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Well I am still mystified as to the answer. As far as I can see there are three possible answers really. 1/ There is no clear cut advantage overall of the great difference of two immersion heaters in a cylinder or one immersion heater in the cylinder and a Willis Heater outside of the cylinder...

As in In I reckon John rather than I delta n, it does confuse some people who calls themselves Electricians but that is another story for another day methinks ;) PS - an Electrician once asked why we Electricians use so many Greek Symbols and another Electrician replied "Then we can charge...

In my experience (which I can not claim is particularly extensive although I have seen quite a few ) there are both double elements vertically or two single elements horizontally, I can not guess with any accuracy which type is likely to be the most common overall but I do suspect that it might...

I must admit that I had Assumed RCB to be a typo of MCB - yes I know I should Never Assume ! Sorry :oops:

yes agreed , what I can not get is the rest of the "apparent hype" about how it differs too. That is the bit that I find puzzling me

It is not that uncommon for a Radial circuit to be 16 or 20A on bog standard wiring and such a radial could be daisy chained or three sperate runs from breaker to socket. This can be done with any number of sockets and you would most probably evalute the floor area served and type of expected...

Mavity will cause hotter liquids to rise and cooler liquids to lower , yes I will buy into that concept no problem there as far as I can see. Therefore causing the water circuit to flow so a back boiler in an old fashioned coal fire or the immersion heater in the cylinder causes a flow so yes...

Actually, just to put the record straight. I see two options - those in favour of the Willis wing the arguement by proving it. Myself (and John) show it can not be proved. I actually prefer that first option to come about if I have any choice about it. I can envisage (slightly) one small...

I agree - I would love someone would come up with an explanation as to why it actually works and I could have a blinding "Road to Damascus" experience and shout Eurika etc , after all just because I do not (yet) get it, does not mean that it does not exist. I do not see a way that it is remotely...

I remember a thread about this a while back and the issue was a bit challenging , to see the issues and make a decision seemed on a parr with the voltage optimisation/snake oil debate - my conclusion with the voltage optomise thing was that in an extremely small set of circumstances it could mae...

Yes you are correct in that I agree but damp-ish plaster around a Live metal back box in the wall for one thing is a good idea to avoid as is access to a part of the box touchable by dry plaster being exposed as does happen in real life, both are shock risks. A line conductor touching a back box...

I am sure that I do agree with that! Having seen, for some reason a couple of times, the fixing screws for the socket have been replaced with nylon screws therefore no continuity from socket to backbox. Although it might have been some event in the distant past to mitigate the lack of earths on...

Yes the manufacturer is attempting to guide you away fro extension leads for valid reasons so all good on them for doing so. You would not believe the crazy things we see done with extension leads and it is not just overloading we are talking about. With good sense and care avoiding the points...

Seems like a good result. Never assume that colour coding is correct - unless you have carefully done it yourself and rechecked. Blue (Black) is not always N. Brown (Red) is not always L. an L might be a Perm L or it might be a switched L (sometimes L sometimes not L (including that sometimes...

Yes I discovered something unexpected initially - as a humble Electrician working with plumbing/heating bods one job where once again I was asked to wire in the controls , this particular one was for our local Clown Hall, a rather big building so had some features that were not as simple as you...

I will not complicate it further by adding you could also have a central light switching from one or both sides of the bed in addition to another 1 or three at or mear the doorway/hallway etc

YES - Whichever solution you choose it is almost always a comprise between initial costs, running costs and best comfort/practicalities you are prepared to live with - everything in life is probably like that too. At least you have studied your choices and made an informed decision, once it is...

Almost the same - we did have solid fuel central heating and a back boiler in the fire feeding the immersion heater , so the fire was coal like in the main room and the cylinder in the bathroom aove got hot so the bathroom warmed up a bit and there was a little heating in the radiators but with...

Speaking only about RCD protection and whether two RCDs giving "In Tandem" Protection the main advantages/disadvantages are:- 1/ If we accept some theory that RCD failure (on a sort of averaged figure) might be around 7% then (purely arithmetical) invokes the possibillity that failure of two...

LOL