Yes they do but it's not the tidiest way of doing things. I suppose we are creatures of habit and if we want a light on we are used to flipping a switch; not turning it on and off and on again.
HI Try a 20a sink/bath dual tank immersion heater switch. Bit of overkill I know but fits a std single box.
(BTB Dave try reverse psychology ,wait while SWMBO is in shower then turn all taps on downstairs ) NB get ready to run..
HTH
CJ
On Thu, 15 Nov 2007 13:10:00 GMT someone who may be wrote this:-
Then it was not designed and installed properly.
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