The main difference between a thermostat and a heating programmer lies in their functionality and purpose:
Thermostat: A thermostat is a device that senses and controls the temperature of a specific area, such as a room or a building. It measures the current temperature and compares it to the desired temperature set by the user. When the actual temperature deviates from the set temperature, the thermostat signals the heating or cooling system to turn on or off accordingly. Thermostats are primarily responsible for regulating the temperature in a space and maintaining it at the desired level.
Heating Programmer: A heating programmer, also known as a central heating programmer or time programmer, is a device used to control the timing and operation of a heating system, including hot water and radiator heating. It allows users to set specific time schedules for when the heating system should turn on or off. The programmer typically controls the central heating boiler, circulating pumps, and zone valves. By programming specific on/off periods, users can automate the heating process and ensure that the system operates according to desired time schedules.