seal each spring.

SAUNARI U160 Outdoor Barrel Sauna — Harvia Heater Included

Barrel, cube or glass cabin: three honest shapes

Search for barrel sauna UK and the round cabin is what comes back, for good reason. The circular section leaves nowhere for the heat to die, so warmth circulates around you and the interior comes up to temperature faster than a square room of the same volume. The curve also braces the structure, which is why barrels stand outdoors for years without fuss. SAUNARI offers four: the U130 and U160 for 2–4 people, the U230 for 4–6 and the U330 for 6–8, pictured at the top of this page.

A cube is the choice when you want straight walls and a more architectural presence beside the house. The G130 through to the G400 run from a 2–4 person cabin to one that seats 8–10 across two bench levels, all in the same thermowood.

The panoramic models replace one wall with glass. The P130 uses curved glazing for 1–2 people, the P1 seats 6–8 behind a fully glazed front with insulated double glazing, and the flagship P2 adds a separate changing room. An outdoor sauna cabin with a glass front earns its keep where there is something worth looking at.

SAUNARI G160 Outdoor Sauna — Cube for 3–4 People

Choosing the size: from a 2-person outdoor sauna to a cabin for ten

Sizing a sauna is about benches, not floor area. Ask how many people will realistically sit at once, then whether any of them want to lie down. A 2-person outdoor sauna such as the P130 or the U130 suits a couple who use it most evenings and want it to heat quickly and economically. A 4-person barrel sauna, the U160 or the U230 depending on how often you host, is the everyday family format. Beyond that, the U330 barrel and the G280 cube seat six without anyone perching, and the G400 is built for gatherings.

Two practical checks before you settle on a model. First, the base: the G160 is designed to need no foundation at all, just a level, hardened surface, and the other cabins likewise arrive ready to stand on a prepared base; the exact requirement is on each product page. Second, access: a side passage that takes a wheelbarrow may not take a bench. If in doubt, the smaller of two sizes used every week beats the larger one used twice a summer.

Glass Outdoor Sauna SAUNARI P130 — Panoramic View for 1–2 People

Sauna kit UK: what a SAUNARI set actually contains

Outdoor sauna UK listings vary wildly in what they leave out, so here is what every SAUNARI sauna set on this page includes as standard (the limited Magika Y edition aside, whose configuration is confirmed at launch). The cabin arrives as elements of thermowood: wall and roof elements, benches, backrests and the interior fittings for that model. A Harvia electric heater is in the crate, matched to the cabin volume, with sauna stones (a full set on most models; the U330 ships with a starter set). Interior lighting comes with most cabins, a few add gravity ventilation, and most sets include assembly and start-up instructions.

The product pages list a production lead time of 4–6 weeks from order for most models, and every cabin is made in the EU; treat the listing as the current figure. On-site assembly is an optional extra on many models; the alternative is a weekend with the manual and a helper. The electrical connection to the heater is a job for a qualified electrician and is arranged separately. Exact contents, options and delivery terms for each model are on its product page in the SAUNARI shop.

SAUNARI P1 Panoramic Outdoor Sauna — 6–8 People, Harvia Heater

Editor's pick

  1. 01 Outdoor Barrel Sauna SAUNARI U330 — Harvia Heater, 6-8 People

    Best for families

    The largest barrel in the range seats six to eight on proper benches, keeps the classic round form that heats evenly, and still arrives as a complete set with a Harvia heater and stones.

  2. 02 SAUNARI U160 Outdoor Barrel Sauna — Harvia Heater Included

    Best 4-person barrel sauna for a modest garden

    Compact enough for a terrace or lawn, sized for two to four, and straightforward to assemble over a weekend. The sensible first barrel for a couple or small family.

  3. 03 SAUNARI G160 Outdoor Sauna — Cube for 3–4 People

    Best all-round outdoor sauna cabin

    The bestselling cube: three to four seats, heater and full stone set included, and no foundation needed beyond a level hardened base. Little to decide and nothing to add.

  4. 04 SAUNARI P1 Panoramic Outdoor Sauna — 6–8 People, Harvia Heater

    Best for a view

    A fully glazed front with insulated double glazing and benches for six to eight. If your garden looks out over fields, water or trees, this is the cabin that makes the most of it.

