How much electricity does a hot tub use?
Quick answer
A typical hot tub uses roughly 150 to 300 kWh a month to hold temperature, very roughly 20 to 60 dollars at average US power prices, but the spread is wide because it depends on your cover, set temperature, climate, and insulation. Most of that is standby heat loss, the energy to replace what leaks out while the tub sits idle, not the soaks themselves. Put your own numbers in for a real figure.
The honest answer to this question is a range, because two tubs at the same temperature can cost very different amounts depending mostly on their covers. Here is what drives it, and how to get your number.
What drives the cost
Almost all of a hot tub's power bill is standby heat loss: the heater replacing warmth that escapes through the cover and cabinet while the tub is just holding temperature. The levers, in rough order of impact:
- The cover. A tight, dry, well-fitting cover is the single biggest factor. A waterlogged or loose cover can add far more to the bill than any other cause.
- Set temperature. Heat loss rises with the gap between the water and the air, so every degree you hold costs more, especially in winter.
- Climate and season. A cold, windy location loses heat faster than a mild one, so the same tub costs more in January than July.
- Insulation. A full-foam or well-insulated cabinet holds heat better than a thin-walled or inflatable tub.
- Pump runtime. Filtration and jet pumps add on top of heating, though heating is usually the larger share.
Turn kWh into dollars
The math is simply your monthly kWh times your electricity price per kWh. These illustrative bands use a 0.17 dollar per kWh rate; swap in your own rate, which is on your power bill.
| Setup | Rough kWh / month | At 0.17 / kWh |
|---|---|---|
| Well kept: tight cover, mild climate | 120 to 180 | about $20 to $30 |
| Average tub and cover | 180 to 260 | about $30 to $45 |
| Poor cover or cold climate | 260 to 400+ | about $45 to $70+ |
Illustrative ranges, not a quote. The running cost calculator estimates your tub from its size, your set and outdoor temperatures, your cover, and your actual rate.
How to cut it
- Fix the cover. Replace a waterlogged or ill-fitting cover; it usually pays for itself in saved standby loss. Condition the vinyl so it lasts.
- Drop the set temperature a few degrees, especially for stretches you are not using it; loss scales with the temperature gap.
- Add a floating thermal blanket under the cover for an extra layer.
- Shelter it from wind, which strips heat off the cover and cabinet.
- Use any economy or off-peak schedule your pack offers to heat when power is cheaper.
What helps
Since the cover is the biggest lever, a tight replacement cover and a conditioner to keep it from soaking up water do more for the bill than anything else.
Get hot tub cover Get cover conditioner
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Common questions
How much does it cost to run a hot tub per month?
Very roughly 20 to 60 dollars a month for a typical tub at average US power prices, but it ranges widely with your cover, set temperature, climate, and insulation. A well-covered tub in a mild climate sits at the low end; a poor cover or a cold winter pushes it higher. The run-cost calculator estimates yours.
Is it cheaper to turn a hot tub off between uses?
Usually not for normal gaps. Reheating a large mass of water from cold takes a lot of energy, so for frequent use it is most efficient to hold temperature with a good cover. For long absences, turning it down several degrees saves more than people expect, and turning it fully off only pays for very long stretches.
Why is my hot tub electricity bill so high?
The most common culprit is the cover. A cover that has soaked up water loses its insulation and lets heat pour out, so the heater runs far more. Frequent soaking with the cover off, a high set temperature, wind exposure, and a cold climate all add to it.