Which type of water supply is not recommended for heat loops encased in a floor?

• A. Municipal water
• B. Solar panels
• C. Well water
• D. Hard water

Answer: (B)

Radiant floor loops rely on a stable, conditioned heat transfer fluid circulating in a closed circuit. The fluid is chosen and treated to minimize corrosion, scale, and freezing, and it’s supplied from a dedicated water/fluids loop rather than from a source like a solar panel. Solar panels are part of a solar thermal system that heats water in a separate circuit; they are not a direct water supply for the embedded floor loop. Municipal water, well water, and hard water are real water sources that can feed the loop when properly treated or conditioned to prevent scale and corrosion. So the option that isn’t a water supply for the floor loop is the solar panel system.