NATE Gas Heating Practice Exam

The three basic categories of ignition systems are indeed continuous ignition, intermittent ignition, and direct ignition.

Continuous ignition systems are designed to maintain a constant flame, which allows for immediate operation when called upon. This type of system is often found in applications where a steady supply of heat is necessary, such as in some residential boilers.

Intermittent ignition refers to systems that generate a spark only when the appliance is calling for heat, leading to more efficient fuel use since the flame only operates when needed. This type can help reduce wear and tear on components and improve overall system efficiency.

Direct ignition systems involve the ignition of gas directly by using a high-voltage spark or other means, allowing for a quick and reliable ignition process. This provides a fast response to demand for heat and often contributes to efficiency by minimizing delays in ignition.

The other options reference categories that are either too broad or include terminologies that do not accurately reflect standard ignition system classifications. Understanding these distinctions helps in troubleshooting and optimizing heating system performance.