NTI Brand Boilers Recalled Due to Fire and Carbon Monoxide (CO) Poisoning Hazards and Risk of Serious Injury or Death; Made by NTI Boilers

What was recalled

The U.S. Consumer Product Safety Commission (CPSC) has issued a significant safety alert regarding specific models of residential heating equipment manufactured by NTI Boilers. This recall focuses exclusively on the NTI Brand TRX Series II, which are wall-mounted gas boilers designed for home use. If you own one of these units, it is critical to verify whether your specific model falls within the affected range, as the safety issue is tied to precise manufacturing specifications rather than the entire product line.

The products at the center of this recall are gray in color and measure approximately 20 inches wide by 34 inches high. These dimensions help identify the physical footprint of the unit, which is typically installed against a wall in homes that rely on gas heating. The recall applies to three specific model numbers within the TRX Series II lineup: the TRX150, the TRX199, and the TRX199C. It is not enough to simply know that you have an NTI boiler; you must confirm that your unit carries one of these exact model designations.

To determine if your boiler is included in this recall, you need to locate the rating plate on the left-hand side of the unit. This plate contains the essential identification information, including the product name, model number, and serial number range. The recall affects units with the following model numbers and corresponding serial number ranges:

• Model TRX150 (Part Number 3314306C8): Serial numbers ranging from 242830000017 to 250130000073.
• Model TRX199 (Part Number 3314307C8): Serial numbers ranging from 242740000006 to 250220000014.
• Model TRX199C (Part Number 3314308C8): Serial numbers ranging from 242750000127 to 250410000051.

If your boiler’s rating plate shows a model number outside of these three options, or if the serial number falls outside the specified ranges for the models listed above, your unit is not part of this specific recall action. However, given the severity of the potential hazards associated with gas appliances, always prioritize verifying your exact serial number against these ranges.

These recalled boilers were sold at various retail locations and through online channels across the United States. The official recall announcement was made on June 5, 2025. While the specific date of purchase is not strictly required to establish eligibility for the remedy, knowing when you bought the unit can help you locate your receipt or warranty documentation if needed. If you are unsure where you purchased the boiler, check your home’s installation records or any maintenance logs provided by the original installer.

The key takeaway is that this recall is highly specific. It targets a particular set of manufacturing batches from NTI Boilers where a defect in the burner door studs could lead to improper sealing. By carefully checking your model and serial number against the data provided by the CPSC, you can quickly determine if your home heating system requires immediate attention. Do not rely on general descriptions; the serial number is the definitive identifier for inclusion in this safety action.

The hazard, explained

At the heart of this recall is a subtle but dangerous mechanical failure involving the physical seal of the boiler’s burner door. NTI Boilers has determined that certain units were manufactured with incorrect studs on these doors. In a properly functioning gas boiler, the burner door acts as a critical barrier, ensuring that the combustion process remains contained within the designated chamber. However, due to the specific defect in the recalled TRX Series II models, this door cannot close or seal tightly enough. This gap is not merely an inconvenience; it fundamentally alters how the appliance operates and creates two immediate, life-threatening risks.

First, the inability of the door to seal allows open flames to escape the combustion chamber. When a gas boiler ignites, it relies on precise airflow and containment to burn fuel efficiently and safely. If the seal is compromised by the faulty studs, these flames can leak out into the surrounding area of your home. This creates an immediate fire hazard, as the escaping heat and flame can ignite nearby combustible materials such as curtains, furniture, or cabinetry. While no incidents have been reported yet, the potential for a structure fire is significant because the source of ignition is internal to the unit and directly exposed to your living space.

The second and perhaps more insidious risk is the release of carbon monoxide (CO). Carbon monoxide is a colorless, odorless, and tasteless gas produced whenever fossil fuels are burned. In a correctly sealed boiler, this gas is typically vented safely outside through a flue. However, when the burner door fails to seal properly due to the incorrect studs, combustion gases—including carbon monoxide—can escape into the room rather than being directed outdoors. Because CO cannot be detected by human senses, exposure can occur without any warning signs until it is too late.

