Pool Heating Time Calculator
Estimate pool heating time and energy cost from water volume, desired temperature rise, heater input, efficiency and an editable heat-loss allowance.
Default project preview
17.3 hours
Thermal energy to water
367 kWh
Heater input energy
518 kWh
Average temperature gain
0.58 °F/hr
Heat-loss allowance
20%
Calculator
Build the material order
Your order will appear here
Enter the project details and calculate a rounded material estimate.
Input and output guide
What each value means
The labels and units below are part of this calculator’s visible methodology. Replace every default with measurements or product data from the actual project.
Pool water volume
Enter this project assumption in gal. The current imperial default is 15000 gal.
Desired temperature rise
Enter this project assumption in °F. The current imperial default is 10 °F.
Heater input power
Enter this project assumption in kW. The current imperial default is 30 kW.
Delivered heating efficiency
Enter this project assumption in %. The current imperial default is 85 %. Minimum: 1. Maximum: 100.
Heat-loss allowance
Enter this project assumption in %. The current imperial default is 20 %. Minimum: 0. Maximum: 100.
Energy price
Enter this project assumption in per kWh. The current imperial default is 0.18 per kWh. Minimum: 0.
How to read the outputs
Thermal energy to water
before efficiency and losses. Default preview: 367 kWh.
Heater input energy
85% efficiency. Default preview: 518 kWh.
Average temperature gain
idealized average rate. Default preview: 0.58 °F/hr.
Heat-loss allowance
editable weather and system allowance. Default preview: 20%.
Estimated energy cost
input energy × entered rate. Default preview: $93.17.
Heater input
entered continuous power. Default preview: 30 kW.
Methodology
Transparent calculation
BuildMeter converts every input to a consistent internal unit, applies the selected allowance, and rounds products up to whole purchasable units.
Water-heating energy is based on pool volume and temperature rise. Input energy accounts for efficiency and heat loss. Heating time = input energy ÷ heater power.
FAQ
Pool Heating Time Calculator questions
Why does a pool cover matter?+
Evaporation is a major source of heat loss. A suitable cover can substantially reduce the input needed during warm-up and maintenance.
Should heater output or input power be entered?+
Enter the energy input represented by the selected efficiency model. For equipment rated by delivered output, use 100% and add only the separate heat-loss allowance.
Does this include ongoing temperature maintenance?+
No. It estimates one warm-up event. Maintenance cost depends on continuing environmental heat losses.