g: Dont boilers usually have their own fat radial circuit?

JR: Own radial, often yes; fat (as in high current) not typically (unless
you were talking about an immersion heater circuit - but even those are
often on 15A or thereabouts - less than the design load of a double
socket).


Oh yes, sorry, I forgot about gas, we don't get it here,
I'd assumed the OP was heating lots of water with electricity as I hope
to do
(after I've got the cold water system mended and improved)
[g]