Abstract: A U-bend pipe spacer for separating vertical portions of a U-bend pipe in a bore in the ground during installation of the U-bend pipe in a geothermal vertical heat exchanger system. The U-bend pipe spacer includes a biasing member with a pair of elongate portions having free ends biased apart from one another. The elongate portions of the biasing member is resiliently deflectable from a relaxed position to a deflected portion such that the free ends of the elongate portions of the biasing member are positioned closer to each other when the elongate portions are in the deflected position. The spacer also includes a pair of clip members each comprising a body having a concave arcuate side face defining a channel and a tremie hook is coupled to the body. The tremie hook has a concave side.