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- ODOT500N2-AOptiTHERM Outdoor modulating, condensing high-efficiency commercial water heater • UL Listed for outdoor use in dry, warm climates • 125 gallon • 500,000 BTU/hr • Natural Gas • ASME certified • NSF/ANSI certifiedModel: ODOT500N2-ABTU: 500,000 (146.50)Gal: 125 gallonSKU: 55860-2