Swimming Pool Heating Time Estimate
123 Pools Heat Pump Calculator
Estimate heat-up time from your pool size, temperatures, and heat pump performance.
UK Weather (optional)
Idle
Water temperature
Set your starting and desired temperatures. Day and night air temps, if provided, help adjust performance.
Pool details
Volume is calculated automatically. Units can be meters or feet.
Above ground pools lose more heat through the side walls. Based on observed cases, heating time can be about 3.6× longer than inground for the same setup.
Heat pump
We auto‑calc Output at 15 °C as 65% of Max. Actual outputs are estimated from your forecasted average day and night air temperatures.
Operation
We blend day and night heater output using these hours to estimate an effective kW. Max 12 hours each, 24 hours total.
Heating a pool is not perfectly linear. Treat this as a guide.
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