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which is most efficient for water heating - gas or electric?
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<blockquote data-quote="ProDave" data-source="post: 266398" data-attributes="member: 6969"><p>If you are planning a new install I would recommend a heat store tank with input coils for solar and a wood burner, as well as an input for a boiler.</p><p></p><p>But I don't think that is what you were asking is it?</p><p></p><p>Electrically heating the water will be the most EFFICIENT as 100% of the electrical power used heats the water.</p><p></p><p>A gas boiler will be less EFFICIENT as it has to heat it's own mass and the hot water used to convey the heat from the boiler to the tank.</p><p></p><p>But is your question really which will be the CHEAPEST? That's a completely different question. and the answer today, may not still be the same in 5 or 10 years time.</p><p></p><p>If you have solar PV, build a dump controller to turn on the immersion heater when there is spare unused solar generation. Done properly that will still let you use things like the washing machine, tumble dryer, dishwasher etc, and only turn on the immersion if there is actual spare power at any given moment.</p><p></p><p>See the Solar PV for my discussion on the Solar PV dump controller that I built.</p></blockquote><p></p>
[QUOTE="ProDave, post: 266398, member: 6969"] If you are planning a new install I would recommend a heat store tank with input coils for solar and a wood burner, as well as an input for a boiler. But I don't think that is what you were asking is it? Electrically heating the water will be the most EFFICIENT as 100% of the electrical power used heats the water. A gas boiler will be less EFFICIENT as it has to heat it's own mass and the hot water used to convey the heat from the boiler to the tank. But is your question really which will be the CHEAPEST? That's a completely different question. and the answer today, may not still be the same in 5 or 10 years time. If you have solar PV, build a dump controller to turn on the immersion heater when there is spare unused solar generation. Done properly that will still let you use things like the washing machine, tumble dryer, dishwasher etc, and only turn on the immersion if there is actual spare power at any given moment. See the Solar PV for my discussion on the Solar PV dump controller that I built. [/QUOTE]
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