A traditional home sauna usually uses a 3 to 9 kW electric heater and costs around £0.10 to £0.30 per kWh in the UK. This means running costs range from about £0.30 per hour for a 3 kW heater to £0.90 per hour for a 9 kW heater. Preheating typically takes 30 to 45 minutes, which adds to the overall cost depending on how often and how long the sauna is used.

Infrared saunas are highly energy-efficient. On average, running a SaunaSupply sauna costs between £0.08 to £0.40 per hour, depending on the model size, local electricity rates, and how often it's used. For example, a standard 2-person sauna using a 1.5–2.0 kW heater may cost around £2 to £4 per month if used 3–4 times per week. This makes it a very economical option for regular at-home wellness.