Which of the following is NOT a primary component of a fire alarm system?

A fire alarm system is designed to detect and alert individuals to the presence of fire or smoke, and it comprises several primary components that facilitate this function. Among these components are the alarm signaling device, which produces audible or visual alerts to notify occupants of a fire; the control panel, which is the brain of the system that processes signals from detection devices and activates alarms; and smoke detectors, which sense smoke particles in the air to identify potential fire hazards.

In contrast, a heating system is not related to the detection of fire or smoke and does not serve any function in the operation of a fire alarm system. Its primary purpose is to maintain a comfortable indoor temperature, which does not directly contribute to fire safety or alarm processes. Therefore, identifying which component is not integral to the fire alarm system is evident, as the heating system does not participate in detecting or signaling a fire emergency.