Boiler runs but produces visible white steam or excessive condensation at vent termination

Safety: Visible vapor is often normal for condensing boilers, but pooling condensate can damage structures.

• Check vent slope: Ensure horizontal vent sections are sloped per NTI instructions to drain condensate back to the boiler or to an approved drain.
• Inspect termination: Confirm the vent outlet is located per code clearances from windows, doors, and walkways.
• Monitor for leaks: Look for condensate dripping from joints; reseal or replace fittings as needed.