Why don’t you save your money and fit if you don’t have normal TRV’s and switch the one down to frost protection in the rooms you don’t use. liquid filled TRV’s react to to temperature fluctuations faster.
Standard TRV’s are fine, but you forget to turn them down. With the Hive ones you can set them on a timer so you know they won’t be left on. The Hive heating in general has saved us money on gas as you are more likely to turn the heating off/down if you can do it from the app on your phone, for example if heating comes on at weekend and you’re still in bed, you grab the phone and turn it off.
Enyaq EV