1, 2 or 3 person infrared sauna: which size actually fits your home?

The most common question we get on WhatsApp isn't about heat or health — it's "which size?". Here's the honest sizing guide, with the real numbers, the UK rooms each size actually fits, and the one mistake to avoid.

The real dimensions (and the numbers people forget)

Using our Kajo range as the reference — the sizes are typical for the category:

	Footprint (W×D)	Height	Power	Floor area	Best thought of as
Kajo 1	90 × 90 cm	190 cm	1200 W	0.81 m²	A generous shower enclosure
Kajo 2	120 × 105 cm	190 cm	1900 W	1.26 m²	A double wardrobe
Kajo 3	155 × 110 cm	190 cm	2600 W	1.71 m²	A small sofa's footprint

Put another way: the Kajo 3 takes just over twice the floor space of the Kajo 1 — side by side they look closer in size than they are.

Three numbers people forget to check:

Ceiling height. All three cabins stand 190cm. You want a few cm of clearance — fine under most UK ceilings, which typically run 230–240cm, but measure lofts and garden offices with sloping roofs at the actual spot.

The door swing and a step-back. Allow ~60cm clear in front of the cabin door, and it's worth leaving a small gap to walls (a few centimetres for air circulation — check the manual's stated clearance at install).

The route in. These arrive as flat panels rather than a sealed box, so what has to fit is the largest single panel, not the whole cabin. Measure your narrowest door, turn and stairway, and message us with the numbers — we'll check them against the panel dimensions before you order. It's a two-minute check that prevents the only genuinely bad delivery day.

Power rarely decides the size: all three are supplied for a standard 13A socket, so stepping up doesn't move you into a different electrical bracket. Whether the socket and circuit in your chosen room are suitable is a separate question — worth putting to a qualified electrician if the wiring is old or that circuit already runs other heavy appliances.

Where each size actually lives

Kajo 1 — the corner-finder. Spare-bedroom corner, box room, under the stairs in some houses, garden office. (Bathrooms are a special case under the UK wiring regulations — ask an electrician before you plan one in there.) If the sauna is yours — a daily solo decompress — the 1 is honest about what it is and takes up genuinely little space. The lowest price in the range (£1,395) and the cheapest of the three to run (~16p a session at the July–September 2026 price cap).

Kajo 2 — the default. Fits where a double wardrobe fits: spare bedrooms, garage gyms, garden rooms, big landings. Two people at a squeeze-free sit; one person with room to stretch out, angle away from the panels, or sit cross-legged. This is the size most households should buy, and the one we'd pick ourselves.

Kajo 3 — the family one. A proper bench for three (or two in serious comfort, which is its real-life use). Wants a dedicated wall in a garage conversion, garden room or generous spare room. If sauna evenings are a shared thing in your house — couples who both train, families — the 3 is the one that doesn't get outgrown.

The mistake: buying for the household you occasionally are

The classic error runs both ways. Solo users buy the 3 "for when friends visit" — and heat an empty bench nearly every session. Couples buy the 1 "to save space" — and end up queueing, which quietly kills the habit. Buy for the usual session, not the exceptional one. Rule of thumb: count the people who'll realistically use it more than twice a week, then add nothing. If that's one person, buy the 1 — or the 2 for stretch-out comfort. If it's two, buy the 2 — or the 3 if evenings together are the point.

Still torn between two sizes? Send us your room dimensions on WhatsApp and we'll tell you straight — including if we think the smaller one is the right call. The full decision framework is in our UK sauna buying guide.