A: Poor water quality can cause serious problems in open loop systems. Your water should be tested for hardness, acidity and iron content before a heat pump is installed. Your contractor or equipment manufacturer cant ell you what quality of water is acceptable. Mineral deposits can build up inside the heat pump’s exchanger. Sometimes a periodic cleaning with a mild acid solution is all that’s needed to remove the build-up. Where well water does not meet the requirements for an open loop geothermal system, a closed loop would be used.
Adopted from the Geothermal Journal
Used by permission – Water Furnace International Inc.