Commercial sauna buying guide: traditional or infrared, sizing and compliance

The first decision on a commercial sauna is not the cabin size, it is the technology, because traditional and infrared cabins differ on running cost by a factor of four and on preheating time by a factor of three. A sauna has become a differentiating asset in premium gyms, hotels, residences and public leisure facilities, and it produces measurable additional revenue when it is sized and operated correctly. This guide covers the two technologies, collective and semi collective configurations, the electrical, ventilation and accessibility rules that apply to a public access building, realistic budgets and the questions to settle before you sign.

Traditional or infrared: what actually separates them

A traditional Finnish sauna works by convection. An electric or wood fired heater warms volcanic stones which radiate ambient heat of 70 to 100 degrees. Humidity is modulated by pouring water on the stones, which is what makes the Nordic ritual social rather than solitary. Preheating takes 30 to 45 minutes. Energy consumption runs at about 1.3 kW per cubic metre of internal volume, so an 8 to 12 kW heater is the usual sizing for a collective cabin of 6 to 10 people, and operating cost lands between 80 and 250 EUR a month depending on frequency and local electricity prices.

An infrared cabin works by radiation. Carbon, ceramic or full spectrum panels emit infrared waves that penetrate tissue directly without heating the air significantly, so the cabin runs at 40 to 60 degrees, which suits users who find intense heat difficult. Preheating takes 10 to 15 minutes, a real advantage where turnover is high, and consumption is 1.5 to 3 kW per session, giving monthly operating costs of 30 to 80 EUR. Over five to ten years of operation, that difference is material.

Collective, semi collective or compact

In high traffic sites, meaning hotels, premium gyms, holiday residences and aquatic centres, the collective cabin is the reference configuration. Sized for 6 to 15 people, it needs 8 to 20 m2 of floor and an internal height of 2.00 to 2.30 m, and a bespoke build is often necessary to fit the architecture and meet accessibility requirements. Semi collective cabins for 4 to 6 people suit mid sized operations such as upmarket campsites, residences, care homes and smaller gyms: 3 to 8 m2 of footprint, quicker installation and a simpler electrical connection. For a mid sized gym adding a wellness area without a large budget, a four place infrared cabin usually gives the best ratio of investment to use.

What our own catalogue costs

Generic market bands are wide, so here are verified list prices excluding VAT from our range as reference points. A three person outdoor cabin is listed at 3,749 EUR excluding VAT, a six person outdoor cabin at 4,580 EUR excluding VAT, a combined sauna and steam room cabin at 18,000 EUR excluding VAT, and a sauna, steam room and shower cabin at 20,000 EUR excluding VAT. The outdoor models sit well below the 8,000 EUR entry point often quoted for professional traditional saunas, which is worth knowing before you accept a market average as your budget. Installation, electrical supply and any building works are quoted separately.

Compliance in a public access building

Installing a sauna in a facility open to the public is regulated, and non compliance exposes the operator to enforcement at the safety inspection, up to administrative closure. Four areas matter.

Sizing the room around the cabin

The cabin is rarely the constraint. Plan the changing route, a cool down or shower point adjacent to the cabin, and enough circulation for the accessibility turning circles. The electrical supply is the item that most often derails a project, because a 12 kW heater on a dedicated circuit may require an upgrade to the building supply. Settle that with the electrician before ordering, not after delivery. In a gym, the natural adjacency is a cold plunge bath or shower, which is also what converts a sauna from an amenity into a recovery offer members will pay for.

Frequently asked questions

Traditional or infrared for a gym wellness area?

Infrared where turnover is high, space is tight and running cost matters, since it is ready in 10 to 15 minutes. Traditional where the sauna is part of the positioning, in hotels, spas and premium clubs, and where the collective ritual is the point.

How much electrical power is needed?

Roughly 1.3 kW per cubic metre of internal volume for a traditional cabin, which gives 8 to 12 kW for a 6 to 10 person cabin, on a dedicated circuit. An infrared cabin needs 1.5 to 3 kW per session and connects far more simply.

Can a sauna be made wheelchair accessible?

Yes. Specify a threshold free door with at least 83 cm clear passage, a 1.50 m turning circle inside, slip resistant flooring and a low sliding bench. It is easier to design in than to retrofit, and easier on an infrared cabin because of the lower threshold.

What maintenance does a commercial sauna need?

Daily cleaning and airing, periodic timber treatment and stone replacement on a traditional cabin, panel cleaning on an infrared one, plus the annual electrical checks that apply to the building.

What lead time should we plan?

Stock cabins ship in 5 to 10 working days. Bespoke collective cabins are manufactured to the room and need to enter the programme at design stage, alongside the electrical and ventilation design.

Specify your sauna with the compliance file included