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Combi on a 1 pipe system

Discuss Combi on a 1 pipe system at UK Plumbers Forums; As above will it work? Doing a combi conversion and lifted some boards under radiator to alter some pipework and discovered the heating circuit is a one pipe system! I ...
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    Default Combi on a 1 pipe system

    As above will it work?

    Doing a combi conversion and lifted some boards under radiator to alter some pipework and discovered the heating circuit is a one pipe system!

    I have only ever removed this type of system never connected onto it.

    I know the it won't be as efficient and I am going to recommend a re pipe. However will it work properly should they choose to ignore my advice?

    many thanks

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    Default Re: Combi on a 1 pipe system

    I will work but some manufacturers won't warrenty the boiler, also as you have said not very efficient
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    Default Re: Combi on a 1 pipe system

    Cheers Shaun its a Worcester so will give them a ring and find out

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    Default Re: Combi on a 1 pipe system

    Quote Originally Posted by KingDoey View Post
    Cheers Shaun its a Worcester so will give them a ring and find out
    Worcester are fine with it the only other one I know is villant
    Whyme likes this.
    IMPORTANT:
    Carbon Monoxide can be produced when ANY fuel is burnt, including oil, gas, wood and coal.

    Want gas safety or boiler repair advice? :
    Please supply your Gas Safe / Oftec / Hetas Number, DIYers, odd job people and have a go heroes need not apply, and remember any fuel burning appliance can kill


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    Default Re: Combi on a 1 pipe system

    Goody gumdrops

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    Default Re: Combi on a 1 pipe system

    Thousands of one -pipe systems out there , if you hadnt lifted the boards you wouldnt have known
    http://jdlplumbingandheating.co.uk/

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    Default Re: Combi on a 1 pipe system

    Yet it will work, but my advice would be, go round and check all rads work before you start.
    I've been caught out before, by the customer that says " that used to work before you changed the boiler"! Only to take a board up to find it's been taken 20feet from the one pipe loop.
    As long as no one has adapted the system, all should be fine. Obviously, power flush before new install.
    Last edited by Chalked; 07-01-2017 at 10:09 PM.

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    Default Re: Combi on a 1 pipe system

    Cheers for the advice. Yeah system was powerflushed. Halfway through the job now so no going back. Customer is pretty sound though so shouldnt be any issues like that. Like i say we defo recommend it gets repiped

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    Default Re: Combi on a 1 pipe system

    Just make sure that the return temperature isn't too low. Some manufacturers say that the return to the boiler must be above 40 degrees to prevent the heat exchanger rotting out. If this is the case fit a bypass/three port mixing valve between the flow and return.
    You can't really powerflush a one pipe system very well as it wont go through the radiators without some persuasion. As said above it needs to be repiped.
    Reg Man likes this.

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    Default Re: Combi on a 1 pipe system

    Did the system work fine?

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    Default Re: Combi on a 1 pipe system

    Flew round. Worked like a dream

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