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