  5. 05 Glass-Front Outdoor Sauna SAUNARI by Sieraj Garden — 4 Persons

    Signature choice

    The garden cabin from the by Sieraj line, signed by Radek Sieraj: a fully glazed front, four seats, interior lighting and gravity ventilation, and a lower entry point than the larger panoramic models.

Barrel saunas

The classic Finnish outdoor form: round walls, even heat and nowhere for a chill to settle. Four sizes from a compact two-to-four-seater to a barrel for the whole family.

SAUNARI U130 Barrel Outdoor Sauna — Harvia Heater, 2-4 People

SAUNARI U130 Barrel Outdoor Sauna — Harvia Heater, 2-4 People

The entry barrel: magnesium-finished interior for a quicker heat-up, 2–4 people.

Price & details in the shop →
SAUNARI U160 Outdoor Barrel Sauna — Harvia Heater Included

SAUNARI U160 Outdoor Barrel Sauna — Harvia Heater Included

Price & details in the shop →
SAUNARI U230 Outdoor Barrel Sauna — 4–6 People, Heater Included

SAUNARI U230 Outdoor Barrel Sauna — 4–6 People, Heater Included

Mid-size barrel for 4–6 with a thermally sealed glass door and two bench levels.

Price & details in the shop →
Outdoor Barrel Sauna SAUNARI U330 — Harvia Heater, 6-8 People

Outdoor Barrel Sauna SAUNARI U330 — Harvia Heater, 6-8 People

Price & details in the shop →

Cube cabins

Straight walls and a quiet, architectural silhouette in thermowood. From a modest garden cube for two to a two-level cabin that seats ten.

SAUNARI G130 Outdoor Sauna — Cube with Harvia Heater, 2–4 pers.

SAUNARI G130 Outdoor Sauna — Cube with Harvia Heater, 2–4 pers.

A plain, well-made cube for 2–4 with lighting and benches included.

Price & details in the shop →
SAUNARI G160 Outdoor Sauna — Cube for 3–4 People

SAUNARI G160 Outdoor Sauna — Cube for 3–4 People

Price & details in the shop →
SAUNARI G200 Outdoor Sauna — Cube for 3-4 People, Heater Included

SAUNARI G200 Outdoor Sauna — Cube for 3-4 People, Heater Included

Cube for 3–4 that arrives as a complete set, heater and stones ready to connect.

Price & details in the shop →
SAUNARI G280 Outdoor Sauna — Cube for 4–6 People with Harvia Heater

SAUNARI G280 Outdoor Sauna — Cube for 4–6 People with Harvia Heater

Room for 4–6 in a clean thermowood cube with no annual sealing to keep up.

Price & details in the shop →
SAUNARI G400 Outdoor Sauna — Cube for 8–10 People with Harvia Heater

SAUNARI G400 Outdoor Sauna — Cube for 8–10 People with Harvia Heater

The gathering cube: two bench levels for 8–10 people and a Harvia heater to match.

Price & details in the shop →

Glass-front and panoramic saunas

One wall of glass instead of timber, so the garden becomes part of the session. Includes the signature by Sieraj garden cabin and a limited all-black edition.

Glass Outdoor Sauna SAUNARI P130 — Panoramic View for 1–2 People

Glass Outdoor Sauna SAUNARI P130 — Panoramic View for 1–2 People

Price & details in the shop →
Glass-Front Outdoor Sauna SAUNARI by Sieraj Garden — 4 Persons

Glass-Front Outdoor Sauna SAUNARI by Sieraj Garden — 4 Persons

Price & details in the shop →
SAUNARI P1 Panoramic Outdoor Sauna — 6–8 People, Harvia Heater

SAUNARI P1 Panoramic Outdoor Sauna — 6–8 People, Harvia Heater

Price & details in the shop →
Panoramic Outdoor Sauna SAUNARI P2 — Black, with Changing Room

Panoramic Outdoor Sauna SAUNARI P2 — Black, with Changing Room

Flagship black cabin with a separate changing room and insulated walls and roof.

Price & details in the shop →
SAUNARI Magika Y — All-Black Special Edition

SAUNARI Magika Y — All-Black Special Edition

Limited all-black edition: ebony-stained thermowood and smoked glass; unit count confirmed at launch.

