Reply To: Hot Water

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Robert Stephen Morton

Johnws. The S.I unit for heat is the Joule (J) it takes 4,186 J of energy to raise the temp of 1 litre (= 1 kg) of water through 1degree C this is called the specific heat capacity of water.
Heat energy =mass specific heat capacity temp rise
H.e (kg) = mass (kg)x 4.186 (t2 -t1)deg c

Johnws, you need to know the initial temp to calculate.

the temp dif in a pressure situation is aprox 1deg f / 550ft

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