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Horstmann 425 Tiara Programmer

Product Code: 18470

Common timing. 3-wire installation. Override facility. BS EN 60730-2-7: 1992 and 8182 / 8319, BS EN 50081-1 and BS EN 50082-1: 1992.

  • 24 Hour Programmable
  • 26 Pre-Set Programmes
  • 2 On/Off Periods per Day
  • Suitable for Gravity-Fed & Pumped Systems
  • 2 Year Manufacturer's Guarantee
  • 3-Wire Installation
  • Energy Saving Trust Approved
  • View more information

Switch/contact rating: 6A. H x W x D: 112 x 153 x 33mm. Backplate fit: 9-way (included). Not suitable for underfloor heating.

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Horstmann 425 Tiara Programmer Instruction Manual


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Horstmann 425 Tiara Programmer 4.2 5 22 22
Horstmann Tiara 25 The Horstmann Tiara 25 timer packed up after many years of trouble free service so I needed a quick replacement, so power off, undo two screws and pulled off timer front then replaced with new one, two screws tightened, power on and we were back to trouble free heating and hot water. Screwfix click and collect proved excellent and they offered the cheapest price therefore they come well recommended 11 Apr 2015
Horstmann 425 Generally a very simple to use CH programmer. Don't make the mistake of model types if you want the neon 'on' 'off' indicators which are not on this model. The step forward is a very useful function although the step numbers are difficult to see if you are installing for someone who may not have good vision. 17 Jan 2015
basic timer I bought and fitted this timer for my mother ,who is 75 years old.i know if I bought an all singing all dancing timer I would be round at her house every day showing her how to use it and what each button did.she doesn't need a 5/2 day timer or one that knows when you're on holiday.its simple it does the job 19 Dec 2014
Ok programmer A basic non digital programmer for people that don't like setting digital over complicated timers.will suit the old that have basic boiler/ pump central heating systems. 14 Dec 2014
  • 2015-05-21T14:41:09.454-05:00
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Brand Horstmann
Installation Type 3-Wire Installation
Manufacturer Guarantee 2 years
Model Name Tiara
Model No 425
Pack Size 1
Product Depth 33 mm
Product Height 112 mm
Product Type Programmer
Product Width 153 mm
Programme Facility 24 Hour Programmable
Suitable System Suitable for Gravity-Fed & Pumped Systems
Total Product Weight 0.43 kg