Replacement TRVs

slipthru

FreeBear said:

A wet finger or hand is no where near accurate to balance radiators properly. You need a thermometer in the feed and return pipes and adjust the lockshield to get a 15-20°C difference. The pump speed may need to be reduced if you can't get that sort of temperature drop.

Or if you do a search for "dual k type thermometer for pipes", you should find one for between £20 and £40. e,g, https://www.aliexpress.com/item/1005007018010511.html

Thanks, I ordered a cheap infrared thermometer to try and balance them with but I'll take a look at these to.