Condensation or water droplets appear on the outside of the heater.

Safety: Ensure no water is entering electrical compartments.

Steps:

• Differentiate condensation vs leak: Wipe the surface dry and observe. If moisture reappears uniformly, it is likely condensation; if localized, suspect a leak.
• Improve ventilation: Increase airflow in the room to reduce humidity.
• Check fittings: Inspect all pipe joints, especially at the top connections, for slow leaks. Tighten or reseal as needed.
• Protect electrics: Ensure covers are intact and gaskets are in place to keep moisture away from wiring.