Honeywell ST9100C Single Channel 7-Day Timer The Honeywell Single Channel 7-Day Timer is an electric timer which provides accurate time control for central heating systems and other applications. Designed primarily for control of a single heating zone or combi boiler application. It is suitable for mains, low voltage, or potential-free switching of the heating load. This model is a 7-day timer. It incorporates a Line of Text (LoT) display that gives clear plain English instructions whenever any button or slider is used. This means that installers, customers and users can operate all of the controls reliably, without needing to find an instruction manual. Features and Benefits: Single Channel 7-Day Timer Line of Text (LoT) Display Provides Text Feedback that Gives Help and Programming Hints Large Backlit Display Automatic Summer/Winter 1 Hour Time Change Extra Hour Facility for up to 3 Hours Boost or Programme Extension Can be Set to 5/2 Day or 1 Day Programme During Installation Suitable for Mains, Low Voltage or Potential Free Switching Size: 49 x 113 x 155mm (HWD) 1 Year Manufacturer Guarantee