Rinnai America Recalls Boilers Due to Carbon Monoxide (CO) Poisoning Hazard

What was recalled

The Consumer Product Safety Commission (CPSC) has issued a significant safety recall involving specific residential heating equipment manufactured by Rinnai America. This action, announced on June 5, 2025, targets a particular line of high-efficiency gas boilers designed for home use. If you rely on this type of wall-mounted unit to heat your living spaces, it is crucial to verify whether your specific model is part of this batch. The recall focuses exclusively on Rinnai-brand i-Series Plus residential wall-mounted gas boilers. These are not portable space heaters or standard water heaters; they are substantial, permanent heating systems installed directly onto the interior walls of homes.

The specific models included in this recall are identified by four distinct model numbers: IP175S, IP199S, IP175199C, and IP199199C. To confirm if your unit is affected, you must look for the top white label located on the side of the boiler. This label contains several critical pieces of information that serve as your primary verification tools. First, it will state "MADE IN JAPAN." Second, it will list one of the four model numbers mentioned above. Following the model number, there will be a reference code enclosed in parentheses. The label also clearly identifies the fuel type as "NATURAL GAS" and provides the serial number, which is a combination of letters and numbers.

Visually, these recalled boilers are rectangular and constructed from metal. They feature a sleek design with the brand name "Rinnai" printed in black near the top of the unit. At the bottom front of the boiler, you will find a digital temperature display and keypad used for operating the system. If your heating unit matches this physical description and bears one of the specific model numbers on its side label, it is subject to this recall.

While the official recall notice does not specify the exact number of units sold or the precise geographic regions where they were distributed, these products are generally available through professional HVAC contractors and authorized dealers across the United States. Because these are specialized residential heating systems, they are typically installed in homes rather than purchased off-the-shelf at retail stores. If you are unsure when your unit was installed or who installed it, checking your maintenance records or contacting your original installer may help confirm the model number if the label is obscured.

The scope of this recall is limited to the i-Series Plus line with the specific model identifiers listed above. Other Rinnai models not bearing these exact numbers are not included in this particular safety action. However, given the severity of the carbon monoxide hazard involved, immediate verification is strongly advised for anyone owning a wall-mounted gas boiler from this manufacturer during this period.

The hazard, explained

At the heart of this recall is a subtle but dangerous mechanical failure involving the physical seal of your Rinnai boiler’s door. These wall-mounted gas boilers are designed to burn natural gas in a controlled environment, generating heat for your home. Under normal conditions, the combustion process happens inside a sealed chamber, and the resulting exhaust gases—including carbon monoxide—are safely vented out through your home’s flue system. However, in the recalled units, the door that provides access to this internal mechanism is held in place by incorrect screws. Because these fasteners do not provide the necessary tension or alignment, the door can fail to seal properly.

This seemingly minor assembly error creates a critical gap between the boiler’s internal combustion chamber and the air inside your living space. When the boiler is running, it produces carbon monoxide (CO), an odorless, colorless gas that is produced whenever fuel is burned incompletely or when exhaust pathways are compromised. With the door not sealing tightly, these toxic gases can leak directly into the room where the unit is installed rather than being directed entirely out of the house. This bypasses the primary safety barrier intended to keep household air safe.

Carbon monoxide is particularly insidious because it interferes with your body’s ability to carry oxygen in the blood. When inhaled, CO binds to hemoglobin much more strongly than oxygen does, effectively suffocating cells from the inside out. In high concentrations or with prolonged exposure, this can lead to severe health consequences, including headaches, dizziness, confusion, nausea, and in worst-case scenarios, unconsciousness or death. Because you cannot see, smell, or taste the gas escaping from the improperly sealed door, you might be exposed for hours before realizing there is a problem.

The risk is compounded by the fact that these boilers are often installed in utility rooms, basements, or garages—spaces that may have limited ventilation. If the CO leaks into the general atmosphere of your home, it can accumulate to dangerous levels while you sleep or go about your daily routine. The CPSC highlights this specific failure mode because the incorrect screws create a direct pathway for poison gas to enter your living environment, turning a heating appliance into a silent threat. Until the manufacturer installs the correct hardware to ensure a tight seal, the integrity of that barrier remains compromised.

