Why is a secondary drain pan recommended for water heaters?

A secondary drain pan is recommended for water heaters primarily to catch leaks and prevent water damage. Water heaters can develop leaks over time due to corrosion, faulty connections, or other issues. If these leaks go unnoticed, they can lead to significant water damage in the surrounding area, such as flooring, walls, and personal property.

By installing a secondary drain pan underneath the water heater, any leakage that occurs can be collected within the pan and directed to a designated drain or outside. This proactive measure helps to prevent costly repairs and maintain the integrity of the premises, making it an essential safety feature for water heater installations.

The other options do not provide this specific function. Enhancing the efficiency of the heater, allowing for easier access, or providing insulation against heat loss are not the primary purposes of a secondary drain pan.