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Electric Boiler Vs Immersion Heater . Immersion heaters generally use around three kilowatts of electricity per hour, which typically amounts to running costs of around 50p an hour. We help you understand in which situations each of them is most recommended. Water Heater Efficiency Hybrid Options from www.healthyheating.com In many ways, an immersion heater works like a large kettle. Whereas, combi boilers use a heating system. We will look at a few of the basic decisions.