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Twin immersion heaters

Former Community Member
Former Community Member
I am in the process of going unvented.  I have to use immersion heaters, and the new cylinder has two.  I have one feed to the existing immersion.  It is on 2.5mm2 T&E and connects to a 32A MCB on the CU.  I'm adding a DP isolating switch in the cylinder cupboard.  Will that be complaint for one of the immersion heaters?

To fully install the cylinder (ie the second immersion), I plan ask an electrician to either
(1) run an additional 2.5mm2 T&E cable back to the CU, connect it to the existing 32A immersion heater MCB at the CU. So the MCB protects two separate cables and the 2.5 T&E is within its capacities. 

Or
(2) run a new 6mm2 T&E cable back to the CU, connect to the existing MCB and in the cylinder cupboard, split the feed to two DP isolators, one for each immersion and its timer.


I'd be grateful for advice - are both approaches compliant?  Is one better than the other?  The amount of work will be similar.
Parents
  • 0
    If both are switched on at the same time the top one will turn off on its thermostat anyway once the top half of the cylinder is heated.


    I assume you have baths on a regular basis and will heat the whole cylinder accordingly, but if not the whole cylinder needs heating at least once a week as only using the top heater could result in nasty bugs living in the lower part of the tank.
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  • 0
    If both are switched on at the same time the top one will turn off on its thermostat anyway once the top half of the cylinder is heated.


    I assume you have baths on a regular basis and will heat the whole cylinder accordingly, but if not the whole cylinder needs heating at least once a week as only using the top heater could result in nasty bugs living in the lower part of the tank.
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