608.5, Discharge Piping, subsection (7), is hereby deleted in its entirety and the following provisions shall be substituted therefor:

Discharge from a relief valve into a water heater pan shall be prohibited. Provided, however, relief valves on water heaters in multiple story residential units, each having an individual tank, may discharge into a water heater pan if the pan is provided with a full two (2) inch vented floor drain, is connected to the building drain and vent system, and provisions are made to ensure that the trap is properly primed. Water heater relief valves on water heaters installed over a crawl space may discharge into a water heater pan if the pan is provided with a full two (2) inch floor drain and that drain is extended to the exterior of the building. The relief valve may not discharge directly into the crawl space.