The average lifespan of a gas furnace is 15 to 25 years. However, lifespan depends on a number of factors, including when the furnace was built, the materials it is made out of and maintenance.Know More
Older gas furnaces tend to last longer because they have very simple designs and are made out of heavier metals. However, these furnaces are often far less efficient than modern models, and they lose efficiency as they age and their parts degrade.
The materials used in gas furnaces also play a role in life span. Heavier materials tend to break down more slowly than lighter ones, which makes them last longer. However, heavy steel and iron parts are not always as efficient as lighter materials. For example, modern condensing furnaces have plastic pipes, which tend to break down faster than metalbut metal pipes are less efficient as they absorb heat.
Maintenance is a major factor in furnace lifespan. Homeowners can boost lifespan by:
Homeowners should replace furnaces that do not distribute heat evenly throughout the home, that break down frequently, that make a lot of noise or that do not work efficiently.Learn more about Heating & Cooling
To vent a gas furnace, decide on what type of venting to use, measure the distance of venting needed, purchase metal vent piping and attach the venting from the furnace to the chimney. Proper venting of a gas furnace removes harmful toxins from the air, and should only be done by persons with the expertise, tools, materials and equipment to properly perform the installation.Full Answer >
Reasons that a gas furnace leaks water can include a leak in the air conditioning evaporator or a leak in the humidifier. Water can leak in and around a high-efficiency furnace if the condensate drain tubes are disconnected or clogged.Full Answer >
To troubleshoot gas furnace burners that do not ignite, inspect the pilot light, ensure the gas valve is on and perform other common troubleshooting tasks. Review the owner's manual for model-specific troubleshooting instructions.Full Answer >
According to HowStuffWorks, the thermocouple in a gas furnace uses two dissimilar metals that produce an electric current when heated in order to power an electromagnet that opens a valve allowing gas to reach the furnace. If the pilot light goes out, the thermocouple cools and no longer produces the current, so the electromagnet releases the valve to stop the gas flow.Full Answer >