These and other objects of the present invention are achieved by providing a gas fired tube and shell heat exchanger in which a gas fired burner projects its flame directly into {HEAD ~ the inlet end} of a tube bundle and {TAIL ~ the heat} from the flame flows directly through the tube bundle 
These and other objects of the present invention are achieved by providing a gas fired tube and shell heat exchanger in which a gas fired burner projects its flame directly into { HEAD ~ the inlet end } of a tube bundle and { TAIL ~ the heat } from the flame flows directly through the tube bundle
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 OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH