I have found a product that is a zigbee pro line voltage from Walker Technologies.
Wireless Baseboard Thermostat
Part Number: WZ_LVS250
The WZ_LVS250 Wireless Baseboard Thermostat replaces the old mechanical baseboard thermostat without requiring installation of extra wires for communication or power. Using the ZigBee protocol, the WZ_LVS250 provides wireless relay control of one zone of 120 or 240 VAC baseboard heaters. It connects to a central monitoring station to allow for monitoring and changing of parameters.
Using the built in motion detector and Walker’s Temperature Predictor the WZ_LVS250 controls the baseboard heater to give the room a stable and comfortable temperature while at the same time reducing energy.
I’m in contact with one of their team. What would be necessary in terms of access to their zigbee syntax for increasing it into ST? I’m no Python expert - I’m a hardware person - so any tips on what to request would be great.
This is the only option for home automation with line voltage baseboards except Caleo which isn’t available AND uses WiFi and a server.