The ProLine® 120-gallon direct solar booster water heaters are designed for installation as a part of a direct (open loop) solar water heating system or for use with external heat exchangers in closed loop systems. The SUN-120 provides storage for the hot water produced by the solar collectors and a supplementary electric heating element that maintains consistent water temperature during periods when solar energy is not available. Count on A. O. Smith for innovative products that provide hot water solutions for residential renewable energy applications.

Environmentally-friendly insulation and factory-installed heat trap nipples reduce heat loss for maximum energy savings.

A. O. Smith’s ProLine® water heaters are residential products built to commercial-grade standards and are only available for purchase through professional wholesalers and contractors.