Solar Hot Water Fact Sheet

the solar water heater installation. For this reason it is important to make the existing hot water … flow restrictors in the shower and faucets, insulating the … Collectors. Heat Exchanger. To. Household. Pump. Basic System Diagram.

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A solar domestic hot water system uses the sun to heat water for home use. A solar hot water system connects to a home\’s existing gas or electric water heating system, providing a supplemental source of heat for all hot water needs including showers, dishwashing, clothes washing, and cooking. Solar water heating systems are a proven technology that work well even in cold climates. A solar hot water system can provide 40 -70 percent of a household\’s annual hot water needs. The most common type of solar domestic hot water system installed in colder climates is a closed loop active system. Closed loop systems have a set amount of fluid (usually antifreeze) traveling through the heating system. They are called \”active\” systems because they rely on circulating pumps to move the fluid through the system. This fact sheet focuses primarily on this type of system.
Heat Transfer Fluids Various liquids can be used as heat transfer fluids in a solar water heater. They include tap water, distilled water, inhibited propylene glycol, alcohol, and various oils. In general, water is only used in warm climates where freezing is unlikely. Inhibited propylene glycol (an antifreeze) is a popular heat transfer fluid in cold climate installations because it is nontoxic and very stable. This is an important consideration in closed loop systems where the same fluid continues to circulate through the system until it needs to be replaced (usually in 3 10 years). Circulating Pumps A small (1/40 – 1/20 hp) circulating pump is needed to move the heat transfer fluid through the system. These pumps can be powered by either DC (direct current) or AC (alternating current) electricity.

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