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That depends on both how quickly water flows out of the shower head (gallons per minute) and how hot the water is (ratio of cold water to hot water).

Also depends on the recovery rate of the water heater. As you use up the hot water, the water heater is making new hot water, but not usually as fast as you are using it. A high recovery rate will extend the time you have hot water.

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14y ago
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9y ago

The pressure depends upon the city/well pressure setting, but water will run through the pipes to your faucet as soon as the 40 gal. tank and pipes are full. Remember to remove the aerators when you do any major changes as the faucet aerators will clog up with any loosened debris.

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Q: How many minutes will 40 gallons of hot water last in a shower?
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Your hot water heater is not large enough.


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