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If the waste backs up into and deteriorates the combustion chamber or the flue gas chimney, the results can dramatically reduce the life of the heat exchanger. "All gas-fired boilers, water heaters and furnaces experience wetted acidic condensation during a cold-start, but properly installed systems dry out so quickly that the acidic condensate evaporates harmlessly," Yates adds. [...]a 200 MBH water heater, on average, produces eight 55-gallon drums of acidic waste each year," says Jim Simas. [...]we're reminded of the need for annual maintenance, most often included as part of pre-season service.