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Get efficient reliable hot water for households with 3 to 4 people when appropriately sized with this A. O. Smith Signature 500 Series 40-gallon propane power vent water heater. Featuring an environmentally friendly 50000 BTU ultra-low NOx gas burner this model delivers 87 gallons of hot water in the first hour. An LED status indicator for diagnostics and reporting on the gas valve adds extra convenience while the push-button ignition simplifies the startup process. Count on this A. O. Smith 40-gallon propane water heater with power vent for effortless operation thanks to the built-in safety system that reduces potential risks from accidental flammable vapor ignitions. A factory-installed temperature and pressure relief valve and tamper-proof drain valve further ensure safe operation. This model is built to last and features Tank Guard which is designed to proivde ultimate tank protection and increase lifespan of the water heater.. To reduce energy consumption compared to less efficient water heaters this model operates at an 0.70 Uniform Energy Factor UEF. Call 1-877-GO to get this water heater installed same day.