Hayward W3H135FDN Universal H-Series Natural Gas 135,000 BTU Low NOx

Hayward W3H135FDN Universal H-Series Natural Gas Pool Heater – 135,000 BTU Low NOx

The Hayward Universal H-Series W3H135FDN is a 135,000 BTU natural gas pool heater engineered for efficient, reliable heating of residential in-ground pools and spas. Designed with industry-leading hydraulic performance and energy efficiency, this heater delivers fast heat-up times while helping reduce circulation pump run time.

Built with a corrosion-resistant Cupro-Nickel heat exchanger and advanced combustion technology, the Universal H-Series heater provides long-term durability even in saltwater or chemically demanding pool environments. The compact, universal-fit cabinet allows flexible installation on new or existing equipment pads. :contentReference[oaicite:0]{index=0}

Reliable Heating with Low NOx Emissions

The Universal H-Series Low NOx heater is engineered to meet strict environmental emission standards while maintaining powerful heating performance. Its fan-assisted combustion system ensures consistent heating regardless of wind conditions, while the digital control interface allows precise temperature management and system diagnostics.

Key Features

• 135,000 BTU natural gas heating capacity
• Universal H-Series Low NOx emissions design
• Cupro-Nickel heat exchanger for corrosion resistance
• Electronic ignition with digital control panel
• Fan-assisted combustion system for consistent performance
• Polymer header improves hydraulic performance
• 2 in x 2.5 in CPVC union plumbing connections
• Designed for residential in-ground pools and spas