Inhalation of carbon monoxide disrupts the body’s ability to transport oxygen in the blood. Even low levels can cause headaches, dizziness, and nausea, while higher concentrations or prolonged exposure can lead to unconsciousness, organ damage, and death. This risk is particularly acute because boilers are often installed in basements, utility rooms, or garages—spaces that may not have adequate ventilation to disperse leaked gases quickly. The combination of a potential fire and silent, deadly gas leakage makes this defect especially perilous. It is crucial to understand that you cannot rely on the boiler’s normal operation to signal trouble; the defect is built into the hardware itself, meaning the unit may appear to be working normally while silently posing these severe hazards.

Who is most at risk

The primary group at immediate risk consists of homeowners and renters who have installed NTI Boilers in their living spaces, specifically those possessing the TRX Series II residential wall-mounted gas boilers with model numbers TRX150, TRX199, or TRX199C. Because these units are designed to be mounted on interior walls within a residence, they operate in close proximity to daily living areas rather than in isolated utility rooms or outdoors. This placement means that if the boiler door fails to seal properly due to the incorrect burner door studs, the resulting escape of flames and combustion gases occurs directly within the occupied environment. The risk is not theoretical; it is an active, physical hazard present in the very walls of the home where people sleep, work, and relax.

While the recall report states that no incidents have been reported to date, the nature of the defect creates a particularly dangerous scenario for vulnerable populations who may be less able to detect or react to early signs of trouble. Carbon monoxide (CO) is widely known as the "silent killer" because it is colorless, odorless, and tasteless. Individuals who are elderly, have pre-existing respiratory conditions such as asthma or COPD, or have cardiovascular issues are physiologically more susceptible to the effects of low-level CO exposure. For these groups, even small leaks that might go unnoticed by a healthy adult can lead to rapid deterioration in health, confusion, dizziness, or loss of consciousness before they realize something is wrong.

Children and infants also face heightened risks for several reasons. Their breathing rates are faster than those of adults, meaning they inhale more air relative to their body weight. If a boiler is leaking combustion gases, children will absorb a higher concentration of toxins per pound of body mass. Furthermore, young children may be physically unable to recognize the subtle signs of carbon monoxide poisoning, such as mild headaches or nausea, which are often mistaken for common illnesses like the flu. They rely entirely on caregivers to notice changes in their behavior or physical state and to take action to remove them from the environment.

Additionally, anyone sleeping in a room adjacent to or directly below where the boiler is mounted is at significant risk during the night. During sleep, human awareness of environmental changes is diminished. A slow leak that might trigger a CO alarm or cause noticeable symptoms while awake could progress silently through the night. The combination of impaired judgment due to gas exposure and the inability to quickly evacuate a home makes nighttime exposure particularly lethal. Therefore, any household member who spends extended periods in the immediate vicinity of the recalled unit, especially during sleep, is part of the high-risk demographic that must prioritize verification and remediation immediately.

How to tell if you have the recalled item

Because NTI Boilers are installed in utility rooms, basements, or mechanical closets, they are often out of sight and easy to overlook until a problem arises. However, identifying whether your unit is part of this specific recall requires a careful visual inspection and a close look at the technical data plate. The recall affects NTI-brand TRX Series II residential wall-mounted gas boilers. These units are distinctively gray in color and have a standard footprint that measures approximately 20 inches wide by 34 inches high. If your boiler is significantly larger, smaller, or a different color, it may not be part of this specific safety notice, but you should still verify the model number to be absolutely certain.

The most reliable way to confirm if your boiler is included is to locate the rating plate. This metal tag is affixed to the left-hand side of the boiler unit. You will need to find three specific pieces of information on this plate: the Model Name/Number, the Model Number, and the Serial Number. Do not rely solely on the general "TRX Series II" label, as that covers multiple variations. You must match your specific model number and serial number range against the affected lists below.

