Patent ID: 7841042

Claim:
A heat exchange device for heating at least one fluid to an elevated temperature for use during cleaning, comprising: at least one heat exchange chamber having a fluid inlet, a fluid outlet, and an exhaust passage, wherein the at least one heat exchange chamber comprises a first heat exchange chamber and a second heat exchange chamber, wherein the first heat exchange chamber comprises a first fluid inlet, a first fluid outlet, and a first exhaust passage, wherein the second heat exchange chamber comprises a second fluid inlet, a second fluid outlet, and a second exhaust passage, and wherein the exhaust flow control mechanism differentially diverts the exhaust flow between the first exhaust passage and the exhaust bypass at a first ratio and differentially diverts the exhaust flow between the second exhaust passage and the exhaust bypass at a second ratio; an exhaust bypass; and an exhaust flow control mechanism for differentially diverting an exhaust flow between the exhaust passage and the exhaust bypass.