Pool Heater Calculator & Heat Pump Sizing

Why solar has a real operating cost Solar collectors are essentially free to run on sunny days — but your pump has to circulate water through the roof collectors for 6–10 hours a day, versus 2–4 hours for a heat pump. That extra pump runtime adds up. In Florida, where you'd heat more months of the year, expect $300–$600/year in additional pump electricity. That's what the "Solar" figure above reflects.