Heat pumps systems are used because they provide an extremely efficient method to capture heat contained in the surrounding air, amplify this heat up to 6 times (COP) and transfer it to water. Heat Pumps provide one of the lowest cost of operation to maintain large volumes of water at a “constant” temperature.
It takes up to 4 times more energy to transfer heat to water, as opposed to air. When installed to an average size cold pool at 10-14 deg, a heat pump can take 2-3 days to heat the entire pool volume to the desired swimming temperature of approx 28deg. Once set temperature achieved the Heat Pump will automatically detect if the pool temp has dropped below the desired preset temp and start and stop to maintain a constant water temperature. This is where the efficiencies of operation really kick in.
In essence, Heat Pumps are the kind of pool heater that you leave switched on and are an excellent choice for those pool owners who want to swim, every day or most, if not all, of the year.
Gas pool heaters can heat large volumes of water, much faster, so are more commonly chosen for pools owners who want ‘on demand’ use of their pool. The cost of operation to maintain a constant pool temperature using a natural gas heater vs a high efficiency heat pump could be up to 50% more.