What does a jetted walk-in tub cost to run? Work it out with your own numbers
Direct answer: the jets are cheap to run; the hot water is not. Using the Ella’s Bubbles Deluxe spec sheet (1,000 W water pump, 500 W air blower, 650 W inline heater) for 15 minutes each, the motors use about 0.54 kWh, roughly 10¢ a bath at the U.S. average of 18.31¢ per kWh. Warming a 60-gallon fill from 55°F to 100°F with an electric water heater takes about 7.2 kWh, or $1.31. That is about $1.41 a bath, and 93% of it is hot water.
Reviewed October 15, 2026. Default rate: 18.31¢/kWh, the U.S. average residential price for July 2026 in the EIA’s Electric Power Monthly (Table 5.6.A, released September 24, 2026). Your own bill is the better number; type it in below.
Operating cost calculator
Start with an example tub or type your own figures from the spec sheet. Everything updates as you type.
Electricity for the motors and heater
Hot water to fill the tub
Show the formula with my numbers
The formula, in plain words
Electricity is sold by the kilowatt-hour (kWh). One kWh is 1,000 watts running for one hour. So for each motor:
For hot water, it takes 8.34 BTU to warm one gallon of water by one degree Fahrenheit (a gallon of water weighs about 8.34 pounds). One kWh equals 3,412 BTU, and one therm of gas equals 100,000 BTU. The water heater wastes some heat, so we divide by its efficiency:
A worked example
Take the Ella Deluxe figures with a 60-gallon fill (the low end of its 60–75 gallon occupied capacity), 55°F incoming water, a 100°F bath, an electric tank heater at 0.92 efficiency and 18.31¢/kWh:
| Part | Math | Per bath |
|---|---|---|
| Water jets | 1,000 W × 15 min = 0.25 kWh | about 5¢ |
| Air jets | 500 W × 15 min = 0.125 kWh | about 2¢ |
| Inline heater | 650 W × 15 min = 0.16 kWh | about 3¢ |
| Hot water | 60 × 8.34 × 45 = 22,518 BTU ÷ 3,412 ÷ 0.92 = 7.17 kWh | about $1.31 |
| Total | about 7.7 kWh | about $1.41 |
At three baths a week that is about $18 a month or $220 a year. The motors are about 7% of it. That surprises most people, and it changes where savings come from.
| Part | Cost per bath | Share |
|---|---|---|
| Hot water | $1.31 | 93% |
| Water-jet pump | $0.05 | 3% |
| Inline heater | $0.03 | 2% |
| Air blower | $0.02 | 2% |
| Part | Cost per bath | Share |
|---|---|---|
| Hot water | $1.31 | 93% |
| Water-jet pump | $0.05 | 3% |
| Inline heater | $0.03 | 2% |
| Air blower | $0.02 | 2% |
Where the savings really are
- Fill only as high as you need. Every 10 gallons you skip saves about 22¢ in the example. With water jets you still need the level above the top jet, which the Ella manual calls the waterline.
- Take a slightly cooler bath. Dropping from 102°F to 98°F cuts the temperature rise, and the hot-water cost, by close to 9% when the incoming water is 55°F.
- Keep the water heater at a safe setting. The U.S. Consumer Product Safety Commission has long recommended 120°F at the water heater to prevent scalds, and older adults are among those most at risk. Hotter storage does not make a bath cheaper; it just raises scald risk and standby loss.
- Do not worry much about jet minutes. Running a 1,000-watt pump 10 extra minutes costs about 3¢ at the default rate.
- Mind the season. Cold water arriving at 45°F instead of 70°F nearly doubles the hot-water cost of a 60-gallon fill: about $1.61 against $0.88 in the example.
- Compare to a hot tub fairly. A backyard spa keeps its water hot around the clock; heating sites put typical spa electricity at about $30–$100 a month. A walk-in tub is filled and drained each bath, so it has no standby heating, but it pays to heat fresh water every time.
Make sure your water heater can keep up. Cost is one question; having enough hot water to fill the tub is another. A guide on our sister site explains how to tell if your water heater is big enough. Remember that an inline heater holds temperature during the bath; it does not heat cold water.
How to find your tub’s watts
- The spec sheet. Search the model name plus “spec sheet.” Look for pump, blower (air) and heater lines.
- Amps instead of watts? Multiply amps by volts. A 5-amp pump on 120 volts is about 600 watts.
- Horsepower? One horsepower is about 746 watts, so a 0.5 HP motor is roughly 373 watts of output (it draws a bit more).
- The label on the motor. Your installer can read it from the access panel.
Want the real numbers for a tub you are considering? Ask us for the spec sheet with your written quote. Aging Safely Baths is BBB accredited, and we are glad to send spec sheets before you decide anything.
Questions people ask
Is a jetted walk-in tub expensive to run?
Usually not. In our worked example, one bath costs about $1.41, and 93% of that is heating the fill water. Your cost depends mostly on gallons, water temperatures and your energy prices. Use the calculator with your own numbers.
Does the inline heater use a lot of power?
A typical inline heater on a walk-in tub is rated in the hundreds of watts; Ella’s Bubbles lists 650 W on most models and 1,000 W on the Ultimate. Fifteen minutes at 650 W is about 0.16 kWh, roughly 3¢ at the U.S. average rate.
How do I find my electricity rate?
Divide the total electric charges on your bill by the kWh you used that month. That “all-in” rate includes delivery fees and is the most honest number to use.
Why does the calculator ask about incoming water temperature?
Your water heater has to warm the cold supply up to bath temperature. Water arriving at 45°F in a cold climate needs more energy than water arriving at 70°F. That single number can swing your hot-water cost by a third.
Will a heat pump water heater lower the cost?
Heat pump water heaters move heat rather than make it, so their efficiency rating is well above 1. Choose that type in the calculator and type the UEF from your heater’s spec sheet to see the effect.
Want a second opinion on a jetted tub?
Tell us about your bathroom and what hurts. A specialist from Aging Safely Baths will give you an honest written quote. There is no deadline and no pressure, and you are welcome to compare us with anyone.
Sources
- U.S. Energy Information Administration, Electric Power Monthly, Table 5.6.A: U.S. average residential price 18.31¢/kWh in July 2026 (17.45¢ in July 2025).
- Ella’s Bubbles spec sheets: Deluxe and Ultimate (dealer copies), Escape and Companion (PDF): pump, blower, microbubble and in-line heater ratings and occupied capacity.
- U.S. Consumer Product Safety Commission, tap water scald guidance (120°F setting): cpsc.gov (PDF)
- Direct Energy, “How much electricity does a hot tub use”: directenergy.com
- ConsumerAffairs, “Do walk-in tubs have heaters” (inline heaters keep water warm; they do not heat cold water): consumeraffairs.com