Quote:
Originally Posted by lawngilander
I currently have to run the water at the bathroom faucet for 30 sec. or more to get hot water. That’s a lot of wasted water. I could install a POU heater, but I’m not sure that would help. Was just curious if anyone else had done this.
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I am a little rusty, but here is the math. The wasted water is the cold water that is sitting in the underground pipe that needs to travel through the shower head before the hot water arrives. Assume the pipe size is 3/4 inches in diameter and the water heater is 50 feet from the shower.
Area of the pipe cross-section is "Pi x radius squared" or 3.14 x 0.375 inches x 0.375 inches = 0.4416 square inches.
Volume is 50 feet x 12 inches x 0.4416 = 265 cubic inches.
In gallons, that is 0.00433 cubic inches per gallon x 265 = 1.15 gallons of wasted water
I invite anyone to check my math.