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I have a Baxi Combi boiler and want to add new TRVs to the radiators. Do I need to drain the system or can just turn off all the radiators and hope not much water escapes. How do I add new inhibitor if I have to drain the system. Any help will be gratly appreciated

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  • hirot Nov 10, 2008

    Sorry this didn't really answer my question about is it neccessary to drain the system. I have worked out about the auto feed and now how to add inhibitor.



    Thanks for trying though

  • hirot Nov 11, 2008

    Again many thanks for your help. I can turn off the mains feed but I guess the the real question now is do I really need to drain the system or if I work on one radiator at a time, turning one valve off, will much water come out when I swap the other valve.



    Regards Hirot

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You will need to isolate the boiler from the radiators because there is an auto feed valve that will continue to allow water into the system if the pressure in the boiler drops. There should be some valves off of the boiler that will allow you to do this.

Posted on Nov 07, 2008

  • Chandler Ede
    Chandler Ede Nov 11, 2008

    You will need to isolate the boiler! The inhibitor is only a quart or two of fluid, either pump it in using a pump and garden hose or use a funnel and hose and pour it down the pipe as you replace the radiator valves with TRV's.

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