The 425 Diadem is a twin circuit, hot water and central heating programmer, with indicator lights, has 16 programmes available for fully pumped systems, including independent programming of heating and hot water and 10 programmes for gravity HW / pumped CH systems. The Diadem is ideal for gravity systems and fully pumped systems with zone valves.
Simple to use with easily understood settings adjusted in seconds
Easy to install using a nine pin backplate
Advance control to allow manual override on or off