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new economy 7 cylinder with two 11" immersion at the side,the original setup was a dual element immersion,the wiring at the consumer unit has a wylex white box 3 fuses, heating 15amp, power 30amp ,lights 6amp. and a wylex brown cu? with 7 fuses all 15amp i would like to wire the off peak...

hi all, should there be a 21amp double pole switch or a 13amp to a immersion heater thanks

hi all, i have a hot water cylinder with twin immersion (side entry) both 11" bottom for off peak, top for boost,and i would like to add horstmann timer,as the top immersion is not in use how difficult is it to add a timer to the circuit,also what size flex should be used from 20amp double...