Hayward FD Heater Bypass Cartridge Kit | FDXLBPK1930 Description This bypass cartridge kit is designed for select Hayward Universal H-Series Low NOx pool and spa heaters It allows the heater to bypass the standard flow path when required, maintaining proper flow and operation while extending system life
How to Bypass Your Hayward Pool Heater in 3 Simple Steps The first step is to locate your pool heater’s bypass valve, which will allow you to redirect the water flow around the heater This valve is usually located near the inlet and outlet pipes of the heater, but you may need to refer to your owner’s manual to find it