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    Fittin TRV's and bypass valve

    I am going to fit TRVs to 6 rads on an existing system with 8 radiators and an ancient boiler, 2 rads w/o TRVs are smallest ones. I wonder if you would answer a couple of questions for me. The rads and existing valves are v. old (could be up to 35 yrs) I am concerned I might not remove the...
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