W3H400FDP Hayward 400K Btu Univ H Series Lp Low Nox

W3H400FDP Hayward 400K Btu Univ H Series Lp Low Nox

Marsoni

M251S

$2549.50

Get it in 3 business days with 1 day shipping. Friday, May 29

W3H400FDP Hayward 400K Btu Univ H Series Lp Low NoxHayward W3H400FDP Universal H Series 400,000 BTU Propane Pool and Spa Heater for In Ground Pools and Spas

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Great fit, and lot more more robust in build than the OEM filter it replaces. I've replaced the factory cabin air filters in at least 3 vehicles with these, when the time came to replace. Side note: This one went into a 2020 Lincoln Aviator and --consistent with my experience with previous Lincoln models -- the retaining tabs on the filter housing door snapped off when I was trying to remove it. Nothing to do with the K&N filter, but I just don't understand why Lincoln can't design a better housing door mechanism.

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Reviewed in the United States on September 16, 2025