I’m looking for a replacement of a subpar Avatto Zigbee TRV. What I don’t like is the binary operation (valve is either fully closed or fully open, resulting in fluctuations, noise and short battery life). Also having to rely on things like Better Thermostat to connect the TRV with an external thermometer is wonky at best and usually doesn’t work at all.
I see some mentions of Danfoss Ally that should have everything I would use Better Thermostat for built in (external thermometer link, proportional operation and open window sensing).
Question is: does it work and is it well integrated with HA (with Zigbee2MQTT) as of Sept 2024? I see a lot of unanswered questions that do not exactly fill me with confidence.
Any tips and experiences? Thanks!
Edit: I know it’s supported by Zigbee2MQTT. I’m asking about specific experiences and mostly the external sensor integration.
It seems to be supported by Z2M.
Yes I know, thanks. I’m asking about specific experiences and mostly the external sensor integration.
Ok. I have no experience with it, sorry.
I want to know that too. I recently switched to z2m from zha because my SONOFF ZMINI-L kept dropping off the zigbee network. I haven’t experienced that with z2m so I would be sorry to find out that I can’t get my new thermostats to work 
Any takers?
I bit the bullet and bought it, it works well with Zigbee2MQTT. I haven’t yet tried to assign external thermometer sensors to it. Turns out I don’t really need that much control in our apartment.
Thanks. I’m not at that stage yet but we’ll see if I change my mind in the future 
Having moved in a new flat where all the heating is handled by hot water radiator (my previous flat was only electrical radiator), I’m also in the process of finding the perfect eTRV for all the radiator (there is 9 in the appartement)
I started by looking at the sonoff TRVZB because they are cheap but quickly changed my mind after seeing that they are only on/off (they open the valve either 0% or 100%). Apparently there are ways of precisely controlling the valve using the minimum and maximum opening property, but that would mean relying only on home assistant (and probably better thermostat) for thermo-regulation.
Then I started looking at the danfoss ally because it uses a PID algorithm (regulate precisely the valve), they are silent and they are well integrated in z2m.
I’ve been using one danfoss ally TRV for a week now and my experience is mixed.
First of all they are “okay” silent, you can definitely hear it when the valve moves but on the other hand, thanks to the PID implementation, the valve moves very rarely
Secondly the valve is indeed well integrated with zigbee2mqtt, however the official danfoss gateway does a few things that z2m obviously does not. Like computing the room mean for loadbalancing, etc. For now, I got a home assistant blue print on this forum to calculate and update the value just like the official gateway.
And finally, my biggest point for now, is that the valve has trouble following my setpoint. I asked for 19°C in the room where the valve sits, the internal thermometer of the valve was measuring 20.1°C and my external thermometer (an aqara temp and humidity sensor) was measuring 21.5°C (this thermometer is fed back to the valve using an home assistant automation) and yet, with all that information, the valve was still opened at 100%. So I’m not truly understanding how the valve is really working.
I’ve ordered two more valves to do more tests in more room and I’ll keep you updated how it turns out.
PS: For now I don’t see a value in better thermostat, the PID controller onboard is supposed to be quite good, and external thermometer and external window opening sensor is already supported natively