Underfloor heating manifold control

I want to set up a system based exclusively on a SonOff devices and eWeLink to control my underfloor heating manifold. Basically I want to use SNZB-02D temp indicators in different rooms to control SonOff Mini R4 mains switches. The switches simply put 240 volts directly onto thermoelectric actuators which simply open the valve to let the hot water through on the manifold. The actuators only consume one or two watts and they stay energized all the while you require heating water flowing. I envisaged using several scenes to set up different temperatures bands, so to set 20 degrees I would have a scene to activate at 19 degrees and deactivate at 21 degrees. When that scene is activated I would use the same scene to deactivate any other set point scenes for that zone. When any scene is calling for heat it would operate another couple of switches [with clean contacts] to control the circulating pump and manifold zone valve. I need another scene to turn off the heating altogether and that would simply deactivate all the set point scenes and then turn off the circulating pump and manifold zone valve. At the moment I’m only using one temperature controller to control everything as I develop the system. But I’m already experiencing problems that I don’t know how to solve. I think it’s to do with establishing initial conditions before a set point scene takes over.

I was hoping somebody would have already broke the back of this exercise and would be able to share some information with me, which will be gratefully received. At the moment I am only using a mobile phone interface but obviously would expand to voice control from Alexa. Would I need one of the SonOff NS control panels to realise my ambition. Thanks Mark.

Sent from my Galaxy

I would control things that important locally either using an iHost or possibly a NS Panel Pro (I would be careful there as I’m not sure which scenes run locally and which need the internet). If you run everything locally and the internet fails you can are okay if all your scenes are local. It sounds like you just need an iHost, a bunch of Zigbee minis (1 for each switch) and a bunch of Zigbee temperature sensors (1 for each room). If you need a touch display you can probably do it with an NS Panel Pro. If you go the iHost route then you can install Node Red and creating the scenes becomes easier.