At the heart of the system will be a time control which can easily be programmed to ensure that your heating and hot water are only switched on when you need them, or more to the point, they are not wasting expensive fuel when the house is empty or while you are asleep. Siemens offers a complete series of programmers that provide the most accurate means of time control, from a dial and sliders unit, to a push-button electronic controller that offers a whole week's schedule of different times. All Siemens programmers are very easy to set and use. Should you wish to start with a simple programmer and at some time change to a more sophisticated one, that’s no problem either. All Siemens programmers are plug-in units employing a standard backplate so that upgrading is very easy. Fitting a Time Control can reduce your fuel bill by up to 15%.