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Mixed System with UFH - Wiring to Manifold

Hi,

My plumber is in the process of installing Tado for my new heating system, which consists of:

  • Boiler (Vaillant ecoTEC plus 630)
  • Megaflo/Hot Water Cylinder
  • Radiators for the loft and first floor
  • 3x Wet Underfloor Heating zones for the hall, kitchen/diner and utility/bathroom

I was told by Tado support that my system is compatible and that I would need a starter kit with an extension kit to manage the radiators/hot water, and 3x add-on thermostats to manage the seperate UFH zones.

Am I right in thinking that the thermostats controlling the UFH need only to be hard wired to the manifold to control the actuators/zone valves for the three seperate zones, but then this is the only wiring required? Hence the hot water/boiler will be turned on when needed through the wireless connection between the three UFH thermostats and the extension kit?

I've looked through the manuals but I can't find any wiring diagrams in regards to underfloor heating - can someone point me in the right direction please?

Thanks in advance!

Answers

  • I have mostly the same configuration. My boiler is OpenTherm, 3 UFH zone, 5 radiators upstairs.

    Tado said it would be compatible.

    First of all after you buy everything and start installing you need to talk to Tado because the smart Thermostat that you buy with the extension kit is hard wired to NOT switch. No matter what you save in installer menu, it will not switch, only send data to the extension kit.


    Secondly, after setting this up, my boiler Bosch Condens 2000, as soon as a call for heat was requested by the thermostat, it entered into d5(short circuit) error mode. I am still waiting for over a week for a reply from Tado.

    The smart radiator valves on the other hand work well and can start/stop the boiler without problems.


    I also tested a Nest on OpenTherm using same wiring and SAME wires and it works without problem on my boiler.

  • I have mostly the same configuration. My boiler is OpenTherm, 3 UFH zone, 5 radiators upstairs.

    Tado said it would be compatible.

    First of all after you buy everything and start installing you need to talk to Tado because the smart Thermostat that you buy with the extension kit is hard wired to NOT switch. No matter what you save in installer menu, it will not switch, only send data to the extension kit.


    Secondly, after setting this up, my boiler Bosch Condens 2000, as soon as a call for heat was requested by the thermostat, it entered into d5(short circuit) error mode. I am still waiting for over a week for a reply from Tado.

    The smart radiator valves on the other hand work well and can start/stop the boiler without problems.


    I also tested a Nest on OpenTherm using same wiring(OT1 OT2 on nest) and SAME wires and it works without problem on my boiler, so Tado should really reconsider their business because this is by far the worst installation of any electronic device you can get in your home.

  • I have mostly the same configuration. My boiler is OpenTherm, 3 UFH zone, 5 radiators upstairs.

    Tado said it would be compatible.

    First of all after you buy everything and start installing you need to talk to Tado because the smart Thermostat that you buy with the extension kit is hard wired to NOT switch. No matter what you save in installer menu, it will not switch, only send data to the extension kit.


    Secondly, after setting this up, my boiler Bosch Condens 2000, as soon as a call for heat was requested by the thermostat, it entered into d5(short circuit) error mode. I am still waiting for over a week for a reply from Tado.

    The smart radiator valves on the other hand work well and can start/stop the boiler without problems.


    I also tested a Nest on OpenTherm using same wiring(OT1 OT2 on nest) and SAME wires and it works without problem on my boiler, so Tado should really reconsider their business because this is by far the worst installation of any electronic device you can get in your home.

  • FlorinO I'm slightly confused as you're posting the same information multiple times onto this but none it is actually answering my question?

    I think I've now resolved this through Tado support, who have advised me to purchase a Heatmiser UH4 and actuators to control the UFH manifold, and the wiring will then be between the UH4 controller and Tado thermostats.

    I'll post a final update once we've got this setup and running.

  • I have UFH in my kitchen and, as you suggested, I control the pump and zone valve from the relay output of the Smart Thermostat and that calls for the boiler wireless via the extension kit.

    If you have three zones with just one pump then you need to find a way for any of the thermostats to switch the pump on but just the relevant zone valve. Maybe that is why tado recommend the UH4 controller.

  • Hi Adium,

    Would you have a wiring diagram for using the UH4 & Tado extension kit

    I also have smart theromostat valves in rads up stairs & wish to control H/W I’ve asked Tado for this but just directed me to the pro installer schematics
  • Wires just go from the Tado wall thermostats to the UH4 controller as per the UH4 instructions same as any other thermostat. Nothing else required for UFH.
  • I have exactly the same setup with my vaillant eco plus boiler and a heatmiser uh4 wired to my manifold. I have 3 under floor zones but only 2 thermostats which they say work.

    How does this all wire together? Is there anything special required for the extension kit connection to the boiler? Is it just the regular connection there and then wired thermostats to the uh4 actuators?
  • I got a reply from tado saying that the extension kit needs to be wired via relay - Any ideas?

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