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Electric ‘Flow Boilers’…

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These are (or ought to be) simple devices that heat water electrically as it is pumped around a radiator circuit. In reality they are usually stuffed with electronics and its difficult to fully understand what it all does.

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They do the same job as a gas boiler, i.e. heat the water in real time as it is pumped through by a circulating pump, but using daytime electricity instead.  However, daytime electricity is typically three times the price of gas (per unit of energy), so they are shockingly expensive to run. 

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The main application for electric flow boilers is in modern highly insulated new-build flats where the heat load is very small, and there is no gas supply.  With a small heat load the cost of heating with electricity becomes less significant. 

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The market leader in flow boilers is the Amptec electric flow boiler by Heatrae Sadia, but there are several other makes and models available. The Amptec is strikingly small, being a box about 6 inches square and 3 ft tall. Other models are bigger.

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All electric boilers are 100% efficient in there technical sense, because all the electricity they burn is converted into heat. 

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First published 16th May 2018

Last updated 16th May 2018 

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