Ad Best sauna heaters UK 2026: 9 electric and wood-burning heaters compared, from £409.99
Harvia, HUUM and Narvi sauna heaters from UK retailers compared on price, output, room size, controls and stones, with how to size a heater for your sauna. Prices checked 11 November 2026.
Quick answer
For a typical 5–8m³ home sauna, a 6kW electric heater with built-in controls costs about £410–£490 at UK retailers: the Harvia Vega BC60 (£410 at PoolMarket), Narvi NM 6kW (£409.99 at Finnmark Sauna) and Harvia Wall 6kW (£489 at Steam & Oak). HUUM's heaters hold more stone but need a separate controller, which adds £394 or more. Wood-burning heaters start at £629 (Narvi Kuru 14) to £1,010 (HUUM HIVE Wood 13kW), plus a flue or chimney that can cost as much again. Stones are extra on almost all of them.
The heater decides how hot your sauna gets, how quickly and how it feels when you throw water on the stones. We compared nine heaters from Harvia, Narvi and HUUM sold by UK retailers: six electric and three wood-burning. We haven’t tested any of them. Specs are as the retailers publish them.
Electric heaters need an electrician
Every electric heater here is hard-wired on its own circuit. In England, that’s notifiable work under Part P. Budget for it: see sauna electrical requirements.
| Model | From | Size / suits | Spec | Power |
|---|---|---|---|---|
| Harvia Vega BC60 6kW PoolMarket | £410 | Saunas up to 8m³ (BC80: up to 12m³); 540 × 480 × 310mm | Electric, 6kW; built-in thermostat and timer | Single or three phase; hard-wired by an electrician |
| Narvi NM Finnmark Sauna | £409.99 | 4.5kW 3–6m³ · 6kW 5–8m³ | Electric, 4.5kW or 6kW; dial controls on the heater; up to 30kg stones | Single or three phase |
| Harvia Wall black steel heater Steam & Oak | £449 | 4.5kW 3–6m³ · 6kW 5–8m³ · 8kW 7–12m³ | Electric, 4.5–8kW; integrated controls; 20kg stones | 230V/400V, connected by a qualified electrician |
| HUUM DROP Finnmark Sauna | £429.99 | 3–13m³ across the range | Electric, 4.5–8.5kW; up to 55kg stones | Single or three phase; needs a HUUM UKU controller (UKU Local Black £394 at Finnmark) |
| Harvia Cilindro PC90 9kW Steam & Oak | £730 | 8–14m³ | Electric, 9kW; built-in controls; about 80kg stones | Dedicated supply by a qualified electrician (see manual) |
| HUUM STEEL Finnmark Sauna | £659.99 | 5–16m³ across the range | Electric, floor-standing; about 150kg stones | 230V single or 400V three phase; needs a HUUM UKU controller |
| Narvi Kuru wood-burning Finnmark Sauna | £629 | Kuru 14: 8–14m³ · Kuru 20: 10–20m³ | Wood-burning; glazed door | None (needs a flue) |
| Harvia M3 wood-burning Aqualine Saunas | £755 | 6–13m³; 710 × 390 × 450mm; 45kg plus 30kg stones | Wood-burning, 16.5kW; controls on heater | None (needs a chimney) |
| HUUM HIVE Wood Finnmark Sauna | £1,010 | 13kW 6–13m³ · 17kW 8–16m³ | Wood-burning; up to 90kg stones (13kW) or 130kg (17kW) | None (115mm flue) |
First, size the heater
Work out the hot room’s volume: length × width × height in metres. Then use the room range the maker gives for each output, as listed in the cards below. Steam & Oak explains Harvia’s adjustment: add 50% for solid timber walls and about 1.2m³ for every square metre of glass, because both soak up heat that an insulated panel wouldn’t. On that basis Steam & Oak treats its 6.6m³ Ruutu 200 cube as roughly 11m³ with a glass door, and fits a 9kW heater.
Barrels and log cabins are solid timber, so they usually need the next size up compared with an insulated indoor cabin of the same volume.
Electric heaters with built-in controls
Lowest price from Harvia
Harvia Vega BC60 6kW
From £410 at PoolMarket
£410 for the 6kW BC60; £451.20 for the 8kW BC80. Price checked 11 November 2026.
- Heat
- Electric, 6kW; built-in thermostat and timer
- Power
- Single or three phase; hard-wired by an electrician
- Size
- Saunas up to 8m³ (BC80: up to 12m³); 540 × 480 × 310mm
The Vega is Harvia’s mainstream wall heater, with thermostat and timer dials on the side. PoolMarket lists the 6kW BC60 at £410 for saunas up to 8m³ and the 8kW BC80 at £451.20 for up to 12m³. It can be wired single or three phase. PoolMarket’s page showed a “notify me when in stock” button when we checked. Dakam Outdoors had the BC60 at £549.
- PoolMarket showed a "notify me when in stock" button when we checked.
- Stones sold separately.
See current price at PoolMarket Ad
Specs are as published by the retailer. We have not tested this product.
