Zigbee or zwave thermostat that can direct bind control a remote relay?

Hardware
1

Hi all,

What I’m after:

  • a battery powered thermostat
  • that either zigbee2mqtt or zwavejs sees as a thermostat
  • exposes it’s setpoint to be set
  • which can direct bind / associate to a remote relay when the setpoint is reached/left
  • and has (ideally) 0.5C hysteresis

Background: I have FIR panels on the ceiling - hence the need for the relay, and not a boiler controller receiver, because the latter has blinking things on it -, currently driven by ZBMINIs over Zigbee, with Sonoff temperature sensors, and an automation on the controller host as “thermostats”. This doesn’t have a fail-safe that I originally wanted to have, but while the panels are great, the thermostat the manufacturer shipped were absysmal and I have to come up with a working solution, quick.
The trouble is that I don’t have thermostat lines going to these panels, so I can

What I tried and failed with:

  • EFEKTA firmware with the SNZB-02 temperature sensors. Works fine, but remotely setting the setpoints were impossible without waking up the device by pressing the button on them. Furthermore, after about a month, if went into a frenzy of turning on/off multiple times a second
  • various Zigbee thermostats, only to learn that all of them are Tuya TS0601 based in different cases, and this model doesn’t have an OnOff output cluster, so it can’t be the source for direct binding
  • a Z-Wave Secure/Horstman SSR303 receiver + SCS317 thermostat for my boiler control, which works fine, until it gets included in a Z-Wave network: the thermostat doesn’t allow climate controls, the receiver keeps disappearing from the network.

So: is anyone aware of anything that is capable of fulfilling these requirements? The hysteresis is a plus, not a hard requirement, and I’m not afraid of soldering, flashing, etc, but I don’t have the capacity to create my own device within a sensible amount of years.
If not: any suggestions?

2

That sounds like a normal decalcification run.
Smart TRV are usually set to do this once a week to prevent the valve from being blocked in its extremes, which is especially important in the summer periods where the valve might not be exercised at all for months otherwise.
Normally this feature can be disabled somehow.

3

Right, but that thing is not a TRV, it’s a mere temperature/humidity sensor, with a firmware that can get a low/upper setpoint, and direct bind to a relay.

4

As usual, after asking I find a solution:

"Heatit Z-Temp may be associated with the Heatit ZM Single Relay or another Z-Wave relay in order to control many types of heating solutions. "

Which is exactly what I’m after - but I’d so much rather prefer it in Zigbee, mainly because the current system is Zigbee, and Z-Wave is much more expensive. For 9 rooms in the house, the Heatit solution needs a thermostat + a relay, it comes up to nearly €1500 :frowning: