Rheem. Solaraide passive solar water heating systems operate without pumps or controllers, instead relying on convection to circulate a freezeproof heat-transfer fluid in a closed-loop environment. The product combines a storage tank with one or two collector panels and comes in 47- or 80-gallon systems. Both models are Solar Rating and Certification Corp.-certified. 800.621.5622. www.rheem.com.
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