Hot Tub Electricity Cost Calculator
Find out exactly what your hot tub costs to run and how to reduce the bill.
Monthly Cost by Hot Tub Size & Climate
$0.16/kWh, average insulation, 3 hrs/week usage
| Size | Warm Climate | Moderate | Cold Climate |
|---|---|---|---|
| Small (2–4 person) | $81 | $129 | $190 |
| Medium (5–6 person) | $134 | $215 | $316 |
| Large (7–8 person) | $202 | $323 | $474 |
Frequently Asked Questions
How much electricity does a hot tub use per month?
A typical 6-person hot tub uses 3,000–7,500W for heating (total between heater and jets) and costs $50–$150/month to run at US average electricity rates. The exact cost depends heavily on the local climate (cold climates cost more to maintain temperature), hot tub insulation quality, cover quality, thermostat setting, and usage frequency.
How much does it cost per use to heat a hot tub?
Heating a hot tub from cold takes 2–4 hours and uses 6–15 kWh, costing $1–$2.40 at $0.16/kWh. But most hot tubs stay heated continuously, so the "per use" cost is the marginal heat lost during use (doors open, cooler body heat dissipation): roughly $0.50–$2 per session. The continuous standby cost dwarfs the per-use cost.
What is the biggest factor in hot tub running cost?
Insulation is the #1 factor. A well-insulated hot tub (full-foam insulation, R-15+) with a good cover (R-12+) can cost $40–$60/month in cold climates. A poorly insulated tub with a worn cover can cost $150–$200/month in the same climate. The cover degrades over 5–7 years as foam saturates with moisture — replacing it is the single best upgrade for reducing running costs.
How can I reduce hot tub electricity costs?
Keep the cover on when not in use (biggest factor), lower the thermostat 5–10°F when not planning to use it (Economy mode), use a timer to heat only before planned sessions, replace a waterlogged cover, add a floating thermal blanket under the cover, run jets less, and use a wind break or enclosure. Reducing setpoint from 104°F to 100°F saves ~10% on standby losses.
Should I turn off my hot tub when not in use?
No — constantly reheating from cold uses more energy than maintaining temperature, unless you're away for more than 2–3 weeks. Use "Economy" or "Sleep" mode when away for a few days, which maintains a lower temperature (around 80–85°F). When away for several weeks, drain and cover completely. Smart hot tub controllers let you schedule heating around planned use.