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? Thinking ahead a wee bit here, it looks like lots of people will be switching from gas combi boilers to electric combi boilers over the coming years. Most of the electric boilers seem to be around 12kW, while most of the gas boilers I've seen even in flats and small houses seem to be 30kW plus. So my main question is, how is replacing a 30kW + boiler with a 12kW boiler going to be sufficient to heat the place?

Secondly, what to do about about max demand? Many old domestic properties have 60A or even lower cut-outs, so how does that work with a ~50A boiler? Do we have to get the DNO to upgrade (in my past experience they are very reluctant to do so). And what about other large loads like showers? Do we have to fit some kind of selector switch so only one can be used at a time?
 
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