Adding a wireless thermostat to VRC700 controller and VR921 sensoNET internet gateway

[DownhillDIYer]

Hi. I have a Vaillant aroTHERM plus heat pump with VRC700 controller and VR921 sensoNET internet gateway. I'm currently using Tado to turn the heating on and off. I'm looking to have the Vaillant system control the heating on/off instead.

The heat pump has the VRC700 controller and VR921 sensoNET internet gateway installed. The heat pump, controller and internet gateway are all installed in my garage. I need to add a Vaillant wireless thermostat to the system for the controller to be able to measure the internal temperature in my house (probably installed in the hall).

Does anyone know if there's a way to add a wireless thermostat to the installation without having to replace the VRC700 and the VR921?

 

[DownhillDIYer]

It looks like the Vaillant ambiSENSE VR51 would have been compatible but it seems to be discontinued and I can't find it available to buy online or even on eBay