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About 60 gallons , if it is new. This amount will diminish over time because of sediment build up and corrosion. And while using hot water continuously the temperature of the water will decrease as you reach the water heater capacity because it is mixing cold water with the already heated water to replenish what is lost. Thus, the modern age of tankless water heaters. If sized, installed properly you can run hot water at an exact temperature for as long as you want. Fill a tub, still have hot water, in fact, fill a pool, and still have hot water.

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12y ago
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Q: How many gallons of hot water should you get from a 80 gallon hot water heater?
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