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On July 1, 2003, all residential gas water heater manufacturers introduced 30, 40 and 50-gallon atmospheric models with "Flammable Vapor Ignition Resistant" designs. As the inventory of the existing “old” style water heaters are depleted, these new style water heaters will take their place. Other styles (power vented, other gas fired models) will come on line in 2004 and into 2005

Every manufacturer's design must meet standards and protocols established by the American National Standards Institute (ANS Z21.10.1). And, while all manufacturers' designs are unique in some respects, all incorporate the following features:

A Flame Arrestor, located beneath the burner, designed to permit combustion air to flow up through it to sustain combustion, but to prevent flames from escaping downward through it in the event of flammable vapor ignition.

A Thermal Cutoff Switch (TCO), designed to shut the unit down when it senses excessive temperatures caused by inadequate combustion air inside the combustion chamber.

There are several FACTS inherent in the Industry's testing protocols for Flammable Vapor Ignition Resistant Certification that you must keep in mind:

FACTS

All designs use Flame Arrestor technology to prevent a back-flow or back draft of ignited vapors.
All flame arrestors are susceptible to lint, dust or oil (LDO) accumulation in harsh environments.
All water heaters must shut down before exceeding Carbon Monoxide (CO) limits to pass LDO testing.
All designs have a temperature sensor to shut down the water heater. An abnormal situation, creating a "shut down" condition, can be caused by the accumulation of LDO, ignition of flammable vapors, inadequate make-up air for combustion, or inadequate exhaust venting. These conditions (except for ignition of flammable vapors) can cause the burner flame to flatten out and increase the internal temperature of the water heaters' combustion chamber.

We recommend these Flammable Vapor Ignition Resistant Water Heaters be serviced Annually. This can be done in conjunction with the service of your furnace or boiler.



,	Plumbing Heating & Air	Facts about Gas Water Heaters with “Flammable Vapor Ignition Resistant” Technology On July 1, 2003, all residential gas water heater manufacturers introduced 30, 40 and 50-gallon atmospheric models with "Flammable Vapor Ignition Resistant" designs. As the inventory of the existing “old” style water heaters are depleted, these new style water heaters will take their place. Other styles (power vented, other gas fired models) will come on line in 2004 and into 2005 Every manufacturer's design must meet standards and protocols established by the American National Standards Institute (ANS Z21.10.1). And, while all manufacturers' designs are unique in some respects, all incorporate the following features: A Flame Arrestor, located beneath the burner, designed to permit combustion air to flow up through it to sustain combustion, but to prevent flames from escaping downward through it in the event of flammable vapor ignition. A Thermal Cutoff Switch (TCO), designed to shut the unit down when it senses excessive temperatures caused by inadequate combustion air inside the combustion chamber. There are several FACTS inherent in the Industry's testing protocols for Flammable Vapor Ignition Resistant Certification that you must keep in mind: FACTS All designs use Flame Arrestor technology to prevent a back-flow or back draft of ignited vapors. All flame arrestors are susceptible to lint, dust or oil (LDO) accumulation in harsh environments. All water heaters must shut down before exceeding Carbon Monoxide (CO) limits to pass LDO testing. All designs have a temperature sensor to shut down the water heater. An abnormal situation, creating a "shut down" condition, can be caused by the accumulation of LDO, ignition of flammable vapors, inadequate make-up air for combustion, or inadequate exhaust venting. These conditions (except for ignition of flammable vapors) can cause the burner flame to flatten out and increase the internal temperature of the water heaters' combustion chamber. We recommend these Flammable Vapor Ignition Resistant Water Heaters be serviced Annually. This can be done in conjunction with the service of your furnace or boiler.