What device is commonly used to indicate a gas leak?

A gas detector is specifically designed to identify the presence of gas in the environment, which is essential for safety in HVAC applications involving gas heating systems. These devices utilize sensors that can detect gas concentrations at levels that are potentially hazardous, allowing for early warning and prevention of gas leaks, which can lead to dangerous situations such as explosions or carbon monoxide poisoning.

In contrast, a manometer is primarily used to measure gas pressure and would not be effective for just detecting gas leaks. A thermostat’s function is to regulate temperature and has no role in detecting gas leaks. Similarly, a blower motor is a component inside the HVAC system responsible for air circulation and does not monitor or indicate the presence of gas. Therefore, the gas detector is the appropriate tool for ensuring safety against gas leaks in HVAC systems.