Garden & Outdoor calculator
What Pool Heater Size Do I Need?
Use pool surface area, desired water temperature rise, site heat-loss coefficient to find pool heater power.
Enter your measurements
What Pool Heater Size Do I Need uses pool surface area, desired water temperature rise, site heat-loss coefficient and the other configured measurements to return pool heater power with a formula written specifically for this tool.
- Pool surface area — Required
- Desired water temperature rise — Required
- Site heat-loss coefficient — Required
- Cover heat-loss reduction — Required
Pool heater power
Enter the measurements above to calculate pool heater power.
How the calculation works
V9 calculation: requiredPower=poolSurfaceArea×temperatureRise×heatLossCoefficient×(1-coverReduction). The result is reported as pool heater power.
Worked example
Example: Pool surface area = 24 m²; Desired water temperature rise = 20 °C; Site heat-loss coefficient = 50 W/m²·K; Cover heat-loss reduction = 30%. Result: Required Power = 16800 W.
Before you decide
Enter the dimensions that will exist in real use, not an approximate catalogue category. This page calculates the stated geometry or quantity only; product-specific construction or installation details can still affect the final choice. For what pool heater size do i need, the limiting result on this page is pool heater power.
Direct measurement/geometry calculation. No external reference is required for the arithmetic itself; the result is derived only from the user-entered measurements and the formula stored in calculationLogicJson.
Frequently asked questions
What does the Pool Heater Size calculator tell me?
It returns pool heater power from the measurements entered on this page. The calculation is specific to pool heater size, so the result should be compared with the exact product or specification you are considering.
Which measurements should I take for pool heater size?
Measure pool surface area, desired water temperature rise, site heat-loss coefficient, cover heat-loss reduction. Use clear, usable dimensions rather than nominal room or product labels.
Should I round the pool heater power?
Keep the calculated value for comparison, then choose a real product that meets or stays within the returned pool heater power while allowing for the clearances, tolerances or ratings shown by its manufacturer.