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100 litres warmed from 10 to 45 degrees C requires 35x100000 calories. There are 4.2 Joules per calorie so that is 14.7 MJ of energy, in other words 4 units (kWh).

The tank would also need to be heated which might take an extra ½ unit, so a

3 kW immersion heater would need to run for 1½ hours.

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12y ago

What else can I help you with?