Converting Ideal combi+ logic with wired relay thermostat to Tado on OpenTherm

hannnah

Hello,

I don't know anything about boilers or electrics but I have an Ideal Logic+ Combi C30 boiler and so far I worked out that my current thermostat is a wired Honeywell that clicks on and off. Based on the Tado website, it looked like I could swap this for a wired Tado V3+ starter kit?

However, from looking at this forum, it looks as though I might get efficiency savings if I used OpenTherm. My boiler seems to be compatible with OpenTherm but presumably is not currently wired as such. I've looked for posts about similar situations on this forum, but most people seem to be switching from a wireless receiver. So my question is as follows-

What would be the simplest way of moving from my current setup to Tado via OpenTherm?

Would I need to get an EU wireless Tado installed on the boiler and disconnect the old wired thermostat (making the wires to that redundant)? I'm in the UK but I understand that the UK wireless V3+ doesn't support OpenTherm? Does an EU wireless Tado need to be rewired to a UK plug or is using an adapter sufficient?

Or is there a way to connect the wired Tado V3+ with OpenTherm?

Thanks

policywonk

@hannnah Hi. Assuming that you have no zone valves in your home, that there isnt a HW tank as HW storage point before it comes to the taps, and that your current thermostat is directly wired into the boiler this should only need the following to get going :

• A Wired Tado Thermostat. You'll have to change the wiring from the thermostat and programmer so that only one low voltage pair of wires controlling Opentherm run from the boiler to the Tado thermostat. You'll have to put a loop back in place to ensure the boiler is not controlled by on-off dumb switching - and you'll need to make redundant wires safe.
• A Tado bridge, to enable it all to talk to the Tado server.

You should only need a wireless receiver if there are zone valves being handled through wired thermostats - and therefore you need to operate those with mains voltage off the Tado wired thermostats. They would then wirelessly tell the Tado wireless receiver that they need heat - and itin turn would control boiler output.

Does that help?