It looks like I have 10mm cable already. So an up grade to 10.5Kw would be ok and up grade the RCB to 46A. If I have good or a higer flow rate when I turn the shower temp to cold im assuming that the mains flow rate isnt an issue, so a higher Kw shower will give me the extra boost i want. thanks for all the advice. im comming to a conclusion here so comments would be gratefully recived
You're not replacing on a like-for-like basis, so you need to use a qualified electrician. I can't comment on the cabling that you have, because I can't see it from here.
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