A closed-loop system uses a heat-transfer fluid (water or diluted antifreeze, for example) to collect heat and a heat exchanger to transfer the heat to household water.
(A closed-loop system; uses; a heat-transfer fluid (water or diluted antifreeze; for example) to collect heat and a heat exchanger to transfer the heat to household water)
A closed-loop system
uses
a heat-transfer fluid (water or diluted antifreeze for example) to collect heat and a heat exchanger to transfer the heat to household water