Wireless Thermostat Recommendation

Hardware
1

Hi! I am looking for a thermostat and I seem to be having trouble finding something that meets my needs. Maybe any of you can help me.

  1. I want it to be fully locally controlled. No cloud. I already have a Zigbee network, but WiFi is acceptable too.
  2. I am renting and cannot pull wires through walls. The gas heater is in a closet and I would like the thermostat to be outside (for it to measure the actual temp inside my living room). There are dumb RF thermostats that do that: They have a receiver mounted next to the heater and a wireless, battery operated console unit you can move around the house.
  3. The heater is controlled using a dumb on/off dry contact
  4. I want it to still work reliably if the HA server dies (so no DIY software thermostat with a relay and a temp sensor)
  5. I live in the EU, so 230V
2

If you have 230v power near the boiler you can use a smart relay converted to dry contact to start and stop the boiler and a simple temp sensor in the home to get the room temp, then use something like Better Thermostat in ha to automate it.

3

As I said, I would like a solution that doesn’t fail when the HA server dies aka a dedicated thermostat that can work independently. For now, it seems that maybe the Hive ones could work with Z2M? They seem to have this exact receiver-remote configuration that I’m looking for.

4

Sorry, I completely missed your 4th point.
For what is worth in my search for hvac automation I’ve never seen something like you’re describing.

5

Hey mate, did you found ever a solution to this? Im looking for a device with same requirements. Can you please advise some devices?

6

You can use a zigbee temp sensor and relay, but also just have a simple thermostat wired in parallel with the relay. Set the thermostat to a low temperature so it normally won’t do anything, but if HA dies it will keep the house from freezing. That’s how mine is set up.

7

from what I’ve gathered from the OP he cannot run wires from the thermostat to the boiler (but I’m not sure on how the boiler operate right now…)
It may be possible to use a smart thermostat of some kind (HA integrable) and then use the dry contact output to pilot a esp home compatiblem smart relay that has a physical switch input. Flash the esphome relay with a code that does nothing on the “local” relay but intercept the switch input status (open/closed) and send the command (via Wifi) to a second smart switch connected to the boiler itself.

Overly complicated…