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That depends on how much water is drawn from the tank and how often it is drawn.

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15y ago
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6mo ago

The hot water from a 40-gallon tank can last for about 30-40 minutes of continuous use. However, this can vary depending on the temperature setting of the tank, the flow rate of the fixtures, and the efficiency of the water heater.

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Q: How long should hot water from a 40 gallon tank last?
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