CALCULATOR · FREE免费 · Free
Pool Heater Calculator
Enter pool gallons, the temperature rise and the hours available to estimate the BTU and kW a heater needs.
--Heat required · BTU/hr
--Power · kW
Estimates only; verify on site before ordering or building.
Example
| Item | Value | Unit |
|---|---|---|
| Gallons | 20000 | gal |
| Temperature rise | 20 | °F |
| Hours | 24 | hours |
| Heat required | 138833 | BTU/hr |
| Power | 40.7 | kW |
Where people go wrong
- Ignoring heat loss; add 20 to 30 percent headroom when sizing.
- Entering °C where °F is expected.
- Sizing by BTU alone without checking gas, electrical capacity and flow.
FAQ
What size heater do I need?
Calculate first, then add 20 to 30 percent headroom; have a supplier confirm on site.
Why does heating take longer in practice?
Evaporation, overnight cooling and ground losses all remove heat.