Immersion Heater Circuit Q.

2 Apr 2007
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United Kingdom
I have just finished rewiring the (non-kitchen) ring main in the house we purchased which was a bit of a state. One of the casualties is the immersion heater and the central heating control panel which were both on the ring main but which I have taken off in anticipation of putting them on their own circuit. I realise that the immersion heater should be on a separate circuit, but how big a transgression would it be to include the control panel?

My ideal plan would be a dual mouting box with a 20A double pole isolation switch for the immersion and [something else] for the control panel. The circuit will be run in 2.5mm T&E with a 16A MCB.

Both the immersion heater and the control planel are in our bedroom cupboard.

Any advice, including slapdowns, appreciated.
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Nothing at all wrong with running normal domestic central heating controls, pump and boiler via a FCU spur on a ring final -common practice. Load should be pretty low - 3A fuse should be enough.
there is a slight advantage in putting the boiler on its own circuit too..

this is if you have all your sockets on an RCD, boilers and their pumps often have slight leaks that can cause an RCD to trip, which is a nuisance.
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I can't see any reason not share a circuit between an immersion heater and central heating controls provided the circuit is adequately rated to take the full load of both.

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