Horstmann 425D Diadem Programmer
This twin circuit, hot water and central heating programmer, with indicator lights,
- 16 programmes available for fully pumped systems, including independent programming of heating and hot water
and 10 programmes for gravity HW/pumped CH systems. Programmes allow permanently ON or OFF, On all day or ON/OFF twice a day.
- An advance switch gives temporary override without altering settings.
- The Diadem is ideal for gravity systems and fully pumped systems with spring return zone valves.