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Thread: Underfloor heating with Evohome

  1. #1
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    Default Underfloor heating with Evohome

    Hi all,

    We've had evohome for quite a while now and are very happy with it. It's connected to an S-plan vented system with separate zone valves for DHW and CH. We're about to redo our kitchen and this will entail moving from having a radiator with HR92 to (single zone) wet underfloor heating. As the people doing the work are not familiar with Evohome (and I'm not familiar with wet underfloor heating) I'm quite keen to get a clear view as to how it works.

    My current understanding is that we will connect the HCC80R to the manifold that will be installed. The HCC80R will also power (and control) the pump which will circulate the water around the underfloor loop. We would then need a sensor in the room such as the DTS92 to measure room temperature and report to Evohome. Where I get less clear is around zone valves. The builder is expecting to add a new zone valve to the system for the supply to the heating loop. I can see various references to using a BDR91 to provide a heat demand signal to the boiler so what I wanted to check was that the bits that need to be bought are 1xHCC80R, 1xDTS92 and 1x BDR91 and that all of these will be bound into a single zone when set up on the evohome as the new kitchen zone.

    The other question is whether the T87RF2025 Single Zone Thermostat can be used as a better-looking alternative to the DTS92

    Any comments on whether I'm right or wrong in the above would be welcome! (or also pointers to documents I might have missed explaining this)

    Thanks

    Andrew
    Last edited by watchforstock; 26th June 2015 at 09:02 PM.

  2. #2
    Automated Home Legend paulockenden's Avatar
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    Can't answer your main question, although have you tried the system builder?

    As to the room stat, the T87RF looks nicer, but the DT92E has a few advantages - as well as temp sensing and control (which they both do) the square one has an Eco button (which is completely independent of the Eco setting on the evohome controller) and also a button that allows you to turn the zone off completely. The square one can also be either wall or table mounted, whereas the round one is wall only.

    But the round one does look a lot nicer. I'd probably go for that, unless you need to 'tinker' with the zone.

    P.

  3. #3
    Automated Home Legend top brake's Avatar
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    Quote Originally Posted by watchforstock View Post
    Hi all,

    We've had evohome for quite a while now and are very happy with it. It's connected to an S-plan vented system with separate zone valves for DHW and CH. We're about to redo our kitchen and this will entail moving from having a radiator with HR92 to (single zone) wet underfloor heating. As the people doing the work are not familiar with Evohome (and I'm not familiar with wet underfloor heating) I'm quite keen to get a clear view as to how it works.

    My current understanding is that we will connect the HCC80R to the manifold that will be installed. The HCC80R will also power (and control) the pump which will circulate the water around the underfloor loop. We would then need a sensor in the room such as the DTS92 to measure room temperature and report to Evohome. Where I get less clear is around zone valves. The builder is expecting to add a new zone valve to the system for the supply to the heating loop. I can see various references to using a BDR91 to provide a heat demand signal to the boiler so what I wanted to check was that the bits that need to be bought are 1xHCC80R, 1xDTS92 and 1x BDR91 and that all of these will be bound into a single zone when set up on the evohome as the new kitchen zone.

    The other question is whether the T87RF2025 Single Zone Thermostat can be used as a better-looking alternative to the DTS92

    Any comments on whether I'm right or wrong in the above would be welcome! (or also pointers to documents I might have missed explaining this)

    Thanks

    Andrew
    most underfloor heating manifolds don't need a zone valve but if it does simply wire it in with the UFH pump

    all covered in the youlearn training, and yes you can use Y87 round wireless thermostat, binding is covered in the evohome Wi-Fi installation guide

    a note of caution; UFH is not for the novice so recommend getting the system designed and installed by specialist.

    binding HCC80R to evohome is pretty straightforward and what is not covered in the evohome instructions is covered in the HCC80R instructions

    any queries please ask
    I work for Resideo, posts are personal and my own views.

