A home sauna’s running cost depends on its heater, fuel price and total operating time, including warm-up. Published estimates vary because sources use different tariffs and session lengths. Infrared examples generally come out lower than traditional electric saunas. For your own budget, use your tariff and expected use, then allow separately for servicing and upkeep.
Reading the published estimates
An hourly price only tells part of the story. The Hot Tub Superstore gives £1.32 for an hour with a 6 kW heater. Palmako puts the cost at £2.24 for the same heater rating running for 1.5 hours, including a 30-minute warm-up.
These examples use different electricity rates as well as different operating times, so they are not directly comparable. Neither source’s tariff should replace the unit price on your own bill.
Monthly figures have similar differences. Around £40 covers daily hour-long use in The Hot Tub Superstore’s estimate, while EdenHut quotes £35–£65 for daily 30-minute electric sauna sessions. Different session assumptions and pricing sit behind those totals; they do not establish a single UK average.
Working out your electricity bill
Use The Hot Tub Superstore’s calculation: heater power in kW × electricity price in £ per kWh × operating time in hours. Count the warm-up as well as the time you spend inside.
In Palmako’s example, a 30-minute warm-up followed by an hour-long session gives 1.5 hours of operation. Multiplying that by the 6 kW heater rating gives an energy estimate of 9 kWh. Applying Palmako’s electricity rate produces the cost quoted above.
Rated power makes this a straightforward estimate, not a measurement of every session. EdenHut describes electric heaters drawing full power during warm-up, then less to maintain the temperature. Actual consumption can therefore differ from a calculation that assumes full power throughout.
If you plan occasional sessions, use that frequency for your monthly total rather than adopting a daily-use estimate.
Infrared electricity and wood-fired fuel
Published infrared electricity estimates generally sit below those for traditional electric saunas. Both The Hot Tub Superstore and Palmako use a 1.5 kW infrared model in their examples, but the former covers an hour and the latter 1.25 hours, at different tariffs.
EdenHut’s infrared estimates vary too, reaching £1.50 per session with a daily-use assumption of 40-minute sessions. Heater rating, tariff and warm-up allowance explain why an advertised session price needs context.
For wood-fired saunas, EdenHut estimates £4–£6 per session and £32–£48 per month for twice-weekly use. Its fuel allowance is a 7–9 kg bundle of firewood per session. Palmako suggests 10–15 kg instead. Neither quantity is universal, so your fuel use and the price you pay for wood are the useful starting points.
Where the heat goes
A larger cabin takes longer to warm up and may need a more powerful heater. Better insulation helps retain that heat during warm-up and use. Alongside size and insulation, The Hot Tub Superstore identifies heater sizing, temperature and frequency of use as factors in running costs.
Its guidance says running at 75°C rather than 90°C can reduce costs. It also recommends avoiding unnecessary heating once the sauna has reached temperature. A shorter operating period means less time in your electricity calculation.
Garden saunas need particular care when using indoor examples as a guide. EdenHut identifies colder and outdoor conditions as factors that can increase consumption.
An advertised hourly price is not enough to compare models. Suitable heater sizing and good heat retention matter alongside the kW rating. For electrical work, use a qualified electrician.
Servicing, parts and cleaning
Fuel is only part of the ongoing bill. A typical UK sauna service costs £50–£200 per year in The Hot Tub Superstore’s estimate, depending on size and system type.
EdenHut separates upkeep into different budget lines. For electric saunas, it lists annual maintenance at £150–£200, average replaceable-parts costs at £30–£50, and basic cleaning and care at £20–£40. These are source estimates, not fixed charges for every home sauna. Its maintenance figures also differ in scope from the broader servicing range.
Purchase prices belong outside the running-cost calculation. zauna’s checked heater records include 4.5 kW and 6 kW electric models, but their purchase prices do not tell you what a session will cost.
Keep servicing and upkeep separate from the energy budget you calculate using your heater, tariff, total operating time and expected use.
Questions people ask
- How much does a 6 kW sauna cost per hour?
- The Hot Tub Superstore’s hourly estimate assumes the heater draws its rated power throughout. Your bill will depend on your electricity rate. Add warm-up time if it falls outside the hour, using the calculation above.
- Should warm-up time be included in running costs?
- Yes. You pay for the heating before you get in as well as during your session. Palmako includes a 30-minute warm-up before an hour-long session in its worked example.
- Is an infrared sauna cheaper to run?
- Published estimates generally put infrared electricity costs below those for traditional electric saunas. Your cost still depends on the model, tariff and total operating time, so the lower examples are not a fixed price for every infrared sauna.
- How much does a wood-fired sauna session cost?
- EdenHut’s session estimate and Palmako’s higher wood allowance are set out above. Their fuel assumptions differ, so base your budget on how much wood you use and what you pay for it.
- Do running-cost estimates include maintenance?
- Not always. Electricity and firewood examples usually cover fuel alone. The Hot Tub Superstore lists servicing separately, while EdenHut separates maintenance, replacement parts, and cleaning from energy spending.
Plan your home sauna
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