Key Moments
Monthly Running Costs
Typical hot tub electricity costs range from $20 to $60 monthly depending on size and conditions.Electricity Usage Breakdown
Heating accounts for about 75% of energy, with heaters and pumps as main power draws.Cost Influencers
Insulation quality, climate, temperature setting, electricity rates, and equipment efficiency greatly impact costs.Cost-Reduction Tips
Using good covers, lowering temperature, adding thermal blankets, shielding from wind, and scheduling heating lower bills.A hot tub costs most owners between $20 and $60 a month in electricity, using roughly 100 to 300 kilowatt-hours depending on its size, insulation, how often you use it and your local climate. At the 2026 US average rate of about $0.16 to $0.18 per kWh, a typical mid-size tub using around 200 kWh a month adds close to $30 to $36 to your bill. The heater does most of the work, so cold weather and a worn cover are what push the cost toward the high end.
Quick facts: hot tub running cost
| Detail | Figure |
|---|---|
| Typical monthly electricity cost | $20 to $60 |
| Monthly usage | About 100 to 300 kWh |
| Heater draw | 1,500 W (120V) or up to 6,000 W (240V) |
| Pump draw | About 1,500 W |
| 2026 US average electricity rate | About $0.16 to $0.18 per kWh |
| Biggest cost driver | Heating, roughly 75 percent of the energy used |
How much electricity does a hot tub use?
A hot tub’s two big power draws are the heater and the pump. A 120-volt heater pulls around 1,500 watts, while a 240-volt heater can draw up to 6,000 watts, and the circulation pump adds roughly 1,500 watts more. In use, a 120-volt tub consumes about 3 kWh per operating hour and a 240-volt tub about 7.5 kWh.
Over a month that works out to roughly 100 to 300 kWh for most tubs. Crucially, the heater does not only run when you are soaking. It cycles on and off around the clock to hold the water at temperature, and about three quarters of a hot tub’s total energy goes on that standby heating rather than actual use.
Hot tub cost per month by size
Bigger tubs hold more water and need more heating, so cost rises with size. These are typical monthly ranges at average US rates.
| Tub size | Typical monthly usage | Typical monthly cost |
|---|---|---|
| Small (2 to 4 person) | About 100 to 150 kWh | About $20 to $35 |
| Medium (4 to 6 person) | About 150 to 250 kWh | About $30 to $50 |
| Large (6+ person) | About 250 to 300+ kWh | About $50 to $65+ |
Poor insulation, a waterlogged cover or a very cold climate can push any of these higher, sometimes well above the ranges shown. A bill above about $150 a month for an average tub usually signals a fault, such as a heater running non-stop, and is worth a professional check.
The formula to work out your own cost
The same simple formula works for any appliance:
(Watts divided by 1,000) x hours used x your rate per kWh = cost
For a hot tub the tricky part is hours, because the heater cycles all day. The easier route is to use the monthly kWh estimate for your tub size and multiply by your rate. A tub using 200 kWh a month at $0.16 per kWh costs 200 x 0.16, which is about $32 a month. Our appliance electricity cost calculator handles the maths, and our guide on what a kilowatt-hour is explains the unit your bill uses.
What changes the cost most
- Insulation and cover. A high-quality, well-fitting cover can prevent up to 70 percent of heat loss. An old or waterlogged cover is one of the fastest ways to double your running cost.
- Climate. Cold weather and wind force the heater to work harder, raising costs by 20 to 30 percent or more in winter.
- Temperature setting. Every degree hotter costs more. Dropping the setpoint a couple of degrees when the tub is idle saves noticeably.
- Your electricity rate. The same tub costs far more in a high-rate state than a low-rate one.
- Component age and efficiency. Newer, variable-speed pumps and efficient heaters use less power than older equipment.
How to lower your hot tub running cost
- Fit a thick, well-sealed cover and replace it once it becomes waterlogged.
- Lower the temperature a few degrees, or when you will not use the tub for several days.
- Add a thermal blanket on the water surface under the cover for extra heat retention.
- Shelter the tub from wind with a fence, screen or shrubs.
- If your utility offers time-of-use pricing, schedule heating for cheaper off-peak hours.
- Keep filters clean and fix leaks promptly so the system runs efficiently.
One counterintuitive point: for regular users it is usually cheaper to keep the tub heated than to let it cool and reheat from cold, since reheating a large volume of water takes more energy than maintaining it. If your overall power bill is climbing, our guides on why your electric bill is so high and how to lower your electric bill put the hot tub in the context of your whole home.
FAQ
How much does a hot tub add to your electric bill per month?
Most owners see an increase of $20 to $60 a month, with well-insulated tubs at the low end and large or poorly insulated tubs in cold climates at the high end. Heating is the main cost.
Do hot tubs use a lot of electricity?
They use a meaningful amount, roughly 100 to 300 kWh a month, comparable to a water heater or a couple of window air conditioners. Most of it goes on maintaining water temperature rather than on the time you spend in it.
Is it cheaper to leave a hot tub on or turn it off?
For regular use, leaving it on at temperature is usually cheaper. Reheating a cold tub from scratch uses more energy than holding it steady. For long absences, turning it down or off can save.
How much does it cost to run a hot tub per day?
Roughly $0.70 to $2 a day for most tubs at average rates, depending on size, insulation and climate. Cold weather pushes the daily cost higher because the heater cycles more often.
Why is my hot tub using so much electricity?
Common causes are a worn or waterlogged cover, poor insulation, a temperature set too high, a faulty heater running continuously, or long filtration cycles. A bill far above $60 a month for an average tub is worth investigating.
Disclaimer: This article is general information, not financial advice. Electricity rates, hot tub models and usage vary widely, so figures are 2026 US averages for guidance only. Check your tub’s specifications and your electricity bill’s per-kWh rate for an accurate estimate.