  4. #4
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    Quote Originally Posted by watchforstock View Post
    Hi all,

    We've had evohome for quite a while now and are very happy with it. It's connected to an S-plan vented system with separate zone valves for DHW and CH. We're about to redo our kitchen and this will entail moving from having a radiator with HR92 to (single zone) wet underfloor heating. As the people doing the work are not familiar with Evohome (and I'm not familiar with wet underfloor heating) I'm quite keen to get a clear view as to how it works.

    My current understanding is that we will connect the HCC80R to the manifold that will be installed. The HCC80R will also power (and control) the pump which will circulate the water around the underfloor loop. We would then need a sensor in the room such as the DTS92 to measure room temperature and report to Evohome. Where I get less clear is around zone valves. The builder is expecting to add a new zone valve to the system for the supply to the heating loop. I can see various references to using a BDR91 to provide a heat demand signal to the boiler so what I wanted to check was that the bits that need to be bought are 1xHCC80R, 1xDTS92 and 1x BDR91 and that all of these will be bound into a single zone when set up on the evohome as the new kitchen zone.

    The other question is whether the T87RF2025 Single Zone Thermostat can be used as a better-looking alternative to the DTS92

    Any comments on whether I'm right or wrong in the above would be welcome! (or also pointers to documents I might have missed explaining this)

    Thanks

    Andrew
    Hi Andrew,

    In the case of a single zone UFH system (i.e. just one room) there is every chance this has been over specified. Firstly most UFH suppliers will use a manifold with combined pump/blending valve/zone valve, so in this instance there is no need for thermal actuators and the manifold ports can remain open circuit. This means there is every chance you will not need the HCC80R and can just use a Y87RF2024 or DT92E (thermostat and relay box combi) to simply switch the zone valve and UFH pump on heating demand and then the new UFH zone valve will provide switching for the boiler and heating pump. There are ways you could do all this wireless, but many mean a system configuration change and depends on the current configuration you have.

    The T87RF thermostat is a much more modern looking but DTS92 does have more features as Paul has said.

    If you would like to talk about this in further detail, you can of course give me a call.

    Many thanks,

    Richard.

  5. #5
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    I realise I am bringing up an old thread. But I have underfloor heating on a single zone and so didn't bother with getting a HCC80R but instead just went for the normal Y87RF kit, where the T87RF room stat is bound as the sensor and the BDR91 is bound as the actuator. The BDR91 switches the motorised valve and the underfloor pump on. My question is, what should the BDR91 for this underfloor zone be bound as a Zone Valve, Underfloor heating, Radiator Valve or Mixing Valve?

    Currently it's bound as a Zone valve. Can I bind it as a Underfloor Heating? p.s. When would you use Mixing Valve?

  6. #6
    Automated Home Legend top brake's Avatar
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    Zone valve.

  7. #7
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    What is a Mixing Valve and when is that used within an Evohome setup? Will a BDR91 pair as an Underfloor Heating Valve?

  8. #8
    Automated Home Legend top brake's Avatar
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    Electronic blending valve for mixed lower temperature circuit controlled by a HM80. Common in eu. Don't worry about it.

    No you cannot pair a BDR as UFH.

    The application type is defined by the actuator that you are binding. BDR91 = zone valve. Radiator = HR92. Underfloor = HCC80.

    All explained in the manual and on the evohome help menu.

  9. #9
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    Quote Originally Posted by top brake View Post
    The application type is defined by the actuator that you are binding. BDR91 = zone valve. Radiator = HR92. Underfloor = HCC80.

    All explained in the manual and on the evohome help menu.
    Sorry for ressurecting an old thread, but I'm faced with the same issue here. Why would I want to pay 275 for the HCC80R if I could just bind a BDR91 to a pump and use as a zone valve? What's the benefit of the HCC80 for UFH with only a single zone (i.e. a single room)?

  10. #10
    Automated Home Legend top brake's Avatar
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    Quote Originally Posted by EnigmaX View Post
    Sorry for ressurecting an old thread, but I'm faced with the same issue here. Why would I want to pay 275 for the HCC80R if I could just bind a BDR91 to a pump and use as a zone valve? What's the benefit of the HCC80 for UFH with only a single zone (i.e. a single room)?
    No benefit if just a Single Zone without thermal actuators
    I work for Resideo, posts are personal and my own views.

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