Cost to run

How much does a hot tub cost to run?

A hot tub pays two bills: reheating water after use and constantly replacing heat that leaks through the shell and cover. Climate and cover quality change the total more than soak time does.

Content reviewed 2026-07-15 · Rates published 2026-09-24 · methodology appliance-energy-1.0.0 · data vintage 2026-07-ytd

Using the moderate climate assumptions below, electricity costs about $0.99 per day of use and $29.81 for 30 days of use at the Texas average rate. Adjust the calculator for your equipment and schedule.

Example costs using the Texas state-average rate

These are generated examples for a consistent location. Enter your own ZIP and usage below for a more relevant state-average estimate.

Scenario	Assumption	kWh/month	Cost/day of use	Monthly range	Cost at 365 days/year
Warm climate, good cover	Heater averaging 2 hours a day 3750 W × 2 h/day × 0.5 duty × 30 days × 1 unit(s)	112.50	$0.60	$11.97–$26.71	$219.82
Moderate climate	Heater averaging 3 hours a day 3750 W × 3 h/day × 0.55 duty × 30 days × 1 unit(s)	185.62	$0.99	$19.75–$44.07	$362.71
Cold-winter outdoor tub	Heater averaging 5 hours a day in freezing weather 4000 W × 5 h/day × 0.65 duty × 30 days × 1 unit(s)	390.00	$2.09	$41.49–$92.60	$762.05

Wattage, runtime and duty cycle below are illustrative assumptions, not measurements of a particular model. Annual figures assume use on all 365 days; monthly figures use each scenario's stated number of days.

Source: U.S. Energy Information Administration, Electric Power Monthly Table 5.6.B. Data vintage 2026-07-ytd. State-average pricing is not your exact utility tariff.

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Standby heat loss is the real bill

Most hot-tub energy goes to holding temperature between soaks, not to the soaks themselves. Heat escapes continuously through the cover, shell, and plumbing, so the heater cycles all day whether anyone uses the tub or not.

The cover is the cheapest upgrade

A waterlogged or sagging cover can multiply standby losses, since most heat leaves through the water surface. Replacing a failed cover or adding a floating thermal blanket often cuts more cost than any settings change.

Climate, voltage, and model limits

Freezing air and wind strip heat faster, which the winter scenario approximates with longer heater hours. Plug-in 120-volt tubs heat slowly with smaller elements, and circulation pumps, jets, lights, and ozone systems add draw this heater-focused model folds into its averages.

Frequently asked questions

Should I lower the temperature between uses?

For gaps of a day or two, holding temperature under a good cover is usually comparable to reheating from lower. For longer idle stretches, lowering the setpoint saves clearly.

Why did my hot tub cost jump in winter?

Heat loss scales with the temperature gap between water and air. Freezing weather forces the heater to run several times the summer hours, exactly as the scenarios contrast.

Do jets and lights add much to the bill?

Jet pumps draw heavily but only during soaks; lights and controllers are minor. The dominant term remains standby heating, which cover quality controls.

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