Description
The Hayward W3H400FDN Universal H-Series 400K BTU Natural Gas Heater is built for performance, offering fast and efficient heating for large in-ground pools and spas. Featuring a corrosion-resistant cupro-nickel heat exchanger and low NOx emissions, it’s ideal for environmentally conscious pool owners. The user-friendly digital LED control panel makes operation simple, while its energy-saving design ensures dependable heating all season long.









