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This product is discontinued

Electronic Programmer

A 3-channel programmer giving independent timing of each channel on a 7-day programmer. Designed for use with fully pumped central heating systems, using three separate two-port zone valves. Ideal for the control of two heating zones as well as hot water via separate thermostats and zone valves (e.g. zones 1, 2 and 3 or hot water, heating 1 and 2).

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Model Replacement
ChannelPlus H37 The above units use the same backplate as H3747 and only requires a simple wiring change H3747


  • Time control of most domestic gas or oil-fired central heating systems
  • Combi boilers
  • Stored HW systems
  • Underfloor heating systems
  • Zone Control – time control of multiple heating zones


  • Flexible controls
  • No need to worry about resetting the clock for Summer/ Winter time changes


  • 3 channels
  • Back-lit LCD display
  • Preset clock
  • Automatic Winter / Summertime changes
  • Simplified menu-driven programming
  • Advance and boost on each channel
  • 7-day operation
  • 7 years no quibbles warranty


Contact rating 3 (1) Amps 230V AC
Contact type Micro-disconnection wetted terminals (not H37XL)
Supply 230V 50 Hz
Rated impulse voltage Cat 2 – 2500V
Battery Lithium
Pollution degree Degree 2
Enclosure protection IP30
Double insulated Yes
Operating temperature range 0° C to 40 °c
Case material Thermoplastic flame retardant
Dimensions 101 x 163 x 37mm
Display Back-lit liquid crystal
Clock 24-hour or 12-hour am/pm
Displayed time adjustments 1-minute steps
Switched time adjustments 10-minute steps
Programme options On, Off, All Day, Auto & Holiday
Operating periods per-day 3 for each channel
Override (each channel) 1 or 2-hour boost or 2-hour extension to On period, instant advance
Mounting 9-pin wall fixing plate
Enclosure protection Flame retardant thermoplastic