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    System or Normal Boiler replacement

    I am considering replacing my existing Vaillant thermocompact (non-condensing) system boiler principally because it is now 16 yr old. It’s currently part of an indirect, unvented, Y plan set- up comprising a vented indirect hot water cylinder ( in the airing cupboard) and a cold water tank (...
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    Noisy 3 Way Port Valve?

    It’s‘ probably a coincidence but ever since I had an auto bypass fitted (which required some pipework alterations in my airing cupboard), I’ve been getting a vibration noise when my programmer instructs my Honeywell 3 way port valve to switch from Heating only to Heating and Hot water. My...
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    Noisy Auto by-pass valve

    I’m getting intermittent vibration and noise from a newly installed Danfloss auto by-pass valve. This was put in following installation of Dayton TRVs on all my rads. I can isolate the valve and the noise stops but would like to know if removing a TRV head from, say, a bathroom towel rail ( or...
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    Central Heating Room Thermostat Mystery

    Can somebody please advise why my Drayton digital room thermostat (Digistat) still switches on the boiler i.e. "calls for heat" despite my programmer's CH setting ( Drayton LP522) being set to "off". It seems to be either faulty wiring or a faulty programmer. In all other respects the system...
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