Pool heating cost is pump kWh plus grid kWh to replace heat lost to evaporation—not just the heater sticker. This guide walks through the pool heating cost calculator: pump power, run hours, electricity rate, heating method, COP, and optional thermal cover savings.
Benefits
- Separates pump energy from heating energy so you see what the heater actually costs.
- Compares resistance (COP 1) vs. heat pump (COP 4–6) on the same thermal load.
- Models thermal cover savings on heat demand—typical 30–50% less evaporation loss.
How it works
- Enter pool pump kW, daily run hours, and your $/kWh electricity rate.
- Choose electric resistance or heat pump heating and set COP for the heat pump case.
- Toggle thermal cover and pick a savings % to see daily cost and annual heating savings.
FAQ
How do I calculate pool heating cost?
Daily heating grid kWh ≈ heat demand ÷ COP. Resistance COP = 1; heat pumps often COP 4–6. Add pump kWh = pump kW × hours/day. Daily cost = (pump kWh + heating kWh) × $/kWh. Example: 12 kWh thermal load, COP 5 heat pump → 2.4 kWh heating + 12 kWh pump at 1.5 kW × 8 h → 14.4 kWh/day × $0.14 ≈ $2.02/day.
Heat pump vs. electric resistance for pool heating?
Resistance delivers 1 kWh of heat per kWh of electricity. A heat pump moves heat from ambient air into the water, so the same comfort often needs 4–6× less grid energy. The calculator shows monthly heating cost for both methods on the same load so you can see dollars saved switching to a heat pump.
Does a thermal cover reduce pool heating cost?
Yes—covers cut evaporation, which is the largest heat loss on many outdoor pools. Savings apply to thermal load, not pump kWh. Typical blankets save 30–50% on heat demand; enter your cover type in the calculator to see annual $ saved alongside heating technology choices.
Technical specifications
- Daily pump kWh = pump_kW × hours/day.
- Heating grid kWh = heat_demand_kWh ÷ COP (1 for resistance, 4–6 for heat pumps).
- Cover reduces heat demand by selected % before COP is applied.
- Related: pool-energy-thermal-cover, heat-pump-vs-resistance, ac-inverter-savings.
Pump kWh and heater kWh are separate lines
A 1.5 kW pump running eight hours adds 12 kWh/day whether the water is 68 °F or 82 °F. Heating cost comes from replacing heat lost—mostly evaporation on an open pool. The calculator keeps pump and heating math separate so you do not blame the pump for heater bills or vice versa.
COP is the lever on heating dollars
Resistance heaters stay at COP 1: every kWh on the meter becomes one kWh in the water. Pool heat pumps commonly run COP 4–6 because they transfer ambient heat instead of creating it. On the same thermal load, COP 5 cuts grid kWh to one-fifth of resistance—dollar savings scale with your $/kWh rate.
Covers lower the load before COP applies
A thermal blanket reduces evaporation heat loss—often 30–50% depending on fit and climate. That savings hits heat demand first; then COP converts the smaller load to grid kWh. Pump hours stay the same, but heater run time and cost drop. Model both upgrades together to see combined annual savings.