Ad Polar Recovery Sauna Cube review 2026: specs, real price and the small print (desk review)

The model reviewed

Polar Recovery Sauna Cube (3–5 person)

From £4,999.99 at Polar Recovery

£4,999.99 wooden front or £5,999.99 glass front. Price checked 11 November 2026.

Capacity

3–5 people

Heat

Harvia Vega 6kW electric heater (included)

Power

Dedicated 32A supply with isolator or 32A commando socket (retailer guidance)

Size

210 × 205 × 160cm external (H × W × D); 5.5m³ inside

Build

Thermowood, 45mm walls, alder benches

Warranty

2 years

A 3–5 person outdoor cube in thermowood with an L-shaped alder bench, a tempered glass door and a black Katepal roof. The 6kW Harvia Vega heater is included.

• Retailer quotes professional assembly at £1,200–£2,000 depending on location; electrics are separate.
• Retailer says the base must support about 1,000kg (sauna plus users).

See current price at Polar Recovery Ad

Specs are as published by the retailer. We have not tested this product.

Price, and what the Black Friday offer means

On 11 November 2026 the listing priced the Cube at £4,999.99 with a wooden front or £5,999.99 with a full glass front. It also showed a “Black Friday price” of £4,250 for the wooden front, applied in the basket and ending at 23:59 on Monday 30 November (UK time). The glass front was marked “Not in the Black Friday sale”.

The listing also shows higher crossed-out prices (£6,999.99 and £7,999.99). We haven’t seen the Cube sold at those prices, so we compare against what you’d actually pay now. When we checked on 10 November the Cube was out of stock; it was back in stock on 11 November.

Specs from the listing

Spec	Polar’s figure
Capacity	3–5 people
Timber	Thermowood shell, alder benches
Wall thickness	45mm, no insulation (by design, per Polar’s FAQ)
Inside (H × W × D)	200 × 196 × 140cm, 5.5m³
Outside (H × W × D)	210 × 205 × 160cm
Flat-pack size (H × W × D)	100 × 117 × 200cm
Weight	600kg on the spec list; “approximately 500kg” in the FAQ
Heater	Harvia Vega 6kW, included
Also included	Bucket, ladle and thermometer; two headrests
Warranty	2 years, conditions apply (below)

The heater: is 6kW enough?

PoolMarket lists the Harvia Vega BC60 for saunas up to 8m³. The Cube’s 5.5m³ is inside that. But Steam & Oak explains that Harvia’s sizing rule adds 50% for solid timber walls and about 1.2m³ for each square metre of glass. On that rule, the Cube’s solid thermowood walls take it to about 8.25m³ before any allowance for the glass door, which is just above the BC60’s range, and the full glass front adds more. We haven’t measured how long it takes to heat. Ask Polar Recovery how long its Cube takes to reach temperature in winter, especially if you want the glass front.

Electrics

Polar says a qualified electrician must connect the heater. Its listed typical requirements are a dedicated 32A supply, correct cable sizing, a suitably rated isolator switch or 32A commando socket, and compliance with BS 7671. You don’t need three-phase. Running a new supply to a garden sauna typically costs about £700–£2,000; see sauna electrical requirements.

At the Ofgem cap of 26.32p per kWh, a 6kW heater costs about £2.17 a session on the assumptions in our running-costs guide.

Base, delivery and assembly

• Base: the FAQ asks for a solid, level base that will support 1,000kg in total. Polar lists concrete, paving slabs, tiles, patio decking or reinforced gravel, and says to avoid slopes and areas with standing water. See sauna base options.
• Delivery: made to order, with 3–4 week delivery from Polar’s warehouses near Weston-super-Mare. The self-assembly option arrives on a tail-lift lorry and is moved as close to your chosen spot as a pump truck can get it.
• Assembly: Polar says that if you’re handy and have a helper you can build it in a day, though most people split it over two. Its carpenters can build it for you; it quotes £1,200–£2,000 depending on location.

Warranty conditions

The two-year warranty covers manufacturing or construction defects and missing or faulty parts. Read the conditions before you buy:

• If you build it yourself, you must apply a breathable wood oil or sauna-safe finish inside and out. Polar says this is required to activate the warranty.
• Exclusions include outdoor storage of the flat-pack kit, installation on uneven or unprepared foundations, damage from improper finishing, natural characteristics of wood, extreme weather, and glass damage or condensation.
• Failing to inspect all parts before assembly voids it.

Returns

You have 14 days after delivery to cancel for any reason, even once unpacked, and Polar collects for free (collection from Scotland, Northern Ireland and Ireland costs 10% of the price). From day 15 to day 60, Polar’s returns promise still applies if the sauna isn’t built and is in its original packaging, with a 15% restocking fee including collection. Once it’s built, the 60-day promise no longer applies.

What it really costs

Item	Cost
Sauna Cube, wooden front	£4,999.99 (£4,250 in the Black Friday offer)
Optional: Polar’s assembly	£1,200–£2,000
Electrician and supply	About £700–£2,000
Base	Varies: see sauna base options
Breathable oil, stones if needed	Extra

So expect to spend roughly £5,000–£9,000 all in, before the base, depending on the offer, distance from the house and whether you build it yourself.

How it compares

The 2-person Cube Mini costs only £300 less than the full-size Cube, with a 3.5kW heater and 2.8m³ inside. Steam & Oak’s Ruutu 200 cube is much dearer (£7,925 with a 9kW Cilindro) but arrives fully assembled. For more choice, see best outdoor saunas and barrel vs cube saunas.

Smaller 2-person version

Polar Recovery Sauna Cube Mini (2 person)

From £4,699.99 at Polar Recovery

£4,699.99 wooden front or £5,499.99 glass front. Price checked 10 November 2026.

Capacity

2 people

Heat

Harvia Vega 3.5kW electric heater (included)

Power

Dedicated 32A supply with isolator or 32A commando socket (retailer guidance)

Size

216 × 167 × 120cm external (H × W × D); 2.8m³ inside

Build

Thermowood, 45mm walls

Warranty

2 years

From £4,699.99 (wooden front) or £5,499.99 (glass front), with a Harvia Vega 3.5kW heater and 2.8m³ inside.

See current price at Polar Recovery Ad

Specs are as published by the retailer. We have not tested this product.

Our verdict (from the specs)

On paper the Cube is a lot of sauna for about £5,000, with a heater included and thermowood throughout. Before you buy, check three things: whether 6kW is enough for your choice of front, that your base can carry 1,000kg, and that you’re happy to oil the timber to keep the warranty. And budget for the all-in cost: with electrics and maybe assembly it comes to roughly £5,000–£9,000 before the base.