1. Visiting from the US? Why not try DIYnot.US instead? Click here to continue to DIYnot.US.
    Dismiss Notice

Combi and unvented cylinder

Discussion in 'Plumbing and Central Heating' started by Jitno123, 23 Sep 2017.

  1. Jitno123

    Jitno123

    Joined:
    29 Jan 2017
    Messages:
    41
    Thanks Received:
    1
    Country:
    United Kingdom
    Hi everyone

    Currently undergoing a loft conversion and my plumber has recommended to get an unvented cylinder installed, I like the idea of it but forgot to ask the plumber will this work with a combi boiler? Is it a simple job or will the boiler need changing? I've got a Baxi Duo Tec 33kw. As the loft conversion is adding another bathroom will defo need a pressurised tank as I will have 1bathroom and 2 shower rooms by the end of it.

    Thanks
     
  2. JohnD

    JohnD

    Joined:
    15 Nov 2005
    Messages:
    66,144
    Thanks Received:
    3,586
    Location:
    Coastal
    Country:
    Cook Islands
    you can use a cylinder with a combi boiler. the boiler doesn't know or care what the load is.

    The incoming water flow and pressure have presumably already been measured.

    you might need some larger-diameter pipes.
     
    • Like Like x 1
  3. Sponsored Links
  4. Jitno123

    Jitno123

    Joined:
    29 Jan 2017
    Messages:
    41
    Thanks Received:
    1
    Country:
    United Kingdom
    Thanks for the reply

    The pressure and flow have been tested and seem to be adequate.

    Could someone explain how the unvented is installed with the combi? My understanding is that combi is on demand water, so is there a way of converting it so it heats up the water in the cylinder?

    Thanks
     
  5. dilalio

    dilalio

    Joined:
    20 Mar 2009
    Messages:
    6,728
    Thanks Received:
    1,003
    Location:
    Potters Bar
    Country:
    United Kingdom
    The unvented cylinder is on the heating flow and return from the combi boiler and is controlled by motorised valve(s), cylinder stat and programmer that diverts heated system water through the cylinder coil when called for. The benefit of using a combi to do this is that you can also use the instant hot water side of the combi to serve certain outlets i.e. Utility sink/ kitchen sink/ cloakroom basin.
     
  6. Sponsored Links
  7. You'll also need to split the hot water pipes, so that the new shower gets it's feed from the unvented cylinder.
     
  8. DIYnot Local

    DIYnot Local

    Joined:
    3 Sep 2019
    Country:
    United Kingdom

    If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.

    Select the supplier or trade you require, enter your location to begin your search.


    Are you a trade or supplier? You can create your listing free at DIYnot Local

     
Loading...

Share This Page