Hayward H-Series LowNOx Heater - Electronic Natural - 250,000 BTU Features and Benefits Universal, energy-efficient pool and spa heater Polymer header enhances hydraulic performance, saving energy and protecting against erosion damage Forced draft system moves air through combustion chamber at precise flow rate, eliminating outside weather variables affecting the heating performance Patented single header "v" baffle design heat exchangers allow for long life, fast heating and virtually no condensation State-of-the-art fin plate heat exchanger with cupro nickel Easy-to-read LED control panel provides digital temperature readout and diagnostics for quick identification of components that might need service