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Heating and cooling: Radiator Pipe and UFH Manifold Question

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    I have run the majority of my radiator piping using Hep20 15mm barrier pipe, there are a few tricky spots to feed rads that will either require copper or reducing down to 10mm piping.

    Hep20 bends are bulky and unsightly.

    Will there be much issue with dropping to 10mm pipe about 50cm away from the rad or am I better off switching to 15mm copper?

    Also, if I were to run two rads off my UFH manifold using zone stats rather than TRV's is there a maximum distance for the pipework? My initial thinking is 6m flow and 6m return would be a non issue in the grand scheme of things considering 100m max runs for UFH?

    Or am I better running off the 22mm CH pipework with 3m drops and use TRV's?
  2.  
    domestic rule of thumb is no more than 2 rads off 15mm , distance is an average home I don't believe is much of a problem.
    if you run 10mm to a particular rad then this will just be slightly deprioritised , this could be balance out . I'd probably do that bit in 15mm copper just for a bit of soldiering fun.

    the UFH pipe is usually 100m + so rad on short run would be much less resistance , I presume you'd need to balance these right down otherwise the flow might find the ufh pipe an unattractive route and just flow round your rads.
  3.  
    Yeah the manifold has balancing valves so I guess I'd just set the flow the same as the ufh?
  4.  
    Is there an optimal flow rate on the radiator circuit? As the radiators would either be open or closed if on a thermostat as opposed to a trv. Does it really matter?

    The UFH manifold would be easiest option for pipework as opposed to dropping pipes down from first floor if off the radiator circuit
    • CommentAuthorringi
    • CommentTimeOct 28th 2015
     
    Try to get the flow rates as high as possible for all radiators while dividing the heat up between them in the way you wish. Then turn down the pump so you get the correct dT at the boiler.

    (So for example a room that needs 2KW of heat, should have double the flow rate then a room that needs 1KW of heat. The radiators should also have been sized in the same way.)

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