Hi all. Amateur, fair concept of mains electricity, but also some idea of my limitations.... Anyway, I've stuck an immersion heater into my hot water cylinder (thanks to the folks on the plumbing forum) and got a timer in place and ready to go, but have realised I'm an idiot and should have planned it better, as there's no satisfactory means of wiring it up. There's a tempting mains outlet which controls the gas boiler and timer, which seems to be on one of the socket circuits from the consumer unit. I suspect I'll be needing the fire brigade if I wire the immersion heater into that circuit, but would be delighted to hear I'm worrying needlessly. There is also a beefy cable coming from the plasterwork and entering the power shower. Now this seems to be a good candidate, but the problem is, I'm quite fond of having showers. The consumer unit has some 32A breakers, plus one 40A breaker which is labelled 'immersion heater' - this controls the shower. I can only imagine that there used to be an immersion heater but no shower, though why the original immersion heater was removed (the hot water cylinder is the original) and replaced by a blank, I have no idea. Presumably someone couldn't think how to support both items on one circuit. This doesn't bode well! There are no spare breakers, or slots for breakers, in the consumer unit. So..... (answers to one or more would be great) 1) can I use the nice, handy outlet on the 32A 'sockets' circuit? (expected answer - laughter). 2) would it be OK to tee into the cable on the 40A 'immersion' shower circuit (and if so, how)? (expected answer - sniggers) 3) do I need an electrician, and how much work will he/she need to do - dig big holes in the plasterwork? replace the consumer unit? (expected answer - yes, yes and yes). Oh, and, out of interest, supplementary question 4) why can you plug a kettle into a mains socket safely, yet you need a dedicated circuit (or at least not a spur) to wire up an immersion heater of about the same power requirement? Thanks!