A gas valve with 100% shut-off ensures which of the following?

A gas valve with 100% shut-off ensures that gas to both the pilot and the manifold is completely shut off when the valve is in the closed position. This feature is crucial for safety in gas heating systems, as it prevents the escape of gas when the system is not in operation. By eliminating the potential for gas leaks, a valve with this capability provides a high level of safety and helps maintain system integrity when the burner is not in use.

Additionally, the design of such a valve is aimed to ensure that there is no gas present in the combustion area, which is essential for preventing accidents and ensuring safe operation. Therefore, having a valve that guarantees 100% shut-off capability is essential for both safety and reliable operation in HVAC systems that utilize gas heating.