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I have a guy that has a 20 gallon electric water heater. The WH has a 3KW element in it,, The guy says that the water takes about 2 hours or more to heat up... I did some calculations and it shouldn't take that long..
Here's my calculations:
*If a BTU is the amount of energy needed to raise 1 lb of water 1 degF
*1LB of water = about 1 pint... (actually 1.04 LBS)
*20 gallons = 160 pints = +- 160 LBS actually closer to 166.4 LBS
*160 BTU's = the amount of energy needed to raise 160 pints of water 1
If the water temp is 50 degF and we want to raise it to120 degF that's
70 degF a difference.
*So --- 70(deg) X 160(pints) = 11,200 BTU's
You have a 3KW element. About 10,000 BTU's
*So... 11,200 / 10,000 = 1.12 hrs ( 1hour 8 minutes)
1.12 hours to heat the water to 120 degF
There are a few assumptions but it should have taken a bit over an
What does everyone think?