immersion heater with boost

27 Sep 2004
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United Kingdom
Just a quickie for you - if theres one immersion heater circuit supplying 2 seperate immersion heaters (in one tank) both are 3kW each, surely this needs to be turned into 2 seperate circuits one for each, as if both immersions were on at the same time they will pop out the 16A MCB.

Also how would you connect up a immersion heater time clock (economy 7 type from Newlec) which has a boost function. Currently the off peak supply controls the lower immersion heater, but the boost function wants to switch on the higher element.

Ah, just a thought, is 1 circuit for both ok, if the time clock doesnt allow both elements (ie off peak elemnt and boost element) to be on at the same time?? Thanks all...
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Re that timer, it is designed to be connected to a PEAK circuit, live 24/7. You then set the time and leave it. It is designed for the bottom element, or the only element.

There are other variations which have two supplies / one output, two supplies, two outputs etc etc etc.

What is the exact model you are wanting to use?
Its OK now, as I have installed a new immersion heater circuit for the boost element, and got rid of the economy 7 time clock and put in a bog standard 24hr clock as the customer didnt want it on for the minimum time of 3.5hrs on the economy 7 clock.

Thanks for your reply anyway Lectrician!!

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