Support current and more recent Vaillant eBus controllers

Tado asserts the benefits of modulating boiler control and touts compatibility with Valiant and eBus. However, the reality is rather grim. It turns out that as of 2019-03 eBus is only supported in these scenarios using the now discontinued VR65 controller. No other controllers are supported (VR66 for example). This means that tado has very limited Vaillant/eBus compatibility and most will be forced to use only binary switched live controls, and not benefit from the additional comfort and efficiency provided by modulated control.

Please can we see some efforts to keep pace with what I imagine is a relatively slow moving target. It is sad that in 2019 one of the leading smart thermostats constrains home owners into choosing outmoded and inefficient control methods.

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  • FrankFrank | Admin


    Unfortunately we have to reverse-engineer most interfaces from scratch as not all boiler manufacturers are interested in a partnership or in assisting an alternative control device to their own, hence it can take time to do so properly (assuming that there are no legal issues preventing us from doing so).

    Best regards,


  • @teabot @Frank

    I hope Tado do eventually succeed in reverse engineering the new VR66 controller.

    In the meantime another possible but less than ideal solution might be to use the Valiant VR33 OpenTherm conversion module. See -

    This is actually an official Valiant part but is intended only for sale in the Netherlands which may have a local requirement for the use of OpenTherm compatible products.

    Tado is as far as I can tell unique in supporting both eBus and OpenTherm protocols - most other smart thermostats support either OpenTherm and on/off control but not eBus, for example Nest v3 supports OpenTherm but not eBus.

    However be warned even though the above VR33 part is a genuine Valiant part and even if you get it fitted by an approved engineer Valiant will consider this to invalidate any warranty - at least here in the UK.

    Tado regard eBus as being superior to OpenTherm but OpenTherm does still give you the most important benefit of modulated control.

    This news however might lend additional weight to my plans to get a Worcester Bosch boiler instead.

  • JurianJurian | Admin

    @teabot @jelockwood

    As teabot already pointed out, we can control "system boilers" using Vaillant eBus when you use the VR65 mixing module. You might still be able to pick up this module from the 2nd hand market.

    An alternative might also be to go for the "Glowworm Smart Wiring Centre 2". We can control that box using Glowworm eBUS and this would allow you to have a system boiler that is being controlled in a modulating way.

    Alternatively, you can always opt to for a combi boiler from a brand where we support the digital interface:

  • @Jurian I have a multi-zone system with a combi boiler as the attached diagram. Will 2 tado room thermostats work in this configuration with Glow-worm smart wiring centre 2?

  • Got to add me the line of the inquiry if anyone has had success in using the smart-wiring centre on a vaillant or similar system? Got my hand of a v3 Tado start-up set but having a Protherm Gepard gas combi-boiler, I am reluctant to miss out on the possibility to use the modulation-capacity of the system. The alternative is to get a Vsmart Vaillant control or as it is marketed here, the Migo thermostat, with its limited functions, but profiting from its more energy-efficiency.

    regards from CZ, mirrormurr

  • I was initially puzzled by Jurian's suggestion to use the Glowworm wiring centre since Glowworm is a different brand and one might think the wiring centre was therefore for use only with Glowworm boilers and not Vaillant boilers which was the original query.

    However for anyone else also puzzled by this Glowworm was purchased by Vaillant in 2001. I am still not 100% convinced this means the Glowworm Smart Wiring Centre 2 would work with a Vaillant boiler but it increases the chances it would. It would be a way to use a Glowworm boiler with a Tado Smart Thermostat.

    I found a more complete copy of the manual for the Glowworm Wiring Centre 2 here -

    It still raises other concerns, apart from it looking a lot more complex I would have thought it was possible it might result in any warranty being invalidated. It is already the case that fitting a Vaillant VR33 module to convert a Vaillant boiler from eBus to OpenTherm invalidates the warranty and remember this is a genuine Vaillant part and far easier to fit.

    In my case I am considering a Worcester Bosch boiler instead which like Vaillant uses eBus but unlike Vaillant is apparently still supported by Tado but others might want to look at other brands which support OpenTherm natively e.g. Baxi.

  • After numerous contact with customer support with the confirmation of the compatibility with the eBus system, I took the chance and had the Tado installed for our small Vaillant boiler, the Protherm Gepard, and can confirm the inability of the Tado system to be controlling the temperature of the hot-water and the radiator-temperature.

    Basically, Tado is just an expensive remote on-off switch...-guess I should have gone for Protherms own products, namely the Vsmart or as its called here, the Migo Thermostat. *sigh*

  • Is there any news on support for the Vaillant VR66? I'm "unfortunate" enough to have one fitted in my new house. Or is there a list or someway I can be notified of updates?

  • @AdrianC @mirrormurr

    I fortunately have not yet bought a new boiler but all this is convincing me to go for Worcester Bosch rather than Vaillant.

    I think your best option is as previously suggested by Tado to try and find an older VR65 controller module and get that fitted to 'downgrade' your boiler. I did a quick search on eBay and there seem to be a number listed.

    It should be noted there is the potential for a similar compatibility issue with Worcester Bosch. British Gas make a module for Worcester Bosch boilers called Boiler IQ. This module sends diagnostic information to British Gas over the Internet. However if you have this fitted it at a minimum prevents Tado's own diagnostic reporting and might also prevent eBus working altogether.

    Hive an alternative smart thermostat solution has been designed so it can work alongside Boiler IQ. It does this by accessing British Gas' cloud service and downloading the diagnostic information from that. I believe Hive is actually owned by British Gas.

    This is a shame as I might have gone for the Boiler IQ module/service. Thankfully I discovered this in advance.

  • For those of you interested, I’m able to control my Vaillant boiler from Tado. A bit complex to setup but work perfectly...

    in a nutshell:

    • My Tado thermostat is not wired to my Vaillant boiler
    • I’ve setup a node-red flow that periodically check, via Tado API, the requested temperature in each of my rooms vs the current temperature of that room. So I got a delta per room. My script takes note of the highest delta.
    • then my flow talks to my Vaillant boiler using ebusd ruining on my RPI - it “adds” the highest delta to the current temperature in the room where the Vaillant thermostat stands: this causes the boiler to turn on.


    • Room 1: living room with Vaillant thermostat and Tado thermostat and valves
    • Room 2: bathroom with Tado valves
    • Temp in Room 1: 20, asked temp: 20 so delta is 0
    • Temp in Room 2: 18, asked temp: 22 so delta is 4
    • Therefore highest delta is 4
    • Then I take the temperature of the room where the Vaillant thermostat is (20), add the highest delta (4). This gives 24; then I instruct Vaillant boiler that my desired temp is 24.
    • every 30 seconds, routine is executed again


    • Works with all Vaillant equipment supported by ebusd
    • Reliable: have been using it for months without any issue
    • Benefits from the Vaillant regulation


    • If Tado turns down their API, I have a serious issue :)

    if anyone is interested, I could take some time and write a tutorial...

  • @beetlejuice

    Congratulations. Your effort goes beyond my desire or knowledge, it does however sound like ebusd understands or at least better understands Vaillant's variety of eBus protocol than Tado do.

    This would suggest it might be worth Tado studying the implementation in ebusd for hints on how to resolve their compatibility issue.

    For the benefit of Tado you should look at the following links -

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