Hayward Universal H-Series Propane Gas Heater 400,000 BTUs | W3H400FDPProduct Overview The Hayward Universal H Series Propane Gas Heater W3H400FDP is a powerful 400,000 BTU pool and spa heater designed to deliver fast, dependable, and efficient heating for residential in ground pool and spa applications. Built on Haywards Universal H Series platform, this heater combines strong propane heating performance with Low NOx emissions, flexible installation features, and durable construction for long lasting pool comfort.

✔️ Clear polycarbonate lid for easy device visibility

lower operating costs compared with many gas-heating setups

Q: Is installation plug-and-play

and easy local control in one advanced pool pump

this pump offers flexible voltage compatibility and built-in auxiliary relays for enhanced equipment control

Built with heat-management-focused construction to support long-term performance and reduce the stress commonly associated with high-output LED fixtures

and a stainless steel threaded shaft

and long cord provide unparalleled flexibility in design and control

A: It is a genuine Pentair OEM 4-pack replacement cartridge kit for Clean & Clear Plus 520 / CCP520 filters

display errors

high-performance pool circulation

1 × manifold baffle plate