why do you use ZHA instead of Zigbee2mqtt?
Hi. I wondered where you found these TRVs as cheap as you say. I found one for 25 EUR, but the others were 60 EUR or more, and that is nearing the price of Shellys.
See previous response: seems like the prices skyrocketed since the war in Ukraine.
I payed 15 € at my local DIY store before I bought the rest s/h for even less.