Closed Loop Solar Hot Water Heating
Closed-Loop Active Systems pump heat-transfer fluids such as glycol-water antifreeze through the solar water heater to a heat exchanger. Another Heat exchanger transfers the heat from the transfer-fluid to the potable water.
Closed-loop glycol systems are popular in areas subject to extended subzero temperatures because they offer protection against freezing. Glycol-water based systems have a poorer heat transfer co-efficient than of water to water. Glycol-water based systems, like your car's antifreeze the systems must be checked periodically and the glycol must be replaced when it comes to end-of life.
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Ontario,Muskoka and Georgian Bay
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Caribbean and US