Lake, pond, closed-loop heat pumps are great options for homeowners who live close to water source. A water body is a potential source of heat, as well as a heat rejection sink. However there are a few criteria that should be met before installing geothermal closed-loop water source heat pump. Read on to know them:

• The depth of the water body where you want to submerge the loop should beat least 8 ft. deep. The water coupling, pipe coils are immersed at this level as the water do not freeze here in winter.
• The loop should not be placed in water source which has moving water. In other words avoid water body that is subject to flooding or has extremely high current. Flood stages may destroy the loop.
• The loops should contain anti-freeze solution by 20 %.
• The water source should be closed to the house. If it is too far, say, the pipes have to cross a big moor on the way, the effect will be little.
• Parallel configuration is generally followed in installations. The supply header of the system is at one side and the return header is at the other end. The loop is at the middle.

• Plastic pipes are buoyant in nature. Even when they are filled they can come up. Therefore take enough care so that they are anchored in place.
• The coils of pipes are usually connected together on skids and pulled into the water. The heat transfer coil is usually designed on a skid and also sunk into the water.
• Before inserting the loops in the water they should be assembled and checked for leaks and appropriate pressure on the land.
• The assembly loop should be filled with air and not water and floated in water with weight attached. When it reaches the proper location, it should be sunk into the pond by filing the loops with water.

• The service lines that will carry the heat from the water should be buried and concealed from the shore to the junction where it meets the heat pump. They may be secured to docks or piers at or near the bottom.
• Along with plastic pipes copper, polyethylene or poly brittleness pipe coils are also used. But on an average you will need at least 150 feet copper loop and 300 feet plastic pipe per cooling ton of installed heat pump capacity.
• No matter how the coils are installed horizontally or vertically, there should be provision to keep them slightly, above the bottom.