When a drain pan is utilized for a water heater, how far above the adjacent ground surface must it terminate?

The requirement for a drain pan used with a water heater to terminate 6 inches above the adjacent ground surface is rooted in safety and functionality standards. This elevation helps ensure that any water collected in the drain pan is efficiently directed away from the water heater and prevents potential flooding or damage to the surrounding area.

By positioning the drain pan 6 inches above ground level, it reduces the risk of debris accumulation around the pan that could block drainage, ensuring that any overflow or leaks from the water heater can be effectively channeled away. Additionally, this height helps to prevent pests or other environmental factors from interfering with the drainage system.

In many plumbing codes and best practices, this specific height is commonly adopted to provide a balance between functional drainage and practical considerations in maintenance and installation.