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This product is discontinued

Electronic time control

CentaurPlus C27 is a 2 channel 7-day control, allowing independent time control of central heating and hot water. Highly popular and affordable, with the latest Series 2 now featuring a backlit display, and incorporating an automatic GMT/BST clock. All models feature an industry-standard six-pin backplate which permits easy replacement/upgrade. The C17 is suitable for use with combi boilers, and the C27 is ideal for non-combi boiler installations where a hot water cylinder is in use.

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Model Replacement
CentaurPlus C27 The above unit requires a simple wiring change C1727


  • Control of most domestic gas or oil-fired central heating and hot water systems
  • Combination (‘combi’) boiler systems
  • Stored hot water systems
  • Solid-fuel systems
  • Additional zone control


  • Standard wall plate – simple to plug-in and replace
  • Direct replacement for many competitor products


  • 7-day programming
  • Up to 3 On/Off’s a day
  • Hot water boost and central heating advance
  • Programme options: On, Off, All day or Auto
  • Mains powered with battery back-up
  • 7 years no quibbles warranty



Contact rating 3 (1) Amps 230V AC
Contact type Micro-disconnection Voltage-free C17 only)
Rated impulse voltage Cat 2 – 2500V
Supply 230V AC 50Hz only
Pollution degree Degree 2
Class a software Type 1 Control
Operating temperature range 0 °C to +40 °C
Battery life Minimum 10 months continuous operation
Case material Thermoplastic flame retardant
Dimensions 84 x 150 x 29mm
Display Back-lit liquid crystal
Clock 12-hour am/pm Auto BST/GMT changeover
Displayed time adjustments 1-minute steps
Switched time adjustments 10-minute steps
Operating periods 3 per-day per-channel. Separate programmes possible for each day of the week
Override C17: 1-hour boost, 1- hour extension to On period & Instant advance
C27: 1-hour boost (HW only), 1-hour extension to On period (HW only) and instant advance (CH only)
Mounting 6 terminal plug-in wall plate
Enclosure protection Flame retardant thermoplastic
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