We here at Poolheatpumps.com field customer questions everyday about their pool heating needs. Today, a gentleman, who is doing his research on the pool heater that will best suit his needs, asked me if there are many pool owners who use both a pool gas heater and a pool heat pump, and if they do, why?
I replied yes, it does happen. Why would someone have that kind of setup? The pool gas heater will raise the pool water temperature in hours, where as the pool heat pump might take multiple hours to get to your desired water temperature. Now once you have achieved your desired water temperature using the pool gas heater, take advantage of the money saving qualities of a pool heat pump and use the pool heat pump to maintain that temperature. Operating a pool gas heater will almost always be more expensive than operating a pool heat pump, but if time is of the essence the pool gas heater wins.
Next question by the same gentleman had to do with the plumbing configuration of two heaters, and the location of one heater to the other. Location of the heaters relative to one another is not a big factor. Location of the pool heat pump relative to any walls or obstructions is important. The pool heat pump is using the surrounding air to derive its heat, thus, it should be in as open a place as possible. As to the plumbing, once the water circulates through one pool heater it should return to the pool. You do not want a situation where the water circulates through one pool heater and then through the other pool heater. I am posting a picture of two Heat Siphon Z700 pool heat pumps plumbed to heat one pool. Notice the upper PVC pipe brings water into the heat pump and the lower PVC pipe takes water to the pool. Shut off valves keep water from flowing into the heater not in use.
Well tomorrow will bring another question and we will be here to help answer it.