Click to enlarge

Directly replaces earlier H21 / H21XL

* Complete with new backplate
* 2 Channel, 24 Hour Programmer
* 5 Year manufacturers warranty
* Large, easy to follow LCD display
* Backlit display (on button press)
* Pre-Set clock
* Automatic Winter/Summer time changes
* Gravity or Fully Pumped system setting
* Up to 3 on/offs per channel in each 24-hour operation
* Holiday programme suspends programme for upto 30 days
* 1 or 2 hour boost and advance on each channel
* Mains powered with battery backup
* Voltage free
* Dimensions: 101x163x33mm HxWxD
* Same backplate as Horstmann 425 and 5 series programmers

Please click here to download the user manual

Replaces (same backplate and wiring for easy changeover):
Honeywell ST1501, ST1000
Horstmann H525, H425 Tiara, Diadem.
Newlec NL425T, NLH21

Compatible alternatives with same backplate & wiring:
Horstmann H27XL - 7 Day version of H21XL