Installing Tado on a Glow Worm Energy 30c Combi

[DIY_Doctor]

Hi all,

Hoping to gain some advice please.

I have a Glow Worm Energy 30c Combi boiler installed in 2020.

I've bought a Tado system - I went for the UK V3+ version as I didn't think my boiler supported OpenTherm. However, from reading around it appears it is a modulating boiler, but uses its own eBUS interface to communicate with the wireless ClimaPro2 thermostat rather than OpenTherm. Have I got that right?

As such, is there a way to connect my Tado system with this boiler? Is this done only by wiring into the 230V block (X1 in diagram below) to turn the boiler on/off, or is there a way to keep the boiler's modulating capabilities? The instructions I've received from Tado after specifying my boiler only mention to wire the Tado wireless receiver into the the 230V terminal block but make no mention of what to do with the existing ClimaPro2 wiring (X106 block).

Grateful for your thoughts?

 

[ianmcd]

you must wire the Tado into the on/off terminals, the climapro interface will not work with Tado, but you are mistaken the boiler will still modulate when wired on/off

 

[DIY_Doctor]

you must wire the Tado into the on/off terminals, the climapro interface will not work with Tado, but you are mistaken the boiler will still modulate when wired on/off

Thanks for your reply Ian.

Just to be clear I have a wireless Tado receiver (UK version) which gets wired into the boiler. By on/off terminals do you mean the 230V power supply terminal X1 on my diagram? If so that would mean connecting brown to live, blue to neutral, grey to RT and black capped as per Tado's instructions.

What about the terminal X106 on my diagram? I presume I disconnect my existing wireless receiver from the BUS terminals which is how Glow worm's own thermostat communicates with its modulating function. Is this correct? How would Tado communicate with the boilers modulating function if its just connected to the on/off terminal?

 

[CBW]

How would Tado communicate with the boilers modulating function if its just connected to the on/off terminal?

It doesn’t, the boiler will modulate down better using its own controls as that’s the best way, on/off will come on high and go off high, and might overshoot the temperature.

 

[RandomGrinch]

It doesn’t, the boiler will modulate down better using its own controls as that’s the best way, on/off will come on high and go off high, and might overshoot the temperature.

Agreed, but for the aid of the OP - the boiler can still modulate by itself, based on its flow and return temperatures.
This is a far cruder and less efficient method, than allowing the clever algorithms in an eBus thermostat to manage the boilers modulation.