Condensation or water droplets appear around the vent or top of a Marey gas tankless heater.

Safety first: Turn OFF the heater if you suspect vent leakage of flue gases.

Steps:

• Inspect vent slope: Ensure horizontal vent sections slope correctly per Marey instructions (usually back toward the heater or toward a drain, depending on design).
• Check joints: Verify all vent joints are properly sealed and locked. Reseal with approved vent sealant if needed.
• Insulate vent: In cold spaces, insulate vent sections to reduce condensation.
• Install or clear condensate drain: If your model requires a condensate drain, ensure it is installed and not blocked.

When to call a technician: For vent system modifications or if you suspect flue gas leakage.