This varies from house to house. The larger the house is in size the
more loops that are needed. When installing a loop, trenches need to
be 100-110 feet in length, 6-7 feet deep and spaced at least 15 feet
apart. Also a “header” trench is dug which runs perpendicular to the
loop trenches. The header trench runs from the house to the end of
the last loop ditch. At a point in the header trench all of the loop
tubing is fused to the header pipes. The header pipes run into the
house and eventually are attached to a flow center. An example
installation in a house of 1500 square feet would require a 4-ton loop.
When referring to tonnage in a loop it means that 4 trenches would be
needed in this example.