He’s using a submersible 1000W immersion heater in a 2.5 gallon water container which has been ... hit the optimum temperature. The current shower head installed drains the tank in about 2.5 ...

The shower head is marked 5400 watts — basic math ... how much power it should take to heat up water in an instant water heater arrangement like this. It was interesting to watch him measure ...

The Department of Energy estimated the costs saved over the long run by the new rules would be about $112 over 20 years.