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Just about to have PV panels fitted ( 4 KWp) and I want to use the excess power to heat the water in the HWC rather than export it back to the provider and I wonder why a lot of recommendations suggest fitting a smaller rated immersion one (1kw, 700watts etc) plus as this is for Summertime...

I am just about to have PV panels fitted, and instead of feeding back excess electricity to the providers I want to use this to heat the DHW. At the moment I have a 8yr old combi, which I intend to replace with one of the Worcester range (Greenstar Regular or System Boiler ? )) the old airing...