Heater cabinet shows signs of corrosion, especially near the base and around plumbing connections.

Safety first: Turn off power before working around the heater. Wear gloves and eye protection when handling rusted metal.

Step-by-step checks:

• Improve drainage: Ensure the heater is installed on a solid, level pad with proper drainage. Divert gutter downspouts and sprinklers away from the unit.
• Relocate chemicals: Do not store chlorine, acid, or other pool chemicals near the heater. Their fumes accelerate corrosion.
• Repair leaks: Fix any slow drips at unions, valves, or the pump that may be wetting the heater base.
• Treat rust: Light surface rust on the Pahlen cabinet can be cleaned, primed, and painted with a corrosion-resistant coating. Structural corrosion of the frame or base pan may require panel or base replacement.

When to stop: If corrosion has compromised structural integrity or affected gas components, have a technician assess whether the heater is safe to operate.