Mechanical heat detectors are typically lower in cost than electronic heat detectors and are also typically able to be reset after signaling an alarm.

• A. True
• B. False
• C. Depends on model
• D. Rarely used

Answer: (B)

Mechanical heat detectors rely on simple metal components, which keeps their price low. But many of these devices are one-shot: when a heat event occurs, the element permanently changes state (a fusible link melts or a bimetal latch snaps) and cannot be reset in place. To reuse, you must replace the detector or the fuse element. Electronic heat detectors, while usually pricier, offer reset options via the control panel or manual reset mechanisms. Therefore, while mechanical detectors are often cheaper, they are not typically resettable after signaling, making the statement false.