Which TRV has lowest battery drain?

Thanks for your replies (and the warning about Fibaro, which having read about I will skip)

It seems Aeotec also has a FLiRS specified TRV that is not originally Popp. I assume this might suffer the same Homey incomplete FLiRS implementation problem that might be the cause of the Fibraro issues? Does anyone have experience of this TRV? An Amazon review describes this as originally from original from manufacturer Eurotronic, and it seems plenty of issues with these and Homey too.

It seems Tuya has a Zigbee TRV, but it doesn’t seem to be listed in the devices in the Tuya Zigbee app

Batteries in my tado TRVs last about 18 months to 2 years.
@Adrian_Rockall That’s good to know. I’m not wild about about adding yet another bridge (or the expense) though…