Garden sauna · score 7.5 out of 10

Steam & Oak Hiili 2m Thermowood Barrel

Name: Steam & Oak Hiili 2m Thermowood Barrel
Brand: Steam & Oak
Price: 7995.00 GBP
Availability: InStock

£7,995 from Steam & Oak, about £9,695 ready to use. Needs a 50 A or three-phase supply.

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Photo: Steam & Oak

£7,995 at Steam & Oak

Check price at Steam & Oak

That price is for the Harvia Cilindro PC90 9kW version. 2 versions, £7,995 to £8,695: see them all.

Power50 A or 3-phase
HeaterIncluded
People4
Ready to use£9,695
Total over 5 years£11,985

The short answer

Ranked 31 of 98 garden saunas on our score.

Good for: 4 people, and a home with a big electricity supply (50 A or ).

Watch out for: The warranty isn't published.

People4
Heater9
Size W × D2.35 × 2 × 2.4 m
Power needed50 A or 3-phase
Wood (black)
WarrantyNot published

Questions people ask before buying this one

Will it run off a normal plug?

No. The heater needs a 50 A or supply. Ask an electrician to check your main fuse first. We add £1,150. Sauna electrics.

Is the heater included?

Yes, it is in the price.

Will it fit, and do I need planning permission?

The outside is 2.35 × 2 × 2.4 m (4.7 m² of ground). Leave room around it to build and treat the timber. At 2.40 m tall it is within the 2.5 m limit for outbuildings near a boundary. Planning rules.

What will it cost to run?

About £2.96 of electricity a session and £308 a year at 2 sessions a week, plus about £150 a year of upkeep. Change the numbers in the calculator below. If 2 of you would otherwise pay £10 each for community sauna sessions, it costs about the same as those sessions after 6.0 years.

Do I have to build it myself?

It comes as a kit: two people, one or two days. Palletised; self-assembly, one to two days for two people.

Will it last?

The warranty isn't published. Built from (black) with 44 mm walls. Outdoors, treat the outside once a year.

What it really costs

Price	£7,995
Heater	£0
Electrics: 50 a or three-phase supply Get quotes from local electricians	£1,150
Base Get quotes for a level base	£550
Ready to use	£9,695
Running, a year (2 sessions a week)	£308
Upkeep, a year	£150
Total over 5 years	£11,985

About £2.96 of electricity a session. If 2 of you would otherwise pay £10 each for community sauna sessions, it costs about the same as those sessions after 6.0 years.

Change the numbers

Sessions a week People each session Electrician's quote (£) Base (£) Price per kWh (p) Public sauna, a person (£)

Versions and prices

Every price here is the price Steam & Oak lists for that exact version, read from the seller's own product data. Prices change often; check the seller before buying.

Version	Price	Ready to use	Score
Harvia Cilindro PC90 9kW	£7,995	£9,695	7.5
Harvia Cilindro PC90XW 9kW WiFi (incl. door sensor)	£8,695	£10,395	7.5

The detail

Specifications

From the seller's pages. "Not published" means we couldn't find it.

Type	Garden sauna, barrel
People	4
Heating	Electric
Heater	Harvia Cilindro PC90 9kW
Heater in the price?	Yes
Power needed	50 A or supply. Harvia specifies a 3 x 16 A three-phase supply, or a single 50 A supply on 10 mm² cable for single-phase homes.
Outside size (W × D × H)	2.35 × 2 × 2.4 m
Wood	(black)
Wall thickness	44 mm
Top temperature	not published
Warranty	not published
Delivery	Palletised; self-assembly, one to two days for two people
Installation	not published
Weight	800 kg

How it scores

Ready-to-use cost per seat (25%)	7.1
Easy to power and install (20%)	6.7
Build and materials (20%)	9.4
Warranty (20%)	5.8
Specs the seller publishes (15%)	9.0
Score out of 10	7.5