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Advice on adding a CH zone please

Discussion in 'Plumbing and Central Heating' started by Gravyspoon, 22 Feb 2019.

  1. Gravyspoon


    23 Oct 2016
    Thanks Received:
    United Kingdom
    Hi all,

    I'm after some advice please on adding a zone to our existing central heating system. I'm quite confident with plumbing itself, and the wiring involved, but i have a few questions that i hoped someone might be able to answer for me.

    The boiler is a 2006/7 Ideal c24 mini HE combi.

    I would like the existing main heating circuit to be independant of the room that the new rad is going into.

    Ideally, I would fit 2 x 2 port valves, however my concern is that as the valves would be mounted on the pipe work about 12inches below the boiler, and if a bypass valve is required, this would be too close to the boiler to be effective if the boiler is over running and both valves are shut. Am I correct? Does anyone know if a bypass valve is required with my boiler? We have a permanently open rad on the existing circuit, but this isn't a lot of use is the zones are closed.

    As a way around this, i thought about a mid 3 port valve which i understand are normally used to control a CH/HW system. My logic being that water will always be able to flow through at least one of the ports if neither zones are calling for heat. Can a 3 port valve be used in this way to control 2 CH zones instead of 1CH and 1HW zone?

    Thank you in advance.
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  3. dal5band


    3 Mar 2005
    Thanks Received:
    United Kingdom
    Could you use some sort of overrun signal from the boiler to hold open one of the zone valves during the overrun ? Would need careful planning as the valve switches on the boiler in the first place !
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