Infrared sauna electricity cost depends on power draw, total powered time and your electricity rate. Include warm-up as well as the time you sit inside. A universal claim such as “pennies per session” is not useful unless it states those assumptions.
This guide helps you estimate operating costs. It does not quote a national installation price or promise a particular utility bill. For equipment selection, use the main buying guide; for current seller quotes, see how to compare delivered prices.
The electricity-cost formula
Estimated kWh = watts ÷ 1,000 × hours powered.
Estimated session cost = kWh × your price per kWh.
A kilowatt is 1,000 watts. A kilowatt-hour measures energy used over time, which is the unit billed for electricity consumption. The US Energy Information Administration explains these units.
For a planning estimate, use the sauna’s rated input power and assume it draws that amount for the full powered period. Actual energy can differ because heaters cycle, settings vary and accessories may have separate loads. This is a transparent calculation, not a meter reading from a tested sauna.
Worked example: a 2,000-watt sauna
Suppose warm-up takes 20 minutes and the session lasts 30 minutes. The total is 50 minutes, or 0.833 hours. At an illustrative rate of $0.20 per kWh:
2,000 ÷ 1,000 × 50 ÷ 60 = 1.667 kWh.
1.667 × $0.20 = about $0.33 per use.
Twenty such uses would cost about $6.67 in electricity under those assumptions. Counting only the 30-minute seated period would yield $4.00 for the month, understating this full-power example by $2.67. The difference illustrates why warm-up belongs in the calculation.
Cost per session at different electricity rates
The table assumes 60 minutes of total powered time at the listed wattage, including warm-up. Rates are examples, not current national averages. Use the nameplate and tariff for your own setup.
| Rated power | Energy at full draw | $0.15/kWh | $0.25/kWh | $0.40/kWh |
|---|---|---|---|---|
| 1,000W | 1.00 kWh | $0.15 | $0.25 | $0.40 |
| 1,500W | 1.50 kWh | $0.23 | $0.38 | $0.60 |
| 2,000W | 2.00 kWh | $0.30 | $0.50 | $0.80 |
| 2,500W | 2.50 kWh | $0.38 | $0.63 | $1.00 |
Multiply by 0.75 for 45 minutes, or by 1.5 for 90 minutes, when using the same constant-power assumption. This is an energy-budget calculation, not a recommendation for how long to remain in a sauna.
Monthly and annual planning
Multiply the session estimate by the number of times the sauna is heated. Two people sharing a single session do not automatically double the cabin’s energy consumption. Two separate sessions with a complete cool-down and warm-up can be quite different.
| Uses per month | Monthly energy | Monthly electricity | Annual electricity if repeated for 12 months |
|---|---|---|---|
| 8 | 16 kWh | $4 | $48 |
| 16 | 32 kWh | $8 | $96 |
| 24 | 48 kWh | $12 | $144 |
These figures exclude standby power, separate accessories, laundry and changes in household heating or cooling. They also assume the same tariff throughout the year. Keep the examples separate from your actual measured results.
Find the right rate on your electricity bill
Look for the charges that change with consumption. Your bill may separate electricity supply from per-kWh delivery charges. A fixed monthly customer fee is usually payable whether or not you use the sauna, so allocating the entire fee to the sauna overstates its incremental cost.
With time-of-use billing, the hour of use matters. With tiered pricing, extra consumption may fall into a different band. If the bill is unclear, ask the utility which rate applies to additional household consumption at your intended time. Do not substitute a national average when your own tariff is available.
Why your actual reading may differ
- Starting conditions: a cold room and cabin change the warm-up required to reach a given setting.
- Controls: heater cycling and programs can change average draw.
- Door opening: frequent opening changes the heat lost from the cabin.
- Accessories: include separately powered devices if you use them during the session.
- Idle time: leaving the equipment powered between users can change the total.
Do not defeat timers, change wiring or add insulation to chase a cheaper session. Use the operating and placement instructions for the model. If performance changes noticeably, investigate through the manufacturer rather than assuming the solution is a higher temperature or longer run.
How to measure without guessing
Ask an electrician about a compatible measurement method for your circuit and load. An ordinary consumer plug-in meter may not support a sauna’s current, receptacle or voltage. Never use an adapter to make a meter fit.
For a useful comparison, record the model, starting room temperature, setting, warm-up duration, seated time, accessories and total measured kWh. Repeat under similar conditions. Whole-home utility data can help, but refrigerators, water heaters and other loads make it difficult to attribute every change to the sauna.
Electricity is only part of ownership cost
Use this worksheet when comparing a home cabin with paid sessions elsewhere:
- Initial outlay: delivered equipment price, assembly, electrical work and room preparation.
- Recurring costs: electricity, cleaning supplies, towel laundry and any optional subscription.
- Service exposure: labor, shipping and parts that are outside warranty coverage.
- Future changes: moving, disassembly or disposal if you change homes.
For a personal cost-per-use estimate, divide the initial outlay by the number of sessions you realistically expect, then add recurring cost per use. For example, a hypothetical $6,000 installed purchase spread over 1,000 uses is $6 per use before electricity and maintenance. This is arithmetic, not a current sauna price or a prediction of product life.
Running-cost FAQs
Is a 120V sauna cheaper to run than a 240V sauna?
Voltage alone does not answer that. Compare energy in kWh for the actual operating period. A different supply voltage can accompany different equipment power and capacity.
Does a larger sauna always cost more per session?
Not necessarily in every setup. Compare rated power, powered time and actual measurements. Do not infer cost from the capacity label alone.
Can I leave it on all day to avoid warm-up?
Do not operate outside the manufacturer’s instructions. For budgeting, count every powered hour; avoiding a fresh warm-up does not make the intervening hours free.
Where do installation expenses belong?
Keep them in the initial project budget rather than the electricity line. The installation guide explains what to confirm before ordering.