A vertical loop is used mainly when land area is limited. A drilling rig is used to bore holes at of depth of 150 to 300 feet per ton. A U-shaped coil of high density pipe is inserted into the bore hole. The holes are then back filled with a sealing solution.
Horizontal loops are commonly used when adequate land area is available. Loop installers use equipment such as directional boring machines to install the loop between 15 and 20 feet deep, other horizontal loops can be dug in using backhoes and track hoes & chain trenchers to dig trenches approximately 6-8 feet deep. Horizontal loop lengths range from 100 to 300 feet per ton, depending on the loop design and application.
A pond loop is an option if a large body of water is available within approximately 200 feet of the home. A ½ acre, 10 to 12 foot deep body of water is usually adequate to support the “average” home. The system uses coils of pipe typically 300 to 500 feet in length. The coils are placed in and anchored at the bottom of the body of water.
Open loop systems can be installed if an abundant supply of high quality well water is available. A typical home will require 4 to 8 gallons of water per minute. A proper discharge area such as a river, drainage ditch, stream, pond, or lake must be present. Check for local restrictions before selecting a specific discharge method.