Combining the best of Tado and Nest?
I realise the title of this post may sound odd or even controversial but here goes. My system is very conventional (read old fashioned) consisting of a 16 year old Viessman 100 WB1 boiler, gravity fed (tank in roof space) and I believe what is called a Y plan layout with separate two-way valves controlling the heating and the hot water. About ten years ago I bought a Nest 3rd gen thermostat and it was a revelation with it ability to set precise schedules , its learning capabilities and of course its gorgeous looks. Last year things moved on even further with the purchase of Tado Smart Radiator valves to fit most of my radiators (left off the ones in the two bathrooms to allow the water to circulate).
So far so good but as brilliant as the Nest is it does not of course have smart radiator valves as part of its system or have the ability to "talk" to Tado or other systems (for understandable but annoying commercial reasons). To gain this functionality I could of course ditch the Nest and replace it with the Tado smart thermostat. Many on here appear to have done that but I am quite reluctant. In my view the Nest thermostat beats the Tado hands down in every department other than smart radiator valve integration. It looks better, it is better built , the Farsight facility is really useful etc etc.
So, how to resolve this quandary? It then occurred to me what if I kept both? My first idea was to just have the Nest "receiver" (the hard wired bit) powered up with live and neutral (and earth if there is one) simply to act as a transformer to the Nest thermostat. However the switching would be done by the Tado receiver (same live, neutral powering it as the Nest) but with the actual on/off for the hot water and central heating done by Tado using its receiver and (wireless) thermostat. The latter could be in the vicinity of the Nest thermostat and would be doing the work but I would assume the Nest would continue to show the temperature, whether it is heating or not etc since it does not know that it is no longer connected to the boiler.
Having got so far my second thought was why bother with the hot water control on the Tado since the Nest performs that function the same - so just leave that as it is and have just the central heating controlled by the Tado.
My final thought - and it has only just occurred to me while typing this is why not duplicate everything between the two receiver boxes. So either or both can call for heat at the same or different times. Presumably the boiler won't know or care where it gets its power from. This way ensures that the Nest continues to be useful and the Tado is there to provide the smart integration with the valves.
Any thoughts anyone? Am I completely mad? The cost after all- of buying the Tado thermostat will be the same if I am replacing the Nest or have it running alongside the Tado.
I can't think the electrics will be a problem since it will be the same live and neutral going to their respective terminals in both receiver boxes and the same outputs to the central heating part of the boiler (I won't bother to duplicate the hot water) so the boiler will simply respond to the first box to turn it on and the last to turn it off.
I hope I have described things clearly enough for you to comment - if you wish.