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SBN71-120 thru 85-390, SBD30-150/199 TANK TYPE COMMERCIAL
GAS WATER HEATER SERVICE HANDBOOK
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Along with adequate make-up air, the quality of the air is important. Contaminants in
combustion air can lead to premature heater failure. Vapors from bleaches, soaps, waxes,
salts, etc. are drawn into the combustion chamber with the make-up air and, once fired, mix
with water vapor in the gases to form extremely corrosive hydrochloric or hydrofluoric acid
and other corrosive by-products.
CONTAMINATED AIR
AIR FOR COMBUSTION – FLAMMABLE ITEMS