Horstmann ChannelPlus Four Channel Central Heating and Hot Water Programmer is designed to give independent time control over 4 channels of heating and hot water on a 7 day weekly programme. Each channel offers up to 3 programmed ON/OFF operations per day for each day of the week. The back lit display, automatic clock and menu driven programming are all features designed to make the operation of the ChannelPlus H47XL as simple as possible to use.