If a water heater is installed above a drop ceiling, what must be placed beneath it?

When a water heater is installed above a drop ceiling, it is essential to place a water-tight pan made of corrosion-resistant material beneath it. This requirement is in place to prevent potential water damage in the event of a leak or failure of the water heater. The pan serves as a containment system, catching any water that may escape and directing it to a drain if one is available. This protective measure is crucial for maintaining the integrity of the building structure and minimizing the risk of water-related damage, particularly in areas where ceilings and electrical systems are present.

The importance of using a corrosion-resistant material lies in its durability and ability to withstand prolonged exposure to moisture. This ensures that the pan will last over time without deteriorating or failing, which is vital for the overall effectiveness of the safety measure.

In contrast, while a wooden support, insulation, or a drainage system might be relevant in other contexts of plumbing or building safety, they do not directly fulfill the specific requirement for preventing water damage when a water heater is installed above a drop ceiling. Thus, the water-tight pan is the most appropriate and necessary component in this scenario.