Gas Appliances & Your Masonry Chimney
What you don’t know about your chimney can hurt you – especially if you have a gas-heating appliance that uses your masonry chimney as a venting system. Every day, without any visible signs, acid produced by your gas appliance may be eating away at the inside of your chimney.
The resulting damage can compromise the safety of your family and the value of your home. But thorough annual inspection of your chimney, as recommended by the National Fire Protection Association and the Chimney Safety Institute of America, can alert you to potential problems before they become costly or dangerous.
Most homeowners are aware of the need for chimney cleaning and inspection if they own a wood-burning stove or regularly use their fireplace. But many don’t realize that gas heating appliance – whether it is a furnace, boiler or even a hot water heater – relies on the chimney for proper venting of the exhaust.
Appliances fueled by natural gas or propane may not produce the visible soot that appliances burning other fuels do, but they can deposit corrosive substances in your chimney. In many cases, these acids may wreak havoc on your chimney without producing any external symptoms until the problem has become dangerous or expensive to repair.