Where should radiant floor heating not be installed?

• A. Under stairs
• B. Under countertops
• C. Under pantry and cabinets
• D. Under refrigerators

Answer: (C)

Radiant floor heating warms the living space by transferring heat upward through the floor surface, so the heated area should remain unobstructed to allow even heat distribution. Placing the radiant system under pantry or cabinet bases places a solid, heat-absorbing mass directly on top of the heated layer. Wood and MDF cabinet materials, finishes, and adhesives aren’t designed for sustained warmth, so they can warp, delaminate, or discolor if heated continually. The cabinetry also blocks the heat from entering the room, reducing efficiency and creating hotspots beneath the fixtures. Because of these issues, areas under pantry and cabinets are avoided for radiant floor heating installations.