• Model TRX150: This model is identified by the part number 3314306C8. The affected serial numbers for this unit range from 242830000177 through 250130000073.
• Model TRX199: Identified by part number 3314307C8, the affected serial numbers for this unit range from 242740000006 through 250220000014.
• Model TRX199C: Identified by part number 3314308C8, the affected serial numbers for this unit range from 242750000127 through 250410000051.

If your boiler’s model and serial numbers fall within these ranges, it is part of the recall. It is important to note that the CPSC has not reported any incidents or injuries related to this defect yet, but the potential for fire and carbon monoxide poisoning remains a serious concern due to the burner door seal issue. If you cannot find the rating plate or if the numbers are illegible, do not attempt to remove panels yourself. Instead, contact NTI Boilers directly using the information provided in the remedy section to get assistance with identification. When you call or email, have your unit’s location and any visible labels ready to help the support team guide you through the verification process quickly and safely.

What to do — step by step

Your refund, repair, or replacement options

If you have identified that your NTI Boilers TRX Series II unit is part of this recall, the good news is that a clear and accessible remedy has been established by both the manufacturer and the Consumer Product Safety Commission (CPSC). Because the issue involves critical safety components—specifically the burner door studs that can cause the boiler door to fail sealing properly—the company has committed to correcting the defect at no cost to you. You are not required to purchase new parts or pay for labor to resolve this fire and carbon monoxide hazard. The primary goal of this remedy is to ensure your heating system is safe to operate again by replacing the incorrect studs with the proper ones that allow the door to seal correctly.

To initiate this process, you must contact NTI Boilers directly through one of their designated recall channels. They have set up specific resources to handle these inquiries efficiently. You can call their toll-free number at 800-688-2575. It is important to note the hours of operation for this support line: they are available from 7 a.m. to 8 p.m. Eastern Time, Monday through Friday. If you prefer written communication or need time to gather your serial and model numbers before speaking with an agent, you may also send an email to recall@ntiboilers.com. Alternatively, you can visit their website at http://www.ntiboilers.com/trx-safety-recall for detailed instructions. For those who find web navigation easier, you can go to www.ntiboilers.com and look for the "Urgent Recall" link located at the very top of the homepage.

When you reach out to NTI Boilers, be prepared to provide specific details about your unit to verify that it is indeed included in this recall. Ensure you have your model number (TRX150, TRX199, or TRX199C) and your serial number ready, as these are printed on the rating plate located on the left-hand side of the boiler. The company will use this information to confirm eligibility and likely arrange for the shipment of the correct burner door studs to your address. In most cases of this nature, the manufacturer handles the logistics of sending the replacement parts directly to the consumer, eliminating the need to visit a hardware store or service center.

Once you receive the correct studs, NTI Boilers will provide instructions on how to install them. Given that improper installation could still leave the unit unsafe, please follow their guidance meticulously. If you are not comfortable performing this repair yourself due to the electrical and gas connections involved in wall-mounted boilers, you may need to hire a qualified HVAC technician to perform the installation for you. However, the parts themselves should be provided free of charge by NTI Boilers as part of their recall remedy. Do not attempt to use the boiler until this repair has been completed and verified, as the risk of fire or carbon monoxide poisoning remains while the incorrect studs are in place.

What can happen if you ignore it

When a utility company or manufacturer issues a recall for a gas appliance, it is easy to feel like the inconvenience outweighs the risk, especially if the unit seems to be working fine on the surface. However, ignoring this specific NTI Boilers TRX Series II recall carries consequences that go far beyond a simple repair bill or a temporary loss of heat. The core issue lies in the mechanical integrity of the burner door. Because these units were manufactured with incorrect studs, the door cannot seal properly. This is not a minor cosmetic flaw; it is a critical failure point in the combustion chamber’s containment system.

