I could see them working, Actually felt the resistance increase, blowing through them, As I walked in from the cold to the warm house.

Drayton's TRV4s set the standards for design, performance and quality, and are now A-Rating for energy efficiency. I want to replace the existing valve bodies with Drayton auto-balancing ones but am unsure whether I should use the TRV4 body (15 settings) or the EB body (6 settings). Drayton has launched its new auto-balancing TRV technology, available for two of its most popular ranges – the iconic TRV4 and RT414.

You can change your choices at any time by visiting Cookie preferences, as described in the Cookie notice. Hi, I need seven angled bodies to fit old ½" pipework and Lightwave Smart thermostatic control heads. If you really want to go down the smart route though a quick google turned up at least one system that says it replaces all the heads on the popular makes. A couple of the holes where the tommy-bar fits had burrs but these were easily removed using a round file. If using wiser controlled heads then only a valve body is needed the wiser head being purchased separately.

I simply took out the worn-out gland seal and replaced it with the new one and it works like a charm. This unit would have got five stars except that the thread that goes into the radiator would benefit from from having a flange to prevent weeping.I'd say that all TRVs have a common thread size but because they are calibrated differently, you need to match the manufacturer / model i.