What does a radiant system utilize for heating?

A radiant system utilizes a panel or fin tube system for heating by delivering warmth through surfaces rather than through the air. This approach relies on the principle of thermal radiation, where heat is emitted from warm surfaces, such as floors or walls, and radiates to objects and occupants in the space, creating a comfortable environment.

Panels, often located in floors, walls, or ceilings, are heated by circulating warm water or through electrical elements. Another common form within radiant systems is fin tube radiators, which increase the surface area for heat distribution, allowing for more efficient warmth delivery. This method provides consistent and comfortable heating throughout the space, enhancing energy efficiency compared to other methods that rely on moving air.

In contrast, the other options focus on different heating systems: a fan and duct system utilizes forced air to distribute heat; an electric resistance coil generates heat through electrical currents; and a geothermal pump draws heat from the ground. These alternatives do not embody the same radiant heating principles that emphasize surface warmth and radiation transfer.