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surface water loop
A type of horizontal, closed-loop geothermal heat pump system in which the fluid-filled plastic heat exchanger pipes are coiled into circles and submerged at least eight feet below the surface of a body of surface water, such as a pond or lake. The coils should only be placed in a water source that meets minimum volume, depth, and quality criteria.
Related category
• GEOTHERMAL ENERGY AND POWER
Source: US Department of Energy
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