Lowest price overall
Narvi NM
From £409.99 at Finnmark Sauna
£409.99 (6kW black) to £456.99; 4.5kW from £449.99. Price checked 11 November 2026.
- Heat
- Electric, 4.5kW or 6kW; dial controls on the heater; up to 30kg stones
- Power
- Single or three phase
- Size
- 4.5kW 3–6m³ · 6kW 5–8m³
Finnmark Sauna lists the Finnish-made Narvi NM at £409.99 for the 6kW in black. Other colours and the 4.5kW are £449.99–£456.99, and some variants were out of stock. It holds up to 30kg of stones, more than the Vega or Harvia Wall. The dials can be fitted on either side. The 9kW version is three-phase only.
- A 9kW version is three-phase only.
- Stones sold separately.
See current price at Finnmark Sauna Ad
Specs are as published by the retailer. We have not tested this product.
Black finish for dark interiors
Harvia Wall black steel heater
From £449 at Steam & Oak
£449 (4.5kW), £489 (6kW), £529 (8kW). Price checked 11 November 2026.
- Heat
- Electric, 4.5–8kW; integrated controls; 20kg stones
- Power
- 230V/400V, connected by a qualified electrician
- Size
- 4.5kW 3–6m³ · 6kW 5–8m³ · 8kW 7–12m³
- Warranty
- 2 years
A black steel version of Harvia’s wall heater at Steam & Oak: £449 (4.5kW), £489 (6kW) or £529 (8kW). It has integrated controls, takes 20kg of stones and has a two-year warranty. It’s the heater Steam & Oak fits in several of its garden saunas.
See current price at Steam & Oak Ad
Specs are as published by the retailer. We have not tested this product.
For bigger or solid-timber rooms
Harvia Cilindro PC90 9kW
From £730 at Steam & Oak
£730 (Xenio digital-control version £1,195). Price checked 11 November 2026.
- Heat
- Electric, 9kW; built-in controls; about 80kg stones
- Power
- Dedicated supply by a qualified electrician (see manual)
- Size
- 8–14m³
A 9kW tower heater for 8–14m³ rooms, holding about 80kg of stones, at £730 with built-in controls. A Xenio digital-control version is £1,195. Steam & Oak pitches it at log-walled and uninsulated garden saunas, and as a replacement for a wood burner. Budget for four boxes of stones.
- Stones sold separately (about four 20kg boxes).
See current price at Steam & Oak Ad
Specs are as published by the retailer. We have not tested this product.
Electric heaters with a separate controller
Most stone for its size
HUUM DROP
From £429.99 at Finnmark Sauna
£429.99 (4.5kW), £488 (6kW), £569 (9kW, rated 8.5kW); controller extra. Price checked 11 November 2026.
- Heat
- Electric, 4.5–8.5kW; up to 55kg stones
- Power
- Single or three phase; needs a HUUM UKU controller (UKU Local Black £394 at Finnmark)
- Size
- 3–13m³ across the range
HUUM’s teardrop-shaped wall heater holds up to 55kg of stones. Finnmark Sauna lists it at £429.99 (4.5kW), £488 (6kW) and £569 (9kW, rated 8.5kW). It needs a HUUM UKU controller, which is extra: the UKU Local Black was £394 and the UKU Wi-Fi Classic Black £579 at Finnmark. So a 6kW Drop with a basic controller comes to about £882 before stones. Steam & Oak sells the Drop for £899–£1,199; ask what’s included before comparing.
- Steam & Oak sells the same heater at £899–£1,199.
- Stones sold separately.
See current price at Finnmark Sauna Ad
Specs are as published by the retailer. We have not tested this product.
Big stone mass, tight spaces
HUUM STEEL
From £659.99 at Finnmark Sauna
£659.99 (6kW), £838 (9kW), £890 (10.5kW); controller extra. Price checked 11 November 2026.
- Heat
- Electric, floor-standing; about 150kg stones
- Power
- 230V single or 400V three phase; needs a HUUM UKU controller
- Size
- 5–16m³ across the range
A slim floor-standing column holding about 150kg of stones, at £659.99 (6kW), £838 (9kW) or £890 (10.5kW) at Finnmark Sauna. The retailer says the 6kW needs only 50mm side clearance. It also needs a UKU controller, which is extra.
- Retailer says side clearance on the 6kW is just 50mm.
See current price at Finnmark Sauna Ad
Specs are as published by the retailer. We have not tested this product.
Wood-burning heaters
Lowest-priced wood burner
Narvi Kuru wood-burning
From £629 at Finnmark Sauna
£629 (Kuru 14), £661 (Kuru 20); flue extra. Price checked 11 November 2026.
- Heat
- Wood-burning; glazed door
- Power
- None (needs a flue)
- Size
- Kuru 14: 8–14m³ · Kuru 20: 10–20m³
Narvi’s entry-level wood burner: £629 for the Kuru 14 (8–14m³) or £661 for the Kuru 20 (10–20m³), with water-tank versions at £1,066.54. It’s low-built with a glazed door. A flue kit and 35–40kg of stones are extra. Finnmark’s Narvi insulated steel flue kit 15 was £720.35–£911 depending on the roof parts.
