Gas Heat ESCO Practice Exam 2026 – Comprehensive All-in-One Guide for Exam Success!

A gas valve with 100% shut-off means that both the gas to the pilot and the gas to the manifold are completely shut off. This ensures that no gas is flowing through either the pilot or the manifold, making it a safe and effective way to stop the flow of gas in a system. This level of shut-off is essential in case of emergencies or when the gas supply needs to be stopped completely. Therefore, option C is the correct choice. Option A is incorrect because having full flow to the pilot and manifold does not indicate a shut-off. Option B is incorrect as it suggests the gas to the manifold is at full flow, which contradicts the concept of shut-off. Option D is incorrect because having the manifold at full flow and the gas to the pilot at low flow does not indicate a complete shut-off of the gas flow.