A water system 15 selected from {HEAD ~ the group} consisting of {TAIL ~ geothermal water}, water in central heating systems, and water for hydrostatic tests 
consisting of
A water system 15 selected from { HEAD ~ the group } consisting of { TAIL ~ geothermal water } , water in central heating systems , and water for hydrostatic tests
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH