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This product is discontinued

Programmable room thermostats

AS2 is battery-powered for applications where no mains supply is readily available to operate the unit, or an existing thermostat is being replaced. Additional features include three standard AA batteries, two years+ battery life, and separate clock power back-up. Battery life is conserved by means of an eight-second autopower-down mode to all indicator lights. Designed for ease of use, with a unique three-button user interface. ThermoPlus allows a high and low-temperature setting to be pre-programmed, with simple user overrides available. ThermoPlus has voltage-free contacts and is ideal for use with combi boilers.

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Model Replacement
Thermoplus AS2 The above unit require a simple wiring change C1727


ThermoPlus can be used with most types of heating system where a simple user interface is beneficial, such as for the elderly and vulnerable.
  • Control of most domestic gas or oil-powered central heating systems
  • Control of additional heating zones
  • Combination (‘combi’) boilers
  • Control of solid-fuel heating systems
  • Replacement of existing thermostats


  • Simple user settings
  • Accessibility features for non-sighted users
  • Safeguard against hypothermia and frost


  • Simple 3-button operation
  • Colour coded, bright LED Warm/Cool display and Braille markings on the main override buttons
  • Preset clock
  • Automatic BST/GMT time change
  • Preset or custom heating profiles
  • Back-lit LCD display
  • Audible and tactile feedback
  • Frost protection
  • 7 years no quibbles warranty


Contact rating 3 (1) Amps 230-240V
Contact type Micro disconnection voltage-free
Reserve battery type Lithium battery
Supply 3 x AA (LR6) batteries
Pollution degree Degree 2
Double insulated Yes
Enclosure protection IP30
Operating temperature range 0 °C to 40 °C
Temperature control range +5 °C to +30 °C
Standby temperature +5 °C to +10 °C
Case material Thermoplastic flame retardant
Dimensions 120 x 90 x 32mm
Display Liquid crystal, back-lit
Clock 24-hour
Displayed time adjustments 1-minute steps
Switched time adjustments 15-minute steps
Operating periods Warm – 3 per-day
Programme settings Auto, Standby
Override Instant Warm/Cool
Mounting Standard wall box fixing