Price & details in the shop →

Sauna with shower, and cabins for indoors

A complete sauna-and-shower building for the garden, plus compact thermowood cabins with Harvia heaters for a basement, garage or spare room.

Outdoor Sauna with Shower SAUNARI Spa, 2–4 persons

Outdoor Sauna with Shower SAUNARI Spa, 2–4 persons

Sauna, indoor shower and entry room under one roof for 2–4 people.

Price & details in the shop →
SAUNARI A-Cube Indoor Sauna — Compact 1–2 Person Sauna

SAUNARI A-Cube Indoor Sauna — Compact 1–2 Person Sauna

Indoor thermowood cube for one or two, a full Harvia heater in a very small footprint.

Price & details in the shop →
4-Person Indoor Sauna SAUNARI A1 — Harvia Heater Included

4-Person Indoor Sauna SAUNARI A1 — Harvia Heater Included

Four-person indoor cabin for a spare room, gym or spa, with ventilation trims.

Price & details in the shop →
SAUNARI A2 Indoor Sauna — 4 Persons, Harvia Heater Included

SAUNARI A2 Indoor Sauna — 4 Persons, Harvia Heater Included

Indoor four-seater with an electronic heater controller, session-ready in under 40 minutes.

Price & details in the shop →
SAUNARI by Sieraj 01 Indoor Sauna — 4-Person, with Heater

SAUNARI by Sieraj 01 Indoor Sauna — 4-Person, with Heater

Compact indoor four-seater from the by Sieraj line, heater and stones included.

Price & details in the shop →
SAUNARI by Sieraj 02 Indoor Sauna — 4 Persons, Heater Included

SAUNARI by Sieraj 02 Indoor Sauna — 4 Persons, Heater Included

Indoor by Sieraj cabin with heater controller, lighting and two-level benches for four.

Price & details in the shop →

The cool-down: water beside the sauna

Heat first, then cold. A temperature-controlled plunge tub, a garden hot tub and two outdoor showers complete the contrast half of the ritual.

SAUNARI W-Ice Cold Plunge Tub — Cold, Under Your Control

SAUNARI W-Ice Cold Plunge Tub — Cold, Under Your Control

Temperature-controlled cold plunge for the contrast half of the ritual.

Price & details in the shop →
SAUNARI W240 Garden Hot Tub — 6-Person Hydromassage with Harvia Heater

SAUNARI W240 Garden Hot Tub — 6-Person Hydromassage with Harvia Heater

Six-person thermowood hot tub with hydromassage jets and an insulating cover.

Price & details in the shop →
SAUNARI D1 Garden Shower

SAUNARI D1 Garden Shower

Freestanding garden shower on a standard garden water connection for the cool-down.

Price & details in the shop →
SAUNARI D2 Termo Garden Shower

SAUNARI D2 Termo Garden Shower

Thermowood-clad outdoor shower that matches the cabins in tone and material.

Price & details in the shop →

Sauna showroom in Essex: sit inside one before you decide

Photographs cannot tell you how a bench feels or how much light a glass front lets in, which is why SAUNARI saunas are displayed at two partner garden centres in Essex: Claremont Garden Centre, Maldon, Essex CM9 6TB, and Stanway Garden Centre, 342 London Road, Stanway, Colchester, Essex CO3 8LT. Both displays are run with Hot Tubs of London, tel. 01245 939 283. Walk in, sit down, look at the heater and ask questions. For anything else, SAUNARI UK is on freephone 0800 033 4032 or sales@saunari.eu.

Claremont Garden Centre (Hot Tubs of London)

Maldon, Essex CM9 6TB

Tel. 01245 939 283

Get directions →

Stanway Garden Centre (Hot Tubs of London)

342 London Road, Stanway, Colchester, Essex CO3 8LT

Tel. 01245 939 283

Get directions →

From the blog

All posts →
Barrel sauna vs cube sauna: which suits a British garden?

Barrel sauna vs cube sauna: which suits a British garden?

Once you have settled on an outdoor sauna for a UK garden, the next question is nearly always the shape. Barrel and cube are both built from thermowood and both fitted with a Harvia heater, yet they behave differently on the ground, in the cold and to the eye. Here the two go side by side, with a verdict for each type of British garden.

