I am in a high rise built in the early seventies. The hot water is provided by the building gas furnace, it heats the apartment via baseboard radiators. I have a downright ancient thermostat on the wall which I believe to be a Siemens Powers 192 or similar. It looks like one and it hisses when it switches on :) and a sparkie already looked at it hoping to replace it with a modern one and said it was not electric but pneumatic.
I would like to upgrade. While I know nothing about this, the way I imagine there is a pump which gets switched on by the thermostat using pneumatics. I guess I could get it modernized and get an electric switch setting going on -- I presume I would need to get a licensed/insured professional to do this. Then comes the question of the thermostat. Again, without knowing much about the system, I presume a thermostat is just a glorified switch.
The way I imagine this could work without running new wires is Powerline Ethernet or similar. In my dreams I would have
[pump] -- [Powerline Ethernet converter] -- [existing power cable] -- [Powerline Ethernet Thermostat receiver] -- [Wireless thermostat unit].
(There's just no way for the wireless unit to reach the pump directly.)
Is this actually doable? I do not want to connect my heating to the Internet.