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