Who is most at risk

Carbon monoxide is an invisible, odorless gas that essentially steals the oxygen your body needs to survive. When a boiler door fails to seal properly, as described in this Rinnai recall, these dangerous gases can leak directly into the living spaces of your home. While anyone sharing air with a malfunctioning unit is technically at risk, certain groups face significantly higher dangers due to their physiological makeup or daily routines.

Children and infants are among the most vulnerable populations for several critical reasons. Their bodies are still developing, and they breathe more rapidly than adults relative to their body size. This means that for every breath they take, they are inhaling a larger proportion of carbon monoxide compared to an adult in the same environment. Furthermore, young children often spend extended periods playing on floors or in bedrooms where heavier-than-air gases might accumulate if ventilation is poor. Because they cannot articulate symptoms like "I feel dizzy" or "my head hurts" clearly until it is too late, a silent CO leak poses a uniquely severe threat to this age group.

Elderly individuals and those with pre-existing respiratory or cardiovascular conditions also face heightened peril. Carbon monoxide binds to hemoglobin in the blood much more strongly than oxygen does, effectively starving the heart and brain of essential fuel. For someone with heart disease, angina, or chronic obstructive pulmonary disease (COPD), even low levels of exposure can trigger severe chest pain, shortness of breath, or cardiac events. Their bodies may already be struggling to deliver oxygen efficiently; adding carbon monoxide to the mix can overwhelm their compromised systems rapidly, leading to confusion, loss of consciousness, or worse, often before they realize something is wrong.

Pregnant women are another group requiring extreme caution. Carbon monoxide crosses the placental barrier easily, meaning the fetus receives the same reduced oxygen supply as the mother. Since fetal tissues are developing rapidly and have a higher metabolic demand for oxygen, exposure can lead to serious complications or developmental issues. The mother may experience mild symptoms that she attributes to normal pregnancy fatigue, delaying recognition of the hazard until it affects both her and the unborn child.

Additionally, consider who sleeps in the rooms closest to where these boilers are installed. Rinnai i-Series Plus units are wall-mounted residential boilers, often found in utility closets, basements, or attached garages that share air with living spaces. If you sleep in a bedroom adjacent to or directly above the unit, you are exposed for eight to ten hours continuously while unconscious and less able to react to subtle warning signs like headaches or nausea. This prolonged, uninterrupted exposure during sleep is particularly dangerous because it allows carbon monoxide levels to build up steadily without your awareness.

Ultimately, the risk is not just about who owns the boiler, but who lives in the home and how their bodies process oxygen. If you fall into any of these categories, or if anyone in your household does, treating this recall with immediate urgency is not just a recommendation—it is a vital health safeguard.

How to tell if you have the recalled item

If you own a Rinnai i-Series Plus residential wall-mounted gas boiler, it is critical to verify whether your specific unit falls within this recall before taking any further action. Because these boilers are installed in homes across the country and look nearly identical from the outside, relying solely on the brand name or general appearance is not enough. You must check the specific model numbers and serial information printed on the unit itself. The recall applies exclusively to rectangular metal boilers that feature the Rinnai name printed in black near the top of the front panel, along with a temperature display and keypad located near the bottom.

The most reliable way to identify your boiler is by looking at the top white label situated on the side of the unit. This label serves as the primary identifier for the product’s manufacturing details. You need to look for the phrase "MADE IN JAPAN" clearly printed on this sticker. Directly below or adjacent to that origin statement, you will find the specific model number followed by a reference code enclosed in parentheses. Immediately following that is the text "TYPE OF GAS NATURAL GAS," and finally, the "SERIAL NO." which consists of a combination of letters and numbers. It is vital to record this serial number exactly as it appears, as Rinnai will use it to confirm your eligibility for the free repair.

According to the CPSC recall notice issued on June 5, 2025, this specific safety alert targets only four model numbers within the i-Series Plus line. You must check your side label to see if your unit matches one of the following: IP175S, IP199S, IP175199C, or IP199199C. If your boiler bears any other model number, it is not included in this specific recall regarding carbon monoxide leakage due to seal failure. However, if your unit matches one of these four models, you should treat it as potentially hazardous until a certified technician has inspected and repaired it.

