I have it running through ZHA and it works well. It is quiet and looks relatively nice. Sure it doesn’t have all the features like the expensive ones, but the price is right. Here is a picture of what was detected with me everything. The temperature is adjusted with me with a NETATMO thermometer and the HACS addon Betterthermostat.
I basically confirm what you say. I bought it on Amazon in a happy moment and paid only €30 for it. I use it with zha. The major limitation that the classic Tuyas do not have is the impossibility of calibrating the temperature measured by the valve with ZHA. If your radiator is behind a curtain or in a niche you will not be able to manage the set point effectively as the measured temperature is affected by the lack of air circulation. I had to manage it with a generic thermosat entity that turns the valve positioned at a very high set point on and off and an external temperature sensor, but this eliminates the convenience of manual adjustment.
I’m using it and I have to say that it works well, the only thing it doesn’t have that would be useful to me is the positioning of the valve.
I don’t understand if the TRV really doesn’t have it in its features or it’s a question of software not yet developed…
I agree with all the comments here. However my issue is that when I set the temperature very low (about 10 degree C lower than the sensor value), it doesn’t turn the valve off, so the radiator still gets hot water circulating. Does this require some sort of calibration for the valve position (like the Aqara E1)? I couldn’t find any valve position calibration info in any documentation or forum.
today, i was looking at the TRV calibratior blueprint, first worked fine, but then i noticed my 2 TRVs were connected?!? When i adjust the temp on n°1, n°2 is autoset that temp. strange…
My sonoff trvs do turn the rads completely off. I had a couple that did not, and realised I wasn’t using new batteries when calibrating the valve.
Take them off, check the valve pin is loosened up(use a flat bladed screwdriver to exercise it a bit) reinstall with fresh batteries and recalibrate.
I have one rad where I cannot stop the flow with a screwdriver and therefore the sonoff cannot completely stop the flow either - I will be pipe freezing the tail and replacing that valve soon.