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I appreciate that my use is very simple compared to many and, being retired, we don't have a set regime for heating. I can sit in my chair and say "Google - set the lounge/extension/hall/bedroom TRV to ... degrees". The absolute temperature at the valve is largely irrelevant to me as I can...

Thanks McPrinter. No, the exiting TRVs only receive temperature commands and report existing room temperature at their location (afaik) but will check !? Your last idea of intercepting the switching circuit is also worth investigation !

Thanks again. I'm now going to see if either of the Hive or Drayton App controls can be used in reverse via Google Home enabling commands to be passed to the Zigbee hub !? My IT experience says probably not but we'll see !! If it is possible to do this then it would simplify the operation in...

Thanks everyone for all the comments above. In recap, I already have a Zigbee setup with electronic TRVs that gives me full App control of their functions anywhere and voice control at home as well. My system is a conventional Worcester Bosch boiler with hot water tank - all pumped (see...

Thanks Ian - i'm getting there !! :giggle:

Thanks again - having read through the Hive install and user guides, it's not very clear (to me at least) whether the entry-level 'Hive Thermostat Mini - Model: SLT6' (without a hub in stand-alone mode) gives remote control access at all or whether, if it does, a subscription is required ? Do...

Thanks Ian - yes it is a y-plan setup. I replaced the ST9400c with a new one just after we purchased the bungalow around five years ago as very strange things were happening and, since then, its run fine. I do have connections on 1, 3 and 4 so fingers crossed ! Thanks again for your help.

Hi - it is a completely pumped system (in a bungalow) with a hot water storage tank and a motorised three-position valve to select CH/HW output combinations. It is only this function that I don't have 'smart' control over already - the TRVs are all connected via a Zigbee gateway which gives me...

Hi - yes, if I could control my existing ST9400C over the internet then that would be fine but, as far as I can see, it has no digital control interface ?

Hi - I have a perfectly functioning CH/HW system controlled by a Honeywell ST9400C. I want to be able to control the CH v HW combinations remotely via an App on my phone from anywhere over the Internet. In addition, it would be handy to have internal on/off time bands available as well although...