Which symbol represents a heating thermostat?

The symbol that represents a heating thermostat is a circle with a 'T' inside. This design is widely recognized in electrical schematics and HVAC diagrams to denote a thermostat's function. The 'T' specifically indicates temperature control, linking it directly to the device's purpose of regulating heating systems based on temperature settings.

A heating thermostat typically works by sensing the ambient temperature and ensuring that the heating system operates until the desired temperature is achieved. This symbol effectively communicates its role in the overall system layout, facilitating easier understanding for technicians and engineers when assessing HVAC configurations.

The other symbols do not accurately represent a heating thermostat. For instance, a circle with a line through it might signify various other components depending on the context, while a triangle with a dot could represent different types of electrical devices or indicators. Additionally, a square with a temperature scale typically signifies temperature measurement devices rather than control devices. Thus, the circle with the 'T' is specifically designated for a heating thermostat, making it the correct identification for this component.