Passing then through a condenser, which transfers the gas's heat to the cooler water coming from the other end of the heater device, the gas returns to liquid, and goes back to the evaporator to repeat the cycle. The water returns to the pool, dispersing through it and adding to the pool's overall warmth.What this means is that  swimming pool heat pumps work better than other kinds of inground heaters for pools, like the kinds that require solar panels. This is because, while they might initially cost a bit more than other heating solutions, their cost is less when seen in the long term because they are less effected by things like weather changes and the absence of sunlight. They're also likely to last a lot longer than such solutions, as they've been refined in their design over many years, while most other in ground pool heaters are in their technological infancy.

Swimming pool heat pumps don't make their own heat. Rather, they use electricity to catch heat and shift it from one place to another. The swimming pool's water is circulated through the pump, and as it does so the heat pump's fan draws in outside air, sucking it onto an evaporator coil, which holds a quantity of liquid refrigerant. This refrigerant substance becomes a warm gas when it absorbs the air, passing through a compressor and growing hotter as it's squeezed more tightly in its container.It's obvious that as with any machine that involves gas, heat coils and such, heat pumps for swimming pools are not things that you want installed in anything but the most professional manner. Make sure that the job's being done by someone with all the proper credentials (yes, there are pool professional credentials), preferably someone recommended to you by friends or family. Poor installation can mean that the pool pump won't operate optimally - you're going need someone that understands the physics and energy requirements of inground pool heaters.After this concern, you need to consider whether, regardless of the initial price of installation, you can afford to have a swimming pool heat pump running and eating up electricity. As efficiently as it may operate, if your kids are left unchecked running the heater they could well rack up phenomenal bills unless you establish some way to regiment the amount of power the device uses. Consider buying a pool pump timer to cut off power use at a particular number of kilowatt hours.

Source: Swimming Pool Heat Pump,   Heat Pump