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How much energy does it take to heat up the water for your 20 minute shower?   ...

How much energy does it take to heat up the water for your 20 minute shower?   

The shower flow is 3 gallons per minute.   

Cold water enters your house at 50 F.  

Your hot water heater is set at 150 F and operates at an efficiency of 80%.

You mix hot and cold water to attain the desired temperature of 100 F.

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