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425D Diadem Central Heating Programmer

  part of  Horstmann Programmers
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425D Diadem Central Heating Programmer 425 Diadem  
425D Diadem Central Heating Programmer

Width: - 152mm
Height: - 107mm
Depth: - 39mm
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.
Technical: Horstmann Data & Wiring Sheet + Compatability list 
Order Code Description Price (ex vat) Qty    
HO 425D425D Diadem Central Heating Programmer (Extended Range*)
EAEA 3+
41.0539.55
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