1kWh of heat energy can heat about 30 Litres 7.5 US gallons of water up from cold to showering temperature. A household of 5 people will use between 10-15kWh of energy each day to heat water (not including space heating). In the winter more energy...
The most common hot water system involves heating and then storing hot water in a tank. When hot water is used, it is drawn from the top of the tank, where the water is the hottest, and fresh cold water is delivered into the bottom of the tank....
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