Hayward – W3H400FDN Universal H-Series, Low NOx, 400K BTU, Natural Gas, Pool & Spa Heater

• “Totally Managed” Flow saving energy by reducing pump run time
• Silicon Nitride Ignition System
• Cupro-Nickel Heat Exchanger ensures compatibility with almost all pool systems including salt pools
• Low NOx certification
• 83-84% industry-leading thermal efficiency
• Patented header by-pass design
• Corrosion resistance
• Digital LED display
• High and low voltage options (110V or 220V)
• 3/4″ Gas Connection at heater
• Choice of left-side or right-side electric, gas and water connections (delivered right-side by default)
• 2″ or 2-1/2″ plumbing connections
• Important: Instructions for Accepting Your Freight Shipment

Installation Instructions:

• Verify compatibility between the pool heater and your existing pool equipment.
• Ensure the surface is level and stable, and has enough ventilation (especially for gas heaters).
• Match and attach the inlet and outlet pipes of your pool pump to the pool heater.
• May require a certified technician to meet safety regulations and codes.
• Please reference additional installation instructions in the owner’s manual located in the Guides and Documentation section below.
• Please Note: We recommend professional installation or the manufacturer warranty may be void. See Warranty section below.