The tube in said exchanger is preferably provided by the conduit loop and has {HEAD ~ a surrounding shell} of sufficient strength to withstand {TAIL ~ the pressure} of the second fluid, which in most cases, will be tap water 
The tube in said exchanger is preferably provided by the conduit loop and has { HEAD ~ a surrounding shell } of sufficient strength to withstand { TAIL ~ the pressure } of the second fluid , which in most cases , will be tap water
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH