The Hayward W3H400FDP, part of the Universal H-Series, is a cutting-edge 400,000 BTU propane pool and spa heater designed for superior performance and efficiency. TS Pool Supply proposes this low NOx model features a standard cupro nickel heat exchanger, offering excellent resistance to salt water and chemical corrosion – a crucial factor for long-term durability. The heater's patented header by-pass design and "Totally Managed" water flow system ensure uniform heating across all tubes, resulting in faster heating times and up to 18% energy savings through reduced pump run-time. 

With its 2-inch x 2.5-inch CPVC union plumbing connections, the W3H400FDP adapts easily to larger plumbing systems, enhancing overall efficiency. Moreover, its low NOx emissions meet stringent clean air quality standards, making it an environmentally responsible choice for eco-conscious pool owners.