Wall Mounted Tankless Water Heater Drain Pan - 20 x 13 x 2.5 | Galvanized - Killarney Metals - This galvanized drain pan is designed to be wall mounted under a tankless water heater to catch leaks. This pan will cover the footprint of the heater and its piping so that your floors are clear of water damage. Protect your home with the Wall Mounted Tankless Water Heater Drain Pan. Wall Mounted Tankless Water Heater Drain Pan - 20 x 13 x 2.5 | Galvanized - Killarney Metals, Killarney Metals