Which material is typically used in a water heater drain pan?

In water heater installations, a metal drain pan is typically used, and this choice is rooted in both safety and durability considerations. Metal pans can effectively contain any potential leaks or drips from the water heater, preventing water damage to the surrounding areas. They are resistant to rust and corrosion, especially if made from materials like stainless steel or galvanized steel, making them a long-lasting option.

In contrast, other materials such as wood would be unsuitable due to its susceptibility to rot and damage when exposed to moisture. Plastic, while lighter and potentially resistant to corrosion, may not provide the same structural integrity or heat resistance as metal. Concrete is not practical either, as it is cumbersome and does not serve the purpose of collecting water effectively when placed beneath a water heater. Thus, the use of metal for a water heater drain pan is the optimal choice for ensuring safety and longevity.