How much energy is consumed to heat water for showers?

Question

I know people that take five minute showers and then some that take hour-long ones. In terms of energy saved, would it be worthwhile to (a) cut down on shower time, and/or (b) bathe with cooler water? Why?

Answer 1

Well first off showering for an hour wastes way too much water.  Secondly energy saved when taking cooler showers or quicker is substanial.  Water has a very high tolerance for heat change.  If you know chemistry then 4.184J/g*C degree is how much energy is used.

So basically 4.184 joules of energy is used to raise water temperture one Celcius degree.

Answer 2

I'm not into cold showers, and I like my hot tub really hot.