Hayward Universal H-Series Propane Gas Heater 400,000 BTUs | W3H400FDP

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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.

Replacement or new-build part — useful for repairs

This model features white LED light output

easy maintenance

Replacing compatible older Pentair pool lights

improve sealing

and Hayward parts diagram before ordering

Helps improve water balance consistency

the IntelliChlor Plus40 is a strong replacement option for customers needing to restore chlorine production without replacing the entire salt system

creating a quieter pool equipment environment

this replacement cell is built for reliable operation and easy integration into existing compatible installations

Keep your pool equipment working like new with the Kreepy Krauly Replacement Cam kit for the Kreepy Krauly Great White Suction Side Pool Cleaner

this vacuum head ensures efficient cleaning of large pool areas