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Home >> Pool Heaters >> Hayward W3H400FDN H Series 400K BTU

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Hayward W3H400FDN
H-Series 400K BTU

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Hayward W3H400FDN Manual


The Hayward H-Series W3H400FDN Natural Gas Pool and Spa Heater is environmentally friendly and energy efficient. Boasting an industry leading 84 percent thermal efficiency the environmentally friendly H-Series complies with all current California and Texas air quality emission standards. It is also the only pool heater to offer Cupro Nickel heat exchangers standard on all models. Cupro-Nickel is designed to withstand the harshest pool environments like low pH, high flow and heavy pool use and is also recommended for all pools using salt systems.

Other features that help the H-Series Heater outperform other brands include stainless steel burners, corrosion-resistant Finn Plate heat exchangers with Cupro Nickel and insulated Fire Tile combustion chambers. The combustion chambers trap heat unlike other forms of insulation and help higher degree of performance from every BTU. The user friendly LED control panel monitors performance for added convenience and maximum comfort with minimum effort. The dependable ignition system delivery reliable operation with the push of a button while the forced draft system in constantly moving air throughout the combustion chamber eliminating all outside weather variables.


  • For In-Ground Pools and Spas

  • Electronic Ignition Dual Thermostat

  • 400K BTU Natural Gas (NG)

  • Cupro Nickel Heat Exchangers

  • Easy-to-read L.E.D. digital Control Panel

  • New polymer header provides superior hydraulic performance

  • Larger diameter plumbing systems with 2" x 2 1/2" CPVC unions

  • Meets the NOx Emission standards

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