We have an older building with hot water heating (gas), where one pipe heating loop passes through all the apartments.
In each apartment there's a valve and remote actuator (non-electric). These are the closest examples I could find for what's there:
However effective in getting the heat working, these don't provide adequate control of temperature to prevent waste.
People turn on the heat "full blast" then open a window if it gets too hot.
I'm considering replacing these with motorized valves (or just motorized actuators) and thermostats.
Getting all zone loops to start in the basement is not feasible.
Maybe use each apartment's electricity and look for a 120V zone valve?
Or if possible, reuse the existing valve and find a compatible 120V actuator.
Then install a thermostat to work with it that would have some internal limits and anti-tamper?
Any thoughts or suggestions on these?