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