Hayward Universal H-Series Natural Gas HeaterThe Hayward Universal H Series Natural Gas is a high performance pool water heater that is energy efficient and is installation adaptable. Using a durable Cupro Nickel Heat Exchanger, water flow is managed consistently without the worry of corrosion. This pool heater will reduce the run time of pumps by up to 18% with the water velocity that the H Series can provide. Model BTU Low NOx W3H150FDN 150,000 Yes W3H200FDN 200,000 Yes W3H250FDN 250,000 Yes
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