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A. O. Smith’s Signature 500 Series 40-Gallon Power Vented Water Heater is designed to provide efficient and reliable hot water for households with 3 to 4 people when sized appropriately. Featuring an environmentally friendly 50000 BTU low NOx gas burner this model delivers 87 gallons of hot water in the first hour utilizing an electronic gas valve for precise temperature control that requires no external power source. An LED status indicator on the valve enables easy diagnostics reporting and push-button ignition to simplify startup. Count on this 40-gallon natural gas water heater for safe operation thanks to a built-in system that reduces risks of accidental flammable vapor ignitions. A factory installed temperature and pressure relief valve and tamper-proof drain valve also mitigate hazards during use. Built to last this model includes features Tank Guard which is designed to proivde ultimate tank protection and increase lifespan of the water heater. Want to save money on your energy bills This unit operates at a 0.70 Uniform Energy Factor UEF which can reduce your energy consumption compared to less efficient models. Call 1-877-GO to get this water heater installed same day.