How much does it cost to heat a pool?
The answer depends on rated heater input, runtime, operating days, utility price, weather, desired temperature, and pool conditions. Enter your equipment and rate assumptions for a planning estimate.
Last updated October 19, 2026
Pool Heating Cost Calculator
Estimate monthly pool heater operating cost from rated energy input, runtime, operating days, and your utility rate.
This calculator estimates pool heater operating cost only. It does not size equipment, predict heat-up time, or estimate installation.
Quick answer
Pool heating cost is driven by the heater's rated energy input, how many hours it runs, how many days it operates, and the local electricity or gas rate. Weather, covers, water temperature, equipment performance, and pool conditions can change actual runtime.
Pool heating operating cost calculator
Estimated monthly pool heating cost
- Low
- $41
- Typical
- $49
- High
- $56
Estimated monthly energy use
- Low
- 229.5
- Typical
- 270
- High
- 310.5
kWh
Operating allowance for 6 months
- Low
- $248
- Typical
- $292
- High
- $335
Calendar-month equivalent (season total / 12)
- Low
- $21
- Typical
- $24
- High
- $28
Main cost factors
- - Heating method: electric heat pump
- - 6 kW rated input
- - 3 operating hours per day
- - 15 operating days per month
- - $0.18 per kWh
This operating-cost estimate uses rated kW x hours x days x electricity rate. It does not estimate heat-up time, heater sizing, or installation.
Example monthly pool heating costs
| Item | Low | Typical | High | Notes |
|---|---|---|---|---|
| Electric heat pump example | $41 | $49 | $56 | 6 kW input, 3 hours/day, 15 days, $0.18/kWh |
| Gas heater example | $184 | $216 | $248 | 300,000 BTU/h input, 3 hours/day, 15 days, $1.60/therm |
What may be included
- - Electric heat pump or gas heater operating-cost estimate
- - Rated input, runtime, operating days, and utility rate
- - Low, typical, and high planning range
- - Selected operating months and calendar-month equivalent
What is usually not included
- - Heater purchase, replacement, or installation
- - Heat-up time or equipment sizing
- - Weather, cover, water-temperature, or efficiency simulation
- - Gas, electrical, wiring, ventilation, or equipment instructions
Electric pool heater cost per month
For an electric heat pump, the calculator multiplies rated electrical input in kilowatts by operating hours, operating days, and the entered electricity rate. Use the equipment's rated electrical input rather than thermal output.
Gas pool heater cost per month
For a gas heater, the calculator converts rated fuel input from BTU per hour to therms, then applies operating hours, days, and the entered cost per therm. Actual bills may include taxes, delivery, and fixed utility charges outside this estimate.
What affects the cost
- - Rated heater energy input
- - Daily runtime
- - Operating days per month
- - Electricity or gas rate
- - Weather and target temperature
- - Pool cover and equipment performance
Operating cost vs heater purchase cost
Operating cost and equipment price answer different questions. Use this calculator for energy spending, the heater repair page for a diagnosed repair budget, and equipment replacement ranges when comparing a new unit.
How to compare quotes
- - Confirm whether a quote is for equipment or operating cost
- - Use the rated energy input from equipment documentation
- - Check utility rates on a recent bill
- - Compare repair, replacement, and energy spending separately
Methodology for this estimate
Electric estimates use electrical kW input x hours per day x operating days x USD/kWh. Gas estimates use fuel-input BTU/h x hours x days / 100,000 x USD/therm. Multiply monthly cost by the entered operating months for a season; divide the season total by 12 for a calendar-month equivalent. Low/high are illustrative +/-15% sensitivity, not measured uncertainty or normal variation. This repeats your schedule and does not model changing weather, heat loss or heat-up time. Do not enter thermal output as energy input.
Energy units and estimate limits
The energy calculation uses entered power, time, and utility rates. The U.S. Energy Information Administration defines a kilowatt-hour as 1,000 watts used for one hour. Where low/high are shown, they are illustrative sensitivity scenarios, not measured error bounds.
Important disclaimer: Estimates are for planning only and are not contractor quotes. Pool Cost Planner does not provide chemical handling, mixing, dosing, electrical, gas, structural, or repair instructions. For safety issues, code questions, repairs, or winterizing in freezing climates, contact a qualified pool professional.
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FAQ
Does this calculator estimate heat-up time?
No. It estimates energy cost from an assumed runtime and does not model water volume, heat loss, weather, or heater sizing.
What is the difference between rated input and heating output?
Rated input describes energy consumed and is the value used for this cost estimate. Heating output is not interchangeable with electrical input or gas fuel input.
Does the gas estimate include fixed utility charges?
No. It applies the entered cost per therm to estimated fuel use. Taxes, delivery fees, minimum bills, and fixed charges may be separate.
Does this page provide gas or electrical instructions?
This page estimates costs only. Do not use it as repair, gas, electrical, leak, structural, or code guidance; call a qualified professional for diagnosis and work.