Horstmann Programmer Channelplus XL H21 24 Hour

Horstmann Programmer Channelplus XL H21 24 Hour


Product Code: NU0570221000

Ex Tax: £50.05

Horstmann Programmer Channelplus XL H21 24 Hour

  • 5 Year Guarantee.
  • Unique 3 channel programming.
  • Part L Compliant 3 Amp rated.
  • Single, Two and Three channel versions.
  • 24 hour or 7 day programming.
  • Large, easy to follow LCD displays, give clear programme information.
  • Up to 3 ON/OFF periods per channel in each 24 hour operation.
  • On 7 day models different settings for each day of the week.
  • One touch holiday setting, suspends programme for up to 30 days.
  • 1 or 2 hour boost and advance on each channel.
  • Mains powered with battery back up.
  • 3 Amp changeover contacts.
  • Single and Two channel versions are voltage free as standard, a Volt free Three channel is also available Uses same backplate as Horstmann's 425 and 5 Series programmers and can plug in as a direct replacement on most models.
  • Product Data Sheet
  • User Guide
  • Installation Guide

Second generation programmers that offer up to three independent channels and feature improved display and easier programming.

Normally same day dispatch


Hi – I currently have a Switchmaster 400 programmer which has stopped working, can you advise of a suitable replacement with simple wiring configuration please.


Thank you for your enquiry - Please find product page link for the Horstmann H21
which is a suitable replacement for the Switchmaster 400 and only requires simple
rewiring at the programmer backplate as attached wiring guide from Horstmann