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RESIDENTIAL GAS, NON POWER VENTED, WATER HEATER
SERVICE HANDBOOK
State Water Heater Technical Training Department
© 2004 Ashland city, TN
17
FLAME ARRESTOR
Made from Corderite, a fireproof ceramic material, the flame arrestor is built into the base of
the water heater. Combustion air is drawn in through the LDO screen (s). After entering the
bottom area of the water heater, this air passes up through the small ports of the flame
arrestor and into the combustion chamber.
In the event flammable vapors are introduced accidentally into the combustion chamber, the
flame arrestor is designed so any flames burn off the top surface of the arrestor and cannot
escape down through the arrestor. The arrestor works somewhat like a check valve.
Service:
Inspect the bottom ports of the flame arrestor by removing the LDO screen (s) and using
a mirror and flashlight. Clean the ports if necessary by vacuuming the bottom of the
arrestor.
Inspect the top of the flame arrestor by removing the inner door and burner assembly.
Lift the heat shield located on the bottom of the chamber. Inspect with the mirror and
flashlight. Vacuum or blow down any blocking material. If you blow down through the
ports, be certain to also vacuum below the arrestor.