An Innovation in Fire Safety Residential water heaters manufactured after 2003 are “F.V.I.R.” (Flammable Vapor Ignition Resistant) compliant. For the most part, this means that the combustion chamber is now sealed.

How does a flammable vapor sensor work?

FV Sensors are safety devices on select models of water heaters, which cause a soft lockout (a.k.a. the unit shuts down) when flammable vapors are detected near the unit, to prevent the possibility of their ignition.

What do all FVIR water tanks have in common?

All FVIR water heater tanks have things in common. 1) A flame arrestor plate. Located under the burner, the metal plate is designed to allow combustion air into the combustion chamber but keep flames from escaping downward and igniting flammable vapors below. 2) Thermal cutoff switch.

Are all new water heaters FVIR?

All water heaters now produced in North America are Flammable Vapor Ignition-Resistant (FVIR) types. The ANSI Standard was introduced in July 2003. Existing water heaters that did not meet the standard do not have to be replaced, but all new heaters do have this feature.

Do FVIR water heaters need to be elevated?

jolson8: Most gas water heaters in the 30-50 gallon range sold/manufactured in America since 2003 are FVIR (flammable Vapor Ignition Resistant) By 2005, all sold are FVIR. If a water heater is FVIR, it does not have to be elevated when installed in the garage.

How do you test a flame Vapour sensor?

Using a multimeter to check resistance, remove the sensor from its bracket on the base ring of the water heater and disconnect both wires to the sensor. 2. Take a resistance reading between the two wiring terminals of the FV sensor and note the resistance value.

Are Bradford White water heaters FVIR?

The Defender Safety System® is the name of Bradford White’s exclusive flammable vapor ignition resistant (FVIR) system. It is a proven feature in many of our residential gas water heaters that resists the ignition of flammable vapors outside of the water heater.

What is a TRP valve?

Temperature/pressure-relief or TPR valves are safety devices installed on water heating appliances, such as boilers and domestic water supply heaters. TPRs are designed to automatically release water in the event that pressure or temperature in the water tank exceeds safe levels.

How do I know if my water heater is FVIR?

How can I tell if my water heater is FVIR? Each manufacturer will have its own particular label for indicating if the model is FVIR.

What is a flammable vapor?

FLAMMABLE VAPORS ARE A SERIOUS SAFETY HAZARD! Vapors from flammable products—such as gasoline, kerosene, paint thinner, and solvents —can be ignited accidentally by the pilot light of a propane appliance. Sometimes the vapors may follow air currents in the building to higher levels. …

Article first time published on

Why do we need an expansion tank?

The expansion tank serves as a backup system to prevent overworking your plumbing. The excess water volume, instead of causing too much pressure on the plumbing, rushes into the expansion tank and lowers the pressure in the water heater to safer levels. This ultimately protects it from damage.

Does a water heater temperature valve need a discharge tube?

The Temperature & Pressure Relief Valve or TPR Valve on any heated appliance that contains water, such as a heating boiler, hot water tank, water heater, water cylinder, must have a drain line or discharge tube properly installed, routed, and made of proper materials.

What is the temperature of hot water?

The EPA recommends 120 degrees because it’s hot enough to keep diseases at bay, it’s not hot enough to cause scalding, it will supply enough hot water for most small families and is relatively energy-efficient. However, the best setting for you could vary based on a few factors.

Can water heater sit on garage floor?

Water heaters with FVIR technology may be installed on the floor of a residential garage. Electric water heaters do not have mandated FVIR technology and may cause a small spark when heating.

Why are hot water heaters raised?

The main reason you need to have your water heater placed on a hot water heater stands is to prevent fire incidents. Lifting your water heater prevents flammable fumes and vapors’ from spilled gasoline or any other combustible fluid from lying on the floor in the garage.

How much space do you need around a water heater?

Water heaters must be surrounded by a certain amount of clearance, or air space, to function properly and safely. A clearance area of 12 inches is required on all sides of a hot water heater. A certain amount of airflow is also required for proper combustion and ventilation.

Are Bradford White Water Heaters glass lined?

Bradford White created Vitraglas® and effectively set the standard for glass-lining protection. Since then, we’ve constantly improved both the chemistry and application of this exclusive formula to create the perfect tank lining. Today it’s included as standard equipment on nearly all Bradford White tank water heaters.

Why does my Rheem water heater keep shutting off?

The power vent water heater keeps shutting off If your power vent water heater keeps shutting off, the thermocouple could be damaged, dirty or bent. Inspect the thermocouple. If it is damaged, replace it. If dirty, let it down for cooling and then clean.

What does a blinking red light mean on a water heater?

Because there is air in the gas line, it may take up to 90 seconds before the red status light begins to blink. The red status light will blink once every 3 seconds when the water heater is operating normally.

How do you reset a flammable vapor sensor Rheem?

Turn the water heater’s gas valve switch to the “OFF” position, wait for a few seconds and then flip the switch to the “ON” position to reset the system.

What is a thermal release device?

Thermal Release Device- A small glass bubble or vial that is designed to cut off the fresh air entering the combustion chamber as during an extreme overheat situation.

Can a water heater explode?

If the heating element and/or thermostat were to malfunction, the temperature of the water inside the tank could increase to the point where it is producing steam. If the situation progresses, and there is no outlet for the steam, the increased pressure could cause the hot water tank to explode.

Why is water coming from the pressure relief valve?

When you see water coming out from the water heater release valve, there are two most likely causes. The relief valve is working the way it’s intended, and water drained to reduce the pressure inside the tank. There’s a problem with the valve, such as a faulty seal, and the water is unintentionally leaking.

Why is hot water tank relief valve leaking?

Your water heater’s relief valve can start leaking for one of two reasons: either the valve was triggered to open because of excessive temperature or pressure, or the valve itself is faulty. … If the problem is a faulty valve, then you might have an actual leak.

How do you handle flammable substances?

Eliminate ignition sources (sparks, smoking, flames, hot surfaces) when working with flammable and combustible liquids. Use the smallest amount of flammable liquid necessary in the work area. Keep storage areas cool and dry. Store flammable and combustible liquids away from incompatible materials (e.g., oxidizers).

What can ignite flammable Vapours?

Liquids (such as petrol and other fuels) and solvents in industrial products (such as paint, ink, adhesives and cleaning fluids) give off flammable vapour which, when mixed with air, can ignite or explode. The ease by which liquids give off flammable vapours is linked to a simple physical test called Flashpoint (ie.

Can sunlight ignite gasoline?

Gasoline/oil will not ignite or catch fire under direct sunlight nor will it if it came into contact with Styrofoam.

How do I know if my expansion tank is working?

The tank should be full of air and therefore sound hollow. If it makes a dull thud rather than a hollow sound, your tank is full of water and needs repair or replacement. You can also gauge this by feeling the tank, which will be cool where it’s holding air and warm where it’s holding water.

What happens when expansion tank fails?

Oftenthe diaphragm dividing the two systems will fail, causing the two systems to become one. When this happens, the expansion tank turns into a “dead leg” that will eventually cause damage and premature failure to your water heater.

Is an expansion tank required on a water heater?

While expansion tanks are required by code in most closed-loop water heater systems, they have a reputation for failing. Common expansion tank issues include: Rubber Diaphragm Wear Out.

How does a temperature relief valve work?

When a relief valve is dripping, it is typically due to thermal expansion. When water is heated, it expands. This causes excess pressure in the system. When the T&P relief valve senses this excess pressure, it opens relieving the thermal expansion* and returning the pressure back to normal conditions.