Hayward 250,000 BTU Natural Gas Electronic Ignition H-Series Heater Hayward H-Series heaters feature a wealth of advances to deliver precision water temperature control and achieve the ideal swimming pool and spa comfort level. The Hayward H-Series heater represents the very latest in heating technology for swimming pools and spas. Advanced features include digital LED control panels on all electronic direct spark and induced draft hot surface heaters, a rust-resistant water path with polymer header assemblies, and a rapid-heat combustion chamber. H-Series heaters are easy to install and maintain, thanks to its low profile, lightweight and CPVC plumbing capabilities. In addition, all Hayward H-Series heaters are all equipped with a Cupro Nickel Heat Exchanger for efficient heating and superior durability. Cupro Nickel provides improved durability and longevity against the damaging effects of erosion that can occur under high-flow conditions, corrosion from occasional pool chemical imbalances, and is ideal for salt-water based pool systems. For extra protection, the cupro nickel material has been coupled with an improved flow rate by-pass control. Together, these added technological improvements ensure that your Hayward heater outperforms and outlasts expectations. Features Patented single header "V" baffle design heat exchangers allow for long life, fast heating and virtually no condensation. All Hayward heat exchangers are now constructed with highly resilient Cupro Nickel for greater durability and longevity. Easy-to-read L.E.D. Control Panel provides digital temperature readout and diagnostics for quick identification of components that might need service. Rust resistant water path, with injection-molded polymer header, offers improved by-pass control and extended life by providing additional protection from the damaging effects of erosion from high flow conditions.