Solaraide Passive Solar Water HeaterFrom Rheem

Rheem

Utilizing convection, the Solaraide passive solar water heater operates without pumps or controllers. The units can be used alone or to supplement conventional hot-water systems by pre-warming the water. Solaraide's freeze-proof heat-transfer fluid absorbs and delivers heat energy, even on cold and overcast days, says the firm; the closed-loop setup also prevents freezing. A 47-gallon model and an 80-gallon model are available. Cost: 47-gallon, $3,800; 80-gallon, $4,900. 800-621-5622. www.rheem.com.

• Solar Solution Brochure
• Passive Solaraide Spec Sheet
• Passive Solar Systems Use and Care Manual