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Unvented Electric Water Heating Servicing Intervals.

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If an unvented electrically heated water system is installed in a rented holiday home how often should it be serviced to keep safe and legal please?


Z.
  • Former Community Member
    0 Former Community Member
    On an annual basis by a competent person familiar with unvented systems - typically any person in possession of a valid G3 certificate


    Servicing is not a legal requirement - installation by a competent and certified person is


    Given the explosive potential of the vessel used in a holiday let it would be unwise of the landlord not to get it serviced


    Regards


    OMS
  • 0
    Thanks OMS. I did advise my customer to contact the makers for servicing advice. The unvented systems do appear to be complicated bombs.

    https://www.youtube.com/watch?v=QFOYWOt_qVg


    Z.


  • 0
    How big is the system (amount of stored hot water)? From memory small systems (<15l) used to have laxer legal requirements than larger systems. I think a lot of the undersink type heaters are deliberately just below that limit. Might have changed by now though.

      - Andy.
  • 0

    AJJewsbury:

    How big is the system (amount of stored hot water)? From memory small systems (<15l) used to have laxer legal requirements than larger systems. I think a lot of the undersink type heaters are deliberately just below that limit. Might have changed by now though.

      - Andy.




    Hello Andy,

                               I am not sure of the size but it is situated in the airing cupboard and not under a sink. It supplies all of the holiday home's hot water as there is no gas.


    Z.

  • 0
    Here is what a big unvented cylinder looks like when it explodes. I had forgotten about this video. An advert for regular servicing if nothing else.


    https://www.youtube.com/watch?v=61uDmQF5I2E




    Z.
  • 0
    I can advise that the servicing of an unvented cylinder is as likely as the quarterly, now six monthly, pressing of the test button on an RCD!
  • 0
    Given that they tend to be installed in the sort of accommodation that has no gas because it is too onerous to meet the regulatory requirements, I;d be surprised if they get any kind of service at all until they stop working..
  • 0

    mapj1:

    Given that they tend to be installed in the sort of accommodation that has no gas because it is too onerous to meet the regulatory requirements, I;d be surprised if they get any kind of service at all until they stop working..




    That is worrying Mike. 


    Z.

  • 0
    Having watched the manufacturer's services engineer press the pressure relief valve button and then charge me £50 for each of the first two years, I now do it myself.


    It's not difficult, but it is important to do it.
  • 0

    Grumpy:

    I can advise that the servicing of an unvented cylinder is as likely as the quarterly, now six monthly, pressing of the test button on an RCD!




     

    Nice one. I wouldn't have an unvented system in my house, but then again, I don't have RCDs in my fuse box. ?

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