While the recall notice does not provide a list of retailers or a specific date range for when these units were originally sold, the presence of the "MADE IN JAPAN" label and the specific model codes are your definitive guides. Do not guess based on the age of your home or the year you purchased the boiler. Instead, carefully read the white side label. If you find one of the four listed model numbers, stop using the boiler immediately. Contact Rinnai America Corporation at 800-621-9419 between 8 a.m. and 8 p.m. ET, Monday through Friday, or visit their online support portal to schedule your no-cost repair. Do not attempt to open the boiler door yourself to check for loose screws, as this may worsen the seal or expose you to gas.

What to do — step by step

Your refund, repair, or replacement options

If you own one of the affected Rinnai i-Series Plus residential wall-mounted gas boilers, it is important to understand exactly how this recall resolves the safety issue. The primary remedy provided by Rinnai America Corporation is not a simple mail-in return or a direct cash refund for the entire unit. Instead, the company has arranged for a specialized repair process designed to correct the manufacturing defect that allows carbon monoxide to escape. Specifically, the issue stems from incorrect screws used in the boiler door assembly, which can prevent the door from sealing properly. To fix this, Rinnai will have a certified technician come to your home to install the necessary repair components at absolutely no cost to you. This approach ensures that the critical safety mechanism is restored correctly by someone with the proper technical training, rather than attempting a DIY fix that could leave the unit unsafe.

You do not need to wait for this service appointment to begin protecting your household. While you are waiting for Rinnai to schedule the repair, the recall notice strongly advises that if you must continue using the boiler for heat, you take immediate precautions. You should ensure that working carbon monoxide alarms are installed on each level of your home and outside every sleeping area. These alarms serve as your last line of defense against the specific hazard posed by this defect—carbon monoxide poisoning—which is odorless and colorless. This interim safety measure is crucial because the repair has not yet been performed, and the risk remains until the certified technician completes the work.

To initiate the remedy and schedule your free repair, you need to contact Rinnai directly through one of their designated recall channels. You can call their toll-free number at 800-621-9419, available from 8 a.m. to 8 p.m. ET, Monday through Friday. Alternatively, you may reach them via email at recall@rinnai.us or by visiting their support website at https://www.rinnai.us/support/recalls. You can also navigate to the main Rinnai website and click on "Recall" at the bottom of the page for additional information. There is no mention in the official recall facts of a refund option for the purchase price of the boiler itself, nor is there a standard replacement unit offered as an alternative. The focus is entirely on correcting the defect through professional service. Therefore, do not discard your current unit or attempt to sell it; instead, keep it installed until the technician arrives to perform the repair. This ensures that the process is handled efficiently and safely, aligning with the Consumer Product Safety Commission’s guidance for this specific hazard.

What can happen if you ignore it

It is completely understandable why you might hesitate to stop using your heating system, especially during the colder months when comfort and warmth are priorities. The temptation to wait for a convenient time to schedule a repair or to simply keep the boiler running while you figure out the logistics is a common human reaction. However, ignoring this specific recall is not merely an inconvenience; it is a decision that places your household in direct contact with a silent, invisible threat. Because the hazard involves carbon monoxide (CO) poisoning, the consequences of delay are not about mechanical failure or wasted money—they are about physical health and safety.

The core issue with this Rinnai i-Series Plus recall is that the boiler door may fail to seal properly due to incorrect screws. In a functioning gas boiler, combustion gases should be entirely contained within the unit and vented safely outside your home. When the seal fails, those gases leak into the living space. Carbon monoxide is particularly dangerous because it is colorless, odorless, and tasteless. You cannot see it, smell it, or detect its presence with your senses. This means that a household could be exposed to lethal levels of CO for hours or even days without anyone realizing there is a problem until symptoms appear.

