The Hayward W3H400FDN Universal H-Series is a cutting-edge 400,000 BTU natural gas pool and spa heater designed for optimal performance and energy efficiency. TS Pool Supply suggests this low NOx emission model features a standard cupro nickel heat exchanger, offering excellent resistance to salt water and chemical corrosion. Its patented header by-pass design and "Totally Managed" water flow system ensure uniform heating across all tubes, potentially reducing pump run-time by up to 18%. 

The heater comes with 2in x 2 1/2in CPVC union plumbing connections, adaptable to larger plumbing for greater efficiencies. With its high-performance capabilities and compliance with clean air quality standards, the Hayward W3H400FDN is an ideal choice for pool owners seeking a reliable, eco-friendly heating solution.

The Universal H-Series is an energy efficient, high performance, installation adaptable commitment to the pool service professional.

• Standard cupro nickel heat exchanger

• Excellent salt water and chemical corrosion resistance

• Exclusive "Totally Managed" cupro nickel heat exchanger water flow

• Same water velocity through all tubes for faster heating

• Patented header by-pass design

• Up to 18 percent savings by reducing pump run-time

• 2in x 2 1/2in CPVC union plumbing connections

• Common union for installation or service, adapts to larger plumbing recommended for greater efficiencies

• Low NOx emissions - meets clean air quality standards