Where should the condensate line of a condensing furnace terminate?

The correct choice is that the condensate line of a condensing furnace should terminate to an open floor drain. This is because the condensate produced by condensing furnaces is typically acidic and should be discharged away safely to prevent any potential damage to the building structure or groundwater.

Using an open floor drain provides a safe and effective means of disposal, ensuring the condensate can flow freely without the risk of backing up or causing blockages. The floor drain is designed to handle such wastewater, including the acidic nature of the condensate, which minimizes corrosion risks and maintains the integrity of the drainage system.

Other termination options may lead to complications. For instance, terminating the line on the floor near the drain may not ensure proper drainage or could risk water damage if pooling occurs. Directing the line outside the building may expose it to freezing temperatures and other environmental factors, potentially causing the line to become clogged or damaged. Similarly, running the line through the concrete floor may complicate maintenance or pose issues if a repair is needed, as accessing the line would require breaking through the concrete.