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Green Building Bible, Fourth Edition
Green Building Bible, fourth edition (both books)
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Heating and cooling: ASHP Zoning

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    We've now screeded the hallway floor with UFH in our 4 bed mid terrace. This now changes the dynamics of the house.

    How would you zone it? Ideally according to John Cantor the whole house should be on at the same time running at the lowest water temperature required to maintain the desired temperatures. The rooms are as follows:

    Openplan Kitchen/Diner - UFH
    Hallway - UFH
    Lounge - Radiator
    Dining Room - Radiator
    Bathroom - UFH
    Bedrooms - Radiator
    Attic conversion - Radiator

    The Ecodan has 2 zone options, it's currently set as rads on one zone, UFH on the other but the dynamics have now changed.

    How does just having 1 stat set in the hallway (a traditional approach) sound and all run together? KISS
    • CommentAuthorbarney
    • CommentTimeApr 28th 2020
     
    If you do that, the whole house will tend to the hall temperature - which may or may not be appropriate

    Personally, on a single zone system, I would look to find the lowest flow temperature practicable, and then run it on weather optimization (assuming that he parameters of minimum system flow and minimum system volume are met)

    Regards

    Barney
    • CommentAuthorMike1
    • CommentTimeApr 28th 2020
     
    Ground floor on one, upper floor on the other. At some times in Autumn / Spring you would probably find that you didn't need the upper floor heating.

    And a separate heater (or zone) in the bathroom so I didn't need to heat the entire 1st floor if I just needed a little extra heat while showering.
    • CommentAuthorJonti
    • CommentTimeApr 28th 2020
     
    I would have thought you will find the UFH and radiators will heat the space quite differently and would need separate settings.
  5.  
    The radiators have been oversized so once up to temperature there hasn't been any issues, the issue is the delay in heating up but it's left on 24/7 during the heating period
    • CommentAuthorJonti
    • CommentTimeApr 29th 2020
     
    Makes sense. UFH is most efficient if left on permanently.

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