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O. Smith Signature 500 Series 50-gallon power vent water heater. It provides efficient reliable hot water when appropriately sized with its environmentally friendly 40000 BTU ultra low NOx gas burner delivering 79 gallons in the first hour. For your convenience the gas valve also includes an LED status indicator for diagnostics reporting and a push button ignition to simplify the startup process. Designed with your protection in mind this A. O. Smith 50-gallon gas water heater includes a built-in safety system that reduces the risk of accidental flammable vapor ignitions. A factory-installed temperature and pressure relief valve and tamper-proof drain valve also ensure safe operation. To reduce corrosion and better protect the tank and extend the lifespan of the water heater this model features Tank Guard . This model operates at a 0.72 Uniform Energy Factor which can reduce your energy consumption compared to less efficient models. Call 1-877-GO to get this water heater installed same day.