Tools Required.Adjustable Spanner,Wire wool.TRV.New connector if needed.PTFE tape.The old way of heat control on radiator was a single open and close valve known as a manual valve, and of course the room thermostat. Historically fitted in a lounge or hallway. This is fine but to satisfy our energy and heat saving needs it will not give an accurate temperature spread in the whole house, meaning that there is a massive variation in heat in different rooms. The only way to correct this as it stands is to adjust the manual radiator valve on each radiator, which is not practical or efficient. Therefore the best solution is to fit TRVs and allow the individual radiators to produce heat at a a pre-set temperature instead. In almost all situations, the fit will just be a straight swap for the current manual valve. Croydon Plumbers can fit thermostatic valves throughout a system.Method:1a). Before you begin you must carry out a drain of the whole system. When the system is empty you can undo the cap nut and remove the old manual valve. Slacken off the nut holding the valve to the pipe and then, undo both nuts completely and lift the valve together with its cap-nut and olive from the end of the pipe.1b). Now, using some wire wool clean the pipe end and place the cap-nut and olive of the TRV on. Make sure that you hold the new valve and screw the cap-nut on the TRV. Always make sure the olive is sat correctly. There is no need to tighten fully just yet. A Croydon Plumber is skilled and can fit a thermostatic radiator valve.2). If required you should fit a new connector on the radiator. Now, wrap some PTFE tape around the threads. With them aligned correctly you can start tightening both cap-nuts fully. 3). Refill the system, checking for leaks and lastly you can now set the thermostat valve as described in the manufacturer’s instructions.