I don't think you should do that. I've only ever seen immersion heaters in fixed wiring into a 20 Amp double pole isolator switch with a neon indicator light on it.
I think you need to bring a professional sparky in for that job. Look for one that has NICEIC/ELECSA registration (they carry a proper card).
Answered by: Minstrel
Date published: 2021-10-09