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- OT500LP2-H28OptiTherm modulating condensing high effeciency commercial water heater. Altitudes above 2,000 to 7,800 ft max. 119 gallons. 500,000 BTU/hr. LP Gas.NSF/ANSI Certified. UL ListedModel: OT500LP2-H28BTU: 500,000 (146.50)Gal: 119 gallonSKU: 55730-2