Hayward Universal H-Series Natural Gas Heater 400K BTU | W3H400FDNProduct Overview The Hayward Universal H Series Natural Gas Heater W3H400FDN 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 natural gas performance with Low NOx emissions, flexible installation features, and durable construction for long lasting pool comfort.

Warranty Listed by Distributor 1 Year UPC / Barcode 052337070898 SKU PSB215 Distributor Product Number JDY-85-8039 Installation Type Professional installation recommended Check Valve Requirement Use an accessible 1/2 lb

No backwashing required — cartridges can be removed and rinsed clean

it will not generate chlorine

000 gallons Chlorine Output Approximately 1

confirm the existing cleaner style

Durable replacement assembly for pool and spa pump maintenance

pump rebuild Shaft Seal Type Salt / ozone-resistant shaft seal assembly Seal Plate O-Ring 355619Z Shaft Seal Assembly 356210S Diffuser O-Ring 355030Z Strainer Pot Lid O-Ring 357255Z Drain Plug O-Rings 192115Z

IntelliChem helps reduce manual testing

Q: What is the AVCS 285001

leak checks

consistent performance in high-demand environments

and WhisperFlo pump applications using 2" plumbing connections