The most immediate and severe danger is the uncontrolled escape of flames and hot gases. In a properly functioning boiler, all combustion byproducts are contained within the heat exchanger and safely vented through the flue to the outside air. With the door failing to seal, those high-temperature flames can breach the casing. This creates an immediate fire hazard for your home. The surrounding materials—walls, flooring, cabinetry, or insulation—are not designed to withstand direct exposure to open flames from a gas burner. A small leak of flame can quickly ignite nearby combustible materials, leading to a structure fire that spreads rapidly and is difficult to contain.

Equally dangerous is the risk of carbon monoxide (CO) poisoning. Carbon monoxide is an odorless, colorless, and tasteless gas produced by burning fuel. Under normal conditions, your boiler vents this gas safely outdoors. However, if the burner door does not seal, combustion gases can leak directly into the room where the boiler is installed. Because you cannot see or smell carbon monoxide, you may breathe it in without any warning signs until it is too late. Exposure to high levels of CO can cause headaches, dizziness, nausea, confusion, and loss of consciousness. In enclosed spaces like basements, closets, or mechanical rooms where boilers are often located, gas concentrations can build up to lethal levels very quickly.

The stakes here are life-threatening. The CPSC has explicitly stated that these hazards can result in serious injury or death. While there have been no reported incidents for this specific batch as of the recall date, the potential for tragedy is real and present every time the boiler operates. Continuing to use a unit with a known seal failure is essentially gambling with your home’s safety and the lives of everyone inside it. The risk is not hypothetical; it is engineered into the defect. Do not wait for a smoke detector to chirp or a headache to start before acting. The cost of ignoring this recall is potentially everything you have built in your home.

Staying safe: broader tips

While this specific recall addresses a manufacturing defect in NTI boilers, the underlying risks—carbon monoxide poisoning and fire—are universal challenges for any home with gas-fired heating equipment. Carbon monoxide is often called the "silent killer" because it is odorless, colorless, and tasteless. You cannot detect a dangerous leak by smell alone until it is too late. Therefore, the most critical step you can take for ongoing safety is installing carbon monoxide detectors on every level of your home, especially near sleeping areas. These devices should be treated with the same regularity as smoke alarms: test them monthly by pressing the test button and replace the batteries at least once a year, or when the device signals low power. If your detectors are hardwired, ensure they have battery backups. Never rely solely on your senses to determine if your air is safe to breathe.

Regular professional maintenance is equally vital for preventing hazards in gas appliances like boilers, furnaces, and water heaters. Even a perfectly manufactured unit can develop issues over time due to wear and tear, such as cracked heat exchangers or blocked venting pipes that allow exhaust gases to back up into your living space. It is highly recommended to have a qualified HVAC technician inspect your heating system annually before the cold season begins. During this inspection, ask the technician to check for proper combustion, ensure all gas connections are tight and leak-free, and verify that exhaust vents are clear of debris, snow, or nests that could obstruct airflow. Proper ventilation ensures that harmful byproducts of combustion are safely expelled outdoors rather than circulating indoors.

In addition to technical maintenance, simple behavioral habits can significantly reduce risk. Never use gas ovens or stovetops to heat your home, as these appliances are not designed for long-term continuous operation in a way that prevents carbon monoxide buildup. Ensure that the area around your boiler remains clear of flammable materials such as paper, clothing, or chemicals. If you ever suspect a gas leak—indicated by the smell of rotten eggs (which is added to natural gas for detection) or a hissing sound near a pipe—evacuate the home immediately and call your gas company or emergency services from a safe distance outside. Do not operate light switches, use phones, or create any sparks that could ignite the gas.

Finally, stay proactive about product safety by monitoring official recall databases. The U.S. Consumer Product Safety Commission (CPSC) maintains a public database of recalls that you can search by brand or product type. Consider signing up for email alerts from the CPSC so you are notified immediately if a product you own becomes subject to a recall. This proactive approach ensures that you are not caught off guard by safety issues and can take corrective action quickly, protecting your household from preventable harm.