In still another form of {HEAD ~ the invention}, the heat exchanger forms an essentially closed reservoir so that the exhaust pipe does not come in {TAIL ~ contact} with the fluid flowing therethrough 
In still another form of { HEAD ~ the invention } , the heat exchanger forms an essentially closed reservoir so that the exhaust pipe does not come in { TAIL ~ contact } with the fluid flowing therethrough
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 OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH