assuming your delt T is in F degrees
I get 19.8 kW
using 3.785 kg per gallon and a specific heat of 4.187 J/g K
it is interesting at $0.15 per kW hour it costs about 5 cents a minute to take a shower.
also a 45 deg F rise is a pretty cold shower, need more like 70 F rise, 50 to 120...no?
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