Flammable Vapor Ignition Resistance (FVIR) is a safety feature in gas water heaters that prevents ignition of flammable vapors from gasoline, solvents, or cleaners. FVIR designs use sealed combustion, flame arrestors, and controlled air intake to contain or extinguish vapors before they can ignite. Since the early 2000s, FVIR has been required on most residential gas water heaters.
/ˈflæməbəl ˈveɪpər ɪɡˈnɪʃən rɪˈzɪstəns (FVIR)/
Flammable Vapor Ignition Resistance (FVIR) is a safety feature in gas water heaters that prevents ignition of flammable vapors from gasoline, solvents, or cleaners. FVIR designs use sealed combustion, flame arrestors, and controlled air intake to contain or extinguish vapors before they can ignite. Since the early 2000s, FVIR has been required on most residential gas water heaters.
What does FVIR do on a gas water heater?
It prevents flammable vapors from igniting at the burner by controlling airflow and containing flames.
Source: The Cooling Company
FVIR protects against flammable vapor ignition.
In a garage installation, FVIR technology prevents a gasoline spill from igniting at the water heater, reducing fire risk.
Keep the air intake and flame arrestor clean, and never store flammable liquids near the water heater.
“Keep the air intake and flame arrestor clean, and never store flammable liquids near the water heater.”
FVIR standards were adopted after a series of flammable vapor ignition incidents in garages and basements.
Does FVIR eliminate all fire risk?
It greatly reduces ignition risk, but safe storage of flammables is still required.
Can FVIR components be cleaned?
Yes. A technician can clean the flame arrestor and intake to restore airflow.
Why did my FVIR water heater shut down?
A clogged arrestor or restricted intake can cause safety shutdowns.
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