Leaderboard

There used to be a real problem with putting Thermostatic Radiators Valves (TRV’s) on the return. As the TRV just opening or closing the dynamics of the flow would cause the valve to snap shut and then open repeatedly, this sounded like a machine gun. Most TRV’s are now bi-directional (as yours is) that is they can be fitted on the flow or the return. In your case pipe the radiator as is and put the TRV on the side with the best air flow.