Gas Water Heater Features. The features listed below vary in availability across the Signature® 100, 300, 500, and 900 Series. Advanced tank protection extends life of your water heater. Built-in safety system reduces the risk of accidental flame ignitions. May be eligible for additional local rebates - check the Rebates Center.. Premium Performance and hot water efficiency delivers up to 33% more hot water and consumes up to 31% less energy. Efficiency Condensing Gas Technology - Unique heat exchanger design delivers maximum efficiency, performance and reliability for the everyday home. Venting Flexibility - equipped for power vent or power direct vent installations.

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Generate efficient and reliable hot water for households with 3 to 4 people, when sized appropriately, with A. O. Smith's Signature 100 Series Tall Ultra Low NOx Atmospheric Vent Natural Gas 40-Gallon Water Heater. With an environmentally friendly 40,000 BTU Ultra Low NOx gas burner, this model delivers 72 gallons of hot water in the first hour.. Ensure your family has ample hot water for their daily needs with this A. O. Smith Signature 100 Series water heater. Designed to provide efficient, reliable hot water for households with 3 to 4 people when sized appropriately, this 40-gallon natural gas water heater deliver 80 gallons of hot water the first hours thanks to the environmentally friendly 40,000 BTU gas burner.