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A 40-gallon gas water heater typically takes about 30 to 40 minutes to heat water from a cold start to the desired temperature. However, the exact time can vary based on factors like the initial water temperature, the heater's BTU rating, and the efficiency of the unit. Some models may heat water faster, while others may take longer.

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3d ago

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How long to heat up 50 gallon water heater after filling it?

Usually about an hour.


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The time it takes for a water heater to heat up can vary depending on the size and type of the heater, but typically it takes about 1 to 2 hours for a water heater to heat up a full tank of water.


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