Rough runtime by gallons + temp rise + BTU/hr
This calculator estimates how long a pool heat pump may need to raise the water temperature by a selected number of degrees. Enter the pool volume, desired temperature increase, and the heat pump’s rated BTU output. The result shows an estimated number of hours and days.
The calculation assumes steady output and does not subtract heat lost to the air, wind, ground, or evaporation. Real heating time is often longer.
Heat pumps move heat from the surrounding air into the pool. Their output changes with air temperature, humidity, water temperature, and airflow. A unit that produces its rated BTU output on a warm, humid day may produce much less during cool or dry weather.
Evaporation is one of the largest sources of pool heat loss. A cover helps retain heat, reduce evaporation, and shorten the time needed to reach and maintain the target temperature.
Heat pumps usually heat more slowly than gas heaters. They are often better suited to gradual heating and temperature maintenance.
Cooler air and increased heat loss reduce heating performance. An uncovered pool may lose much of the heat gained during the day.
A higher-BTU unit can usually add heat faster, but actual performance still depends on weather, water flow, equipment condition, and heat loss.
No. This tool estimates runtime. Use the Electric Cost Calculator with the heat pump’s wattage and expected runtime to estimate operating cost.
A heat pump works best when you give it time and keep the heat you already paid for. Cover the pool whenever possible instead of repeatedly reheating lost water temperature.