Shared immersion heater circuit

Philip Saunders · Thursday at 7:36 PM

Hi everyone

Is it permissable to connect 2 immersion heaters to one RCBO and supply cable?

I'm installing a water cylinder (which has 2 immersions) in a new utility room, which used to be a kitchen.

I want to repurpose the old cooker supply cable which is 10mm. If it's legal, I want to feed both immersions vis seperate DP switches, but they will share the same RCBO in the consumer unit.

In short, is there any way I can use this cable to power 2 immersions? Pulling another cable via the same route as the original isn't possible - I'd have to run it along the outside of the house. If I have to I will, but it's not ideal.

Thanks for any advice.

James · Thursday at 7:57 PM

you could put a small consumer unit on the end of the 10mm
a 4 way garage board would be ideal.

brianmoooore · Thursday at 8:02 PM

Most HW cylinders that are heated solely by electricity have two immersions, but only one is normally used at a time.

Philip Saunders · Thursday at 8:03 PM

James said:
you could put a small consumer unit on the end of the 10mm
a 4 way garage board would be ideal.

Thanks for that - I was thinking along those lines.

Much appreciated

Philip Saunders · Thursday at 8:08 PM

brianmoooore said:
Most HW cylinders that are heated solely by electricity have two immersions, but only one is normally used at a time.

Thats true - but do the regs allow then to be supplied by the same cable/breaker?

Also, although they're generally only used one at s time, they COULD both be active if the cylinder is cold, although the top one would stat itself off fairly quickly.