If you continue to use a recalled boiler while awaiting repair, you are essentially allowing a potential source of poisoning to operate in your home continuously. The consequences of exposure vary depending on the concentration of the gas and the duration of exposure, but they can range from mild, flu-like symptoms to severe health crises. Early signs of carbon monoxide poisoning often mimic common illnesses, including headaches, dizziness, weakness, upset stomach, vomiting, chest pain, and confusion. Because these symptoms are easily mistaken for the flu or fatigue, individuals may not connect their illness to the boiler, leading to a dangerous delay in seeking fresh air and medical attention.

In more severe cases, prolonged exposure to high levels of carbon monoxide can lead to loss of consciousness, brain damage, and even death. This risk is compounded by the fact that we often sleep with our windows closed and doors shut, allowing CO to accumulate undetected in bedrooms and living areas throughout the night. While the CPSC has reported no incidents or injuries related to this specific recall as of June 5, 2025, the absence of reported cases does not mean the risk is zero. It simply means that no one has yet been harmed. Relying on luck is never a safe strategy when dealing with gas appliances.

Furthermore, ignoring the recall ignores the fundamental design flaw. The incorrect screws are not a temporary glitch; they are a manufacturing defect that prevents the unit from operating as intended. Every hour the boiler runs, it continues to release combustion byproducts into your indoor air quality. This does not just affect your immediate comfort; it affects the long-term health of everyone in the home, particularly those who spend more time indoors or have compromised respiratory systems. The peace of mind that comes from knowing your heating source is safe is worth far more than the temporary discomfort of having a technician visit your home.

Ultimately, the consequence of ignoring this recall is surrendering control over your environment’s safety to a mechanical failure you cannot see. By acting immediately—stopping use and contacting Rinnai—you eliminate this risk entirely. The remedy provided is free, and the process is designed to be handled by certified technicians who will restore the integrity of the seal. There is no benefit to waiting, but there is a significant, life-threatening risk in doing so. Your safety is not something that can be repaired after the fact; it must be protected proactively.

Staying safe: broader tips

While this specific recall addresses a manufacturing defect in certain Rinnai boilers, the underlying risk of carbon monoxide (CO) poisoning is a serious, silent threat that affects many households with gas-fueled appliances. Carbon monoxide is an odorless, colorless, and tasteless gas produced whenever fuel is burned. Because you cannot detect it with your senses, relying solely on the equipment itself for safety is never enough. The most critical step you can take is to install carbon monoxide alarms on every level of your home, particularly near sleeping areas. These devices are not just accessories; they are your primary line of defense when ventilation fails or combustion systems malfunction. Ensure that these alarms are tested monthly and have fresh batteries, or replace them if they are hardwired and the backup battery is dead. Modern CO alarms often feature digital displays that show the exact concentration of gas in parts per million, helping you understand the severity of a situation before symptoms like headaches, dizziness, or nausea set in.

Beyond alarms, regular maintenance of your heating system is essential for long-term safety. Gas boilers, water heaters, and furnaces should be inspected annually by a qualified technician who can check for cracks in heat exchangers, blocked vents, and improper gas pressure. Over time, corrosion or wear can compromise the integrity of these components, leading to leaks even in units that were initially manufactured correctly. Never attempt to adjust the flame height or bypass safety controls on your boiler yourself; these adjustments require specialized knowledge and tools. If you notice yellow or flickering flames instead of a steady blue one, or if you smell gas near your appliance, turn off the unit immediately and ventilate the area by opening windows and doors before calling for professional help.

Finally, stay proactive about product safety by signing up for recall alerts. The Consumer Product Safety Commission (CPSC) and manufacturers frequently issue recalls when hidden defects are discovered long after purchase. You can register your appliances with the manufacturer upon installation to receive direct notifications. Additionally, periodically check the CPSC website or sign up for their email updates to ensure you are aware of any new safety notices affecting your home’s systems. Being informed and prepared transforms a potential crisis into a manageable situation, keeping your family safe from invisible dangers.

• Install CO alarms on every floor and outside all sleeping areas.
• Schedule annual professional inspections for all gas-burning appliances.
• Never ignore warning signs like strange odors, pilot light issues, or soot buildup.
• Register your products with the manufacturer to receive direct recall notifications.