What condition is often caused by high humidity in the space where a gas appliance is located?

High humidity can create an environment conducive to corrosion, particularly in metal components such as gas lines and other associated fittings within a gas appliance system. When humidity levels are elevated, moisture in the air can condense on the surfaces of these components, leading to rust and corrosion over time. This deterioration can compromise the structural integrity of gas lines and fittings, potentially leading to leaks and operational issues.

In contrast, while conditions like gas leaks from connectors or incomplete combustion may occur due to various factors (including wear and maintenance issues), they are not directly tied to the effects of high humidity as corrosion is. Increased efficiency of appliances is also not typically associated with high humidity; rather, that can be affected by proper maintenance and environmental conditions conducive to combustion rather than the moisture level alone.