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Comb boiler and rad full open

hipponax1973
hipponax1973
in General Questions & Topics
I seem to recall this ages ago-if using a combi boiler is one radiator meant to always be left fully open eg without a TRV and if so, is the outflow
meant to be fully open as well?

Best Answer

  • GrilledCheese2
    GrilledCheese2 ✭✭✭
    Answer ✓

    If your boiler has an internal bypass valve or your plumber fitted an external bypass valve, then all radiators can have a TRV. In the absence of a bypass valve then one radiator has to be always open. The valves on the radiator don't need to be fully open. A lot of the new combi boilers have an internal valve.

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