# Math

If a gas water heater was able to produce 25000 btu/hr, how long would it take to heat 30 gal of water from 70f to 140f

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1. You need the specific heat of water in BTU per gallon deg F
Well the specific heat of water is ONE BTU per POUND deg F
and a gallon is about 8.33 pounds of water
so
C = 8.33 BTU/(gal deg F)
SO WE NEED
btu = 8.33 * 30 * 70 = 17496 btu

17497 BTU = 25000 t
so
t = 0.7 hours
or
42 minutes

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posted by Damon

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