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Hi. We have an immersion heater tank on economy 7. We have had no issues with this since moving in 3 years ago. We have just had our bathroom renovated including an electric towel heater wired in. From the very next day our night time immersion switch keeps tripping. Our decorator tells us there is no connection but it seems a large coincidence. He has tried to get the immersion out to replace it but was unable to so says the tank needs replacing. Can you please let me know your thoughts and if there a likely connection. Thanks
 
OP, what size is the element in the towel rail in kW, what size is the immersion heater in kW and finally what size is the MCB in amps(the switch that keeps flipping down).

If they have spurred off the immersion circuit then it could be overloaded.
 
JUST ABOUT TO GET AN EXPERT ANSWER:

[ElectriciansForums.net] Immersion tripping after new bathroom
 
The chap who did the bathroom, who has been with an electrical tester since and looked at the immersion. 1 other question too, if the day switch is not tripping, if we turned that on for 2 hours per day, how would the costs compare roughly to having the night switch on all night?
I'm confused, is the OP saying that the immersion and towel rail both work when the night switch is off but MCB trips when night switch is on? So does she then have 2 separate circuits for the immersion, one for day and one for night but the day setting is working OK, and there's only one MCB for the immersion?
 

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