Read more →
Do you need planning permission for a garden sauna in the UK?

Do you need planning permission for a garden sauna in the UK?

For most houses in England, a modest outdoor sauna falls under permitted development, so no application is needed. The exemption comes with conditions on height, position and how much of the garden is already built on, and it is switched off entirely in some places. Here is how to read them, and when to call your council. It is general guidance for England, not legal advice.

Read more →
How much does an outdoor sauna cost in the UK in 2026? What drives the price

How much does an outdoor sauna cost in the UK in 2026? What drives the price

Ask three suppliers what an outdoor sauna costs in the UK and you will get three answers that describe three different things: a bare cabin, a cabin with a heater, or a finished sauna standing on a base with power connected. This guide explains what actually drives the cost of an outdoor sauna, from size and shape to glazing, heater and extras, lists what a SAUNARI set includes, and then works through the extra lines that decide the real total. For the current price of any model, see its product page in the SAUNARI shop.

Read more →
Löyly explained: how to use a Finnish sauna the way Finns do

Löyly explained: how to use a Finnish sauna the way Finns do

Most people who buy a Finnish sauna in the UK switch it on, sit until they are hot and get out. That is a warm room, not a sauna. The Finnish way is a rhythm of heat, steam and cold in rounds, and once you have it the same cabin gives you a different evening.

Read more →

Frequently asked questions

What drives the cost of an outdoor sauna in the UK?

Mostly size and form: how many people the cabin seats, whether it is a barrel, a cube or a glass-fronted panoramic model, and how much glazing it carries. The heater and controller matter too, and on SAUNARI sets a Harvia heater with stones is already included. Beyond the cabin itself, allow for the prepared base, a qualified electrician for the heater supply, delivery, and optional on-site assembly, plus extras such as a shower or an entry room. Within the range, the U130 barrel is the lowest entry point and the flagship P2 sits at the top; see the current price on the product page in the SAUNARI shop.

Do I need a foundation for a garden sauna?

Rather than a full concrete slab, the cabins are designed to stand on a prepared base, and the G160 is listed as needing no foundation at all, just a level, hardened surface. Whatever you lay, get it level: an even base matters far more than a heavy one. Check the product page of your model for its exact base requirement.

Is the heater included, and which brand is it?

Yes. Every SAUNARI sauna set includes a Harvia electric heater matched to the cabin volume, together with sauna stones. Harvia is a Finnish heater brand, and the stones matter as much as the heater for soft, even steam.

What electrical supply does an outdoor sauna need?

An electric sauna heater needs a dedicated supply installed by a qualified electrician; the exact requirement depends on the heater fitted to your model. Check the product page for the heater specification and plan the cable run before the cabin arrives.

Can I use a thermowood sauna through a British winter?

That is what the material is for. Thermowood is heat-treated so it absorbs far less moisture and moves very little between hot sessions and frosty nights, without chemical impregnation. A cold, clear evening is when a garden sauna is at its best.

How long does an outdoor sauna take to heat up?

It depends on cabin volume, the heater and the outside temperature. Barrels come up to temperature faster than square rooms of the same size because the heat has no corners to lose itself in, and the indoor A2 is listed as session-ready in under 40 minutes.

How many people fit in a barrel sauna?

SAUNARI barrels run from the U130 and U160 at 2–4 people to the U230 at 4–6 and the U330 at 6–8. To lie flat on the upper bench, choose the size above the number of people you expect; for a couple, the smaller barrel heats faster and costs less to run.

Can I see a SAUNARI sauna before I order?

Yes, at two partner showrooms in Essex: Claremont Garden Centre in Maldon (CM9 6TB) and Stanway Garden Centre on London Road, Colchester (CO3 8LT), both with Hot Tubs of London on 01245 939 283. The UK freephone line is 0800 033 4032.

Ready to bring löyly home?

Every model on this page links to its full listing in the SAUNARI shop, with the current price, set contents and options. Unsure of the size or shape? Call 0800 033 4032, email sales@saunari.eu, or sit inside one at a showroom in Essex first.

Browse outdoor saunas →

Phone: 0800 033 4032 · Email: info@finnishsauna.co.uk