Basics of how to connect my hot water heating circuits

Discussion in 'Plumbing and Central Heating' started by Lor0183, 23 Nov 2021.

  1. Lor0183

    Lor0183

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    Hello, I think this may be quite a basic question, so I apologise in advance!

    We are planning UFH in part of our space - this will be three circuits.
    In the rest of the space (bedrooms), we plan to have radiant wall heating via two circuits. This is done via water pipes built into panels on the walls. So similar concept to UFH, but through the walls rather than the floor.

    I believe we can have one five port manifold that the three UFH circuits and two radiant wall circuits all connect to?

    But I am not sure how they are then controlled. I believe we could have one thermostat located in a central place that then controls the heating for all five circuits, OR we could have two thermostats, one that controls the three UFH circuits, and one for the two radiant wall circuits. Is that correct?

    Can anyone then explain exactly *how* the thermostats are connected. Are they connected to the manifold, or the boiler? I don't quite understand how they all work together. Also, I assume the thermostats are wired to the manifold or boiler so they can 'talk' to it? (note: we try and limit/turn off Wi-Fi/Bluetooth at night, so we wouldn't want a wireless connection).
    So we'd need to quite early plan for where the thermostats will be placed and prepare for those wires well ahead of drylining? Is there anything else we need to know about this connection?

    Thanks!
     
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  3. flameport

    flameport

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    They are connected to a UFH controller, which is normally located next to the manifold.
    As a minimum, it will have connections for the zone actuators, thermostats, UFH circulator, and will have a single output to activate the boiler when required.
     
  4. Lor0183

    Lor0183

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    @flameport Thanks - so the UFH controller could then be connected to two separate thermostats? How do you set what thermostats apply to what circuits. e.g. One thermostat for 3 circuits, and then another thermostat for the other 2 circuits. Sorry for the basic questions.
     
  5. stem

    stem

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    As you can't fit TRV's to UFH, each UFH zone / room will have its own thermostat, otherwise some areas could get too hot, others not hot enough.

    There's an example of an 8 zone unit controller here

    If there are other areas that have radiators in they can be fitted with TRV's and be a separate zone on their own.
     
    Last edited: 23 Nov 2021
  6. flameport

    flameport

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    All done at the controller. Any combination is possible, so 5 zones with 5 thermostats, 1 thermostat for 5 zones, and anything in between.
     
  7. Lor0183

    Lor0183

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    Thanks @flameport. And I assume if we have one thermostat for multiple zones, then we would need remote sensors in each of the different zones, to monitor temperature?

    Are UFH temperature sensors usually better in the floor, or in the room?
     
  8. flameport

    flameport

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    Sensors are for the air temperature, either a wall mounted thermostat, or a wall mounted sensor with the thermostat elsewhere.
    Floor temperature is preset by the blending valve on the manifold.
     
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