Independent guide. Firwick doesn’t sell saunas. We’ve applied to some retailers’ affiliate programmes; if we’re accepted, links to them will be labelled Ad and we may earn a commission if you buy, at no extra cost to you. There are no affiliate links on this page yet. How we make money.
A two-person infrared sauna is the most common size for a home. This page puts the published details of five models side by side so you can see the trade-offs quickly. We haven’t tested these saunas and we don’t rank them; every figure comes from the retailer’s own product page on 4 November 2026.
At a glance
| Model | Use | Listed price (checked 4 November 2026, subject to change) | Power and supply, as listed | External size (W × D × H) | Warranty, as published | Sold by |
|---|---|---|---|---|---|---|
| Gravity Wellness Hemlock Series II | Indoor | £3,680 | 1,750 W; standard 3-pin UK plug | 1200 × 1050 × 1900 mm | 2 years electrical, 1 year timber (product page) | Gravity Wellness gravitywellness.co.uk |
| Gravity Wellness Hemlock Edge II | Indoor | £3,990 | 1,750 W; supply not stated, ask | 1200 × 1050 × 1900 mm | 2 years electrical, 1 year timber (product page) | Gravity Wellness gravitywellness.co.uk |
| SaunaPlunge Yorkshire Cabin, 2-person | Outdoor | £2,900 | 2,220 W; “standard 13A supply” | 1200 × 1050 × 1900 mm | Not stated in the product description; ask | Outdoor Living 365 outdoorliving365.co.uk |
| Insignia 2 Person Outdoor | Outdoor | £4,695 | 2,800 W; 13 A supply, no plug fitted (electrician connects) | 1500 × 1300 × 2300 mm | 2 years electrical; wood 2 years if Insignia installs, 1 year if self-installed | Heracles Wellness heracleswellness.co.uk |
| Gravity Wellness Outdoor Infrared Retreat (2–3 person) | Outdoor | £4,890 | Up to 4.5 kW combined; described as plug-powered, ask | 1800 × 1200 × 2150 mm | 2 years electrical, 1 year timber (product page) | Gravity Wellness gravitywellness.co.uk |
Each model is listed on the retailer’s own website, named in the table. We don’t earn from this page. Prices and specifications change; check with the retailer before you order.
Indoor or outdoor?
The two indoor Gravity cabins share a 1200 × 1050 mm footprint and are rated at 1,750 W, comfortably within what a 13 A plug can supply. The outdoor models need a weatherproof supply and a firm, level base, and the Insignia and Retreat are larger. Our outdoor vs indoor infrared guide covers space, access and planning.
Power: plug-in or electrician?
- Plug-in as described: Gravity Series II (standard 3-pin plug) and the SaunaPlunge Yorkshire Cabin (standard 13 A supply, with the retailer advising an electrician checks the outdoor socket).
- Electrician needed: the Insignia 2 Person Outdoor comes with a cable but no fitted plug.
- Ask first: Gravity lists the Outdoor Infrared Retreat at “up to 4.5 kW” but also as plug-powered. A 13 A plug supplies about 3 kW, so ask Gravity what supply it needs. See sauna electrical requirements.
Running cost
At the current price cap (26.32p/kWh), an hour at full power costs at most £0.46 for a 1.75 kW cabin, £0.58 for 2.22 kW and £0.74 for 2.8 kW. More in sauna running costs.
Delivery, installation and terms
- Gravity Wellness states free delivery to mainland UK, a made-to-order lead time of about 60 days, and optional professional installation at £400. Its returns policy and its terms and conditions describe cancellation differently; see our Gravity Wellness guide.
- Outdoor Living 365 describes a SaunaPlunge professional delivery and installation service for the Yorkshire Cabin. The product description doesn’t say whether it’s included in the price; ask.
- Heracles Wellness says the Insignia is delivered in heavy-duty wooden crates and needs a solid, level base.
How to buy, and who to contact
Firwick doesn’t sell saunas or take orders. You buy direct from the retailer, who handles payment, delivery, cancellation and warranty.
- Gravity Wellness: gravitywellness.co.uk; phone 01223 901185 or health@gravitywellness.co.uk, as listed on its contact page (gravitywellness.co.uk/contact).
- Outdoor Living 365 (SaunaPlunge): outdoorliving365.co.uk; use the contact details on its website.
- Heracles Wellness (Insignia): heracleswellness.co.uk; use the contact details on its website.
Before you pay, ask the retailer to confirm in writing: the supply the model needs, what delivery and installation include, the lead time, the warranty and the cancellation terms.
- Gravity Wellness product pages for the Hemlock Series II, Hemlock Edge II and Outdoor Infrared Retreat, and its contact page, gravitywellness.co.uk (read 4 November 2026).
- Outdoor Living 365, “The Yorkshire Cabin – SaunaPlunge Thermo Treated Outdoor Infrared Sauna – 2 person”, outdoorliving365.co.uk (read 4 November 2026).
- Heracles Wellness, “Insignia 2 Person Outdoor Infrared Sauna”, heracleswellness.co.uk (read 4 November 2026).
- Ofgem, “Energy price cap unit rates and standing charges”, 1 October to 31 December 2026: electricity 26.32p per kWh by Direct Debit, average across England, Scotland and Wales, ofgem.gov.uk (read 3 November 2026).
We list models whose details we could confirm on the retailer’s own page on the date shown. Inclusion isn’t a recommendation.