- Flue kit and 35–40kg of stones bought separately.
See current price at Finnmark Sauna Ad
Specs are as published by the retailer. We have not tested this product.
The classic Harvia wood stove
Harvia M3 wood-burning
From £755 at Aqualine Saunas
£755 (Harvia steel chimney set £965 extra at the same retailer). Price checked 11 November 2026.
- Heat
- Wood-burning, 16.5kW; controls on heater
- Power
- None (needs a chimney)
- Size
- 6–13m³; 710 × 390 × 450mm; 45kg plus 30kg stones
- Warranty
- 2 years
£755 at Aqualine Saunas for 6–13m³ rooms, rated 16.5kW, weighing 45kg plus about 30kg of stones. Aqualine sells Harvia’s steel chimney set at £965, so the stove and chimney come to about £1,720 before stones and fitting. Steam & Oak offers the M3 as an option on several of its saunas with the chimney included.
- Stones not included (two boxes of 10–15cm stones).
See current price at Aqualine Saunas Ad
Specs are as published by the retailer. We have not tested this product.
Most stone in a wood burner
HUUM HIVE Wood
From £1,010 at Finnmark Sauna
£1,010 (13kW), £1,368 (17kW). Price checked 11 November 2026.
- Heat
- Wood-burning; up to 90kg stones (13kW) or 130kg (17kW)
- Power
- None (115mm flue)
- Size
- 13kW 6–13m³ · 17kW 8–16m³
£1,010 for the 13kW (6–13m³, up to 90kg of stones) or £1,368 for the 17kW (8–16m³, 130kg) at Finnmark Sauna. It uses a 115mm flue. Stones, flue kit and chimney parts are all extra.
- Stones, flue kit and chimney parts sold separately.
See current price at Finnmark Sauna Ad
Specs are as published by the retailer. We have not tested this product.
Budget for the extras
| Extra | Typical price we found | Applies to |
|---|---|---|
| Sauna stones, 20kg box | £40 (Finnmark olivine diabase) to £60 (Harvia box at Steam & Oak) | All heaters |
| HUUM UKU controller | £394 (Local) to £579 (Wi-Fi) at Finnmark | HUUM DROP, STEEL |
| Flue or chimney kit | £720–£965 | Wood burners |
| Electrician and new circuit | About £700–£2,000 for a garden sauna | Electric heaters, see our electrics guide |
Choosing between the brands? See Harvia vs HUUM vs Narvi. Deciding on fuel? See wood-fired vs electric saunas.
Frequently asked questions
What size sauna heater do I need?
Match the heater to the room's volume (length × width × height in m³), using the range the maker gives, e.g. 5–8m³ for a 6kW Harvia Wall. Steam & Oak says Harvia's rule is to add 50% for solid timber walls and about 1.2m³ for every square metre of glass, so an uninsulated barrel or a glass-fronted cabin needs a bigger heater than its bare volume suggests.
How much does a sauna heater cost in the UK?
On 11 November 2026, 6kW electric heaters with built-in controls cost £409.99–£489 at the retailers we checked. 9kW models were £569–£838 before any separate controller. Wood-burning heaters were £629–£1,368, not counting a flue or chimney.
Do sauna heaters come with stones?
Usually not. Every heater in this guide is sold without stones. A 20kg box costs about £40–£60 (Finnmark Sauna and Steam & Oak), and heaters take from 20kg (Harvia Wall) to about 150kg (HUUM STEEL).
Do I need an electrician to fit a sauna heater?
Yes, for any electric heater. They're hard-wired on a dedicated circuit, and in England a new circuit or work in a room containing a sauna heater is notifiable under Part P. See our sauna electrics guide.
Built-in controls or a separate controller?
Built-in dials (Harvia Vega, Harvia Wall, Narvi NM, Harvia Cilindro) are cheaper and simpler. Separate controllers (required for HUUM DROP and STEEL) cost extra but sit outside the hot room and often add Wi-Fi and scheduling.
Sources
We read each of these on or before 11 November 2026. Retailer links in this list are plain links, not affiliate links.
- PoolMarket: Harvia Vega sauna heater
- Steam & Oak: Harvia Wall black steel sauna heater
- Steam & Oak: Harvia Cilindro PC90
- Steam & Oak: HUUM Drop
- Steam & Oak: Ruutu 200 (Harvia sizing rule)
- Finnmark Sauna: Narvi NM
- Finnmark Sauna: HUUM DROP
- Finnmark Sauna: HUUM STEEL
- Finnmark Sauna: UKU Local Black controller
- Finnmark Sauna: Narvi Kuru
- Finnmark Sauna: Narvi insulated steel flue kit 15
- Finnmark Sauna: HUUM HIVE Wood
- Finnmark Sauna: olivine diabase sauna stones 20kg
- Aqualine Saunas: Harvia M3