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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
    Sparkingchip:

    Don’t fit plugs and use sockets, they will melt.


    Agreed, for a 3kW immersion heater do not use 13 Amp plugs and sockets. A 20 Amp double pole switch is better.


    Service the beast every year for safety.


    Also it is wise to design the system so that items that will need to be removed or replaced, like the immersion heaters can actually be removed easily in the future. Also, expansion vessels often fail and need replacing. Any switches, valves or isolators should be accessible for repair or replacement. So boxing stuff in, or placing it too near to a wall or ceiling e.g. is a bad idea.


    Z.

    UNVENTED CYLINDERS FOR HOT WATER - Plumbing Tips - YouTube


    Z.


Reply
  • 0
    Sparkingchip:

    Don’t fit plugs and use sockets, they will melt.


    Agreed, for a 3kW immersion heater do not use 13 Amp plugs and sockets. A 20 Amp double pole switch is better.


    Service the beast every year for safety.


    Also it is wise to design the system so that items that will need to be removed or replaced, like the immersion heaters can actually be removed easily in the future. Also, expansion vessels often fail and need replacing. Any switches, valves or isolators should be accessible for repair or replacement. So boxing stuff in, or placing it too near to a wall or ceiling e.g. is a bad idea.


    Z.

    UNVENTED CYLINDERS FOR HOT WATER - Plumbing Tips - YouTube


    Z.


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