Strom Twin Channel Programmer is ideal for use with combi boilers for controlling a heating zone and hot water. The simple and stylish design has a large, clear and easy to read display making it easy to navigate and use. It can be programmed for 2-3 on/off periods a day and either a 7 day, 5/2 day or 24-hour cycle. It features a holiday mode with up to 99 days to save on heating bills.