Weil-McLain water heater’s vent pipe shows signs of corrosion, white residue, or water dripping from joints.

Safety first: Turn off power and gas. Corroded vents can leak flue gases, including carbon monoxide.

• Inspect vent material: Verify that vent piping matches Weil-McLain specifications (PVC, CPVC, stainless, or B-vent as required). Replace incompatible materials.
• Check slope: Ensure vent is sloped correctly toward the appliance or drain, per installation manual, to prevent condensate pooling.
• Inspect condensate drain: Confirm that condensate from the vent or heat exchanger is properly trapped and drained.
• Replace damaged sections: Any corroded or perforated vent sections must be replaced immediately by a qualified technician.