Many different control deices are available for heating systems, and these devices control both actual heat and also at what point the system starts and stops. There are thermostatic, time and zone control devices. The ultimate achievement would be to make a heating system very economical and efficient. Edgeware Plumbers fit heating control devices. Thermostat:Both manual and digital thermostats are available. These devices turn the heating on and off in accordance with the selected temperature. Mainly fitted in a lounge or a hall, it assumes that a rise or drop in temperature in its vicinity will be mirrored by the same rise or drop throughout the house. These are available in wired or wireless digital versions.Thermostatic Radiator Valves (TRVs):The heat that is generated by a radiator was normally adjusted by opening or closing a manual radiator valve. There is now a much more efficient way to achieve this and that is by using a thermostatic valve or even better a programmable thermostatic valve which will maintain the desired temperature at pre-set times during the day. An Edgeware Plumber can fit TRVs.Timers and Programmers:These are relatively simple time switches that will turn a system on and off at preset times, but with a programmer that allows independent operation of the heating and hot water circuits.Cylinder Thermostats:Water temperature that is required to heat a radiator is far greater than that required at the taps (82C rather than 60C) and the cylinder thermostat stops overheating of a hot water supply. This thermostat works by shutting off the water flow to the heat exchanger as the temperature increases, and opening up as the temperature decreases.Zone Control Valves:Zone control valves are operated by using an electric motor. They are also known as a mid-position valve which can shut off parts of a system at a very specific time or indeed times of a day. They are great in the larger property, where you do not want or need to heat all the upper floor bedrooms, and are required in heating systems that have to heat in excess of 150 m?.