Wiktor Wise
Sealed combustion furnaces are an advancement in furnace technology that meets all four goals of heating and cooling a home. They are an improvement on the older atmospheric combustion furnaces, which draw air from within the house to create combustion. In contrast, sealed combustion furnaces have a combustion chamber that is sealed off from the house, drawing air through a PVC pipe from outside and sending exhaust outside through a second pipe. This enhances safety by reducing the possibility of combustion danger and the escape of natural gas into the home. It also improves reliability and comfort by preventing the pulling in of debris and maintaining indoor humidity. Sealed combustion furnaces are more energy-efficient, losing less heat to the outside, and help balance humidity by not removing air from indoors.
| Characteristics | Values |
|---|---|
| Combustion chamber | Sealed off from the house |
| Air source | Outside air |
| Exhaust | Sent outside through a pipe |
| Safety | Reduced possibility of combustion danger and escape of natural gas |
| Reliability | Less likely to pull in debris |
| Comfort | Doesn't dry out the air in the home |
| Energy efficiency | More energy-efficient |
| Noise | Quiet operation |
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What You'll Learn
How it works
Sealed combustion furnaces are an advancement in furnace technology, offering improvements in safety, reliability, comfort, and energy efficiency.
The combustion chamber in a sealed combustion furnace is closed off from the house, drawing air from outside through a PVC pipe. This design ensures that the combustion process is isolated from the indoor air, reducing the possibility of combustion dangers and the escape of natural gas into the home. It also minimises noise as the blowing and burning actions occur inside a tightly sealed compartment.
The use of outdoor air for combustion also enhances energy efficiency. The combustion chamber loses less heat to the outside, making the furnace more cost-effective to run. Additionally, sealed combustion furnaces help maintain humidity during winter by not removing air from indoors, as atmospheric furnaces do.
Sealed combustion furnaces also have improved reliability. By drawing air from outside, they are less likely to pull in debris that could dirty the burners and cause ignition problems.
Sealed combustion furnaces are available in various forms, including forced-air furnaces, hot water boilers, space heaters, and water heaters. They are designed to meet specific requirements for vent pipe lengths, elbow usage, and pipe routing angles. Installation should be performed by a licensed professional, and a permit from the local building authority is required to ensure safety and proper installation.
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Safety benefits
Sealed combustion furnaces offer a range of safety benefits over conventional atmospheric furnaces.
Firstly, they reduce the risk of combustion danger outside the furnace. In an atmospheric furnace, the combustion chamber is open to the house, drawing air directly from inside. In contrast, a sealed combustion furnace has a combustion chamber that is closed off from the house, reducing the possibility of combustion issues outside the designated area.
Secondly, sealed combustion furnaces lower the chance of natural gas escaping into the home. Atmospheric furnaces draw air from inside the house, which can lead to a deficit of indoor air and cause outdoor air to rush in, potentially leading to gas leakage. Sealed combustion furnaces, however, use outside air for combustion, maintaining indoor air balance and reducing gas escape.
Thirdly, sealed combustion furnaces minimize the risk of hazardous combustion byproducts entering the home. By isolating the fuel-burning process and exhausting vapors outside, these furnaces reduce the likelihood of toxic byproducts, such as carbon monoxide, affecting the indoor environment.
Additionally, sealed combustion furnaces help maintain indoor humidity levels during winter. Unlike atmospheric furnaces, which can dry out the air in homes by drawing away indoor air, sealed combustion furnaces do not remove air from inside, thus helping to keep the humidity balanced.
Overall, sealed combustion furnaces offer enhanced safety by sealing off the burners, using outside air for combustion, reducing gas escape, minimizing toxic byproducts, and maintaining indoor air quality. These features provide an extra layer of protection and improve overall safety compared to conventional atmospheric furnaces.
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Energy efficiency
Sealed combustion furnaces are an important development in heating technology, offering higher efficiency ratings than their older, atmospheric combustion counterparts.
Atmospheric combustion furnaces are open to the house, drawing air from within to fuel the combustion process. This is an inefficient method as it recirculates and reheats the same air over and over. It also causes an air deficit, leading to drier conditions in the home.
Sealed combustion furnaces, on the other hand, are closed off from the house and draw air through a PVC pipe from outside. This design is more energy-efficient because the combustion chamber loses less heat to the outside, making the furnace cheaper to run. It also doesn't remove air from indoors, helping to maintain humidity levels.
Additionally, sealed combustion furnaces are safer as they reduce the possibility of combustion dangers and the escape of natural gas into the home. They also lower the chance of toxic combustion byproducts, such as carbon monoxide, from entering the home.
Sealed combustion technology is available in most current 90% AFUE efficient (or higher) forced-air furnaces, as well as a variety of other heating appliances such as hot water boilers, wall-mounted gas heaters, and water heaters. When considering a sealed combustion furnace, it's important to consult a licensed professional for installation and obtain the necessary permits to ensure safe and proper implementation.
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Installation
Sealed combustion furnaces are safer and more efficient alternatives to conventional furnaces. They draw air from outside the house through a PVC pipe, and the exhaust is sent out through another pipe, ensuring that the combustion process is entirely isolated from the indoor air.
The installation of a sealed combustion electric furnace should be done by a licensed professional, and a permit from the local building authority is required. The professional will guide you through the process and help you choose the best heating system for your home.
The installation process will involve the following steps:
- Initial Assessment: The professional will assess your current heating system and the space where the new furnace will be installed. They will also discuss your comfort needs and energy-saving goals.
- Selecting the Furnace: The professional will help you choose the right type and model of sealed combustion furnace, considering factors such as efficiency, safety, and compatibility with your existing HVAC system.
- Obtaining Permits: The installer will obtain the necessary permits from the local building authority. This is an important step to ensure that the installation complies with safety regulations and that a final inspection can be conducted.
- Preparing the Space: This may involve removing your old furnace and preparing the area for the new installation, including any necessary ductwork or piping adjustments.
- Installing the Furnace: The professional will install the sealed combustion furnace according to the manufacturer's instructions, ensuring proper placement and connections. This includes correctly positioning and routing the intake and exhaust pipes, following the specific requirements for length, elbow usage, and angles.
- Testing and Inspection: Once installed, the furnace will be tested to ensure it is functioning properly and safely. The final inspection by the local building authority will also be conducted to approve the installation.
- Maintenance Guidance: The installer will provide you with guidance on how to maintain your new furnace to ensure optimal performance and longevity.
By following these steps, you can ensure that your sealed combustion electric furnace is installed correctly, safely, and in compliance with local regulations.
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Comparison to atmospheric furnaces
Sealed combustion furnaces are an advancement in furnace technology, aiming to replace the older atmospheric combustion furnaces. Atmospheric furnaces are the standard natural gas furnaces of the past few decades.
Safety
Sealed combustion furnaces improve safety by sealing off the burners from the house, reducing the possibility of combustion danger outside the furnace and lowering the chance of the escape of natural gas into the home. The combustion process is isolated from the air in the house, reducing the likelihood of hazardous combustion byproducts, such as carbon monoxide, from entering the home.
Reliability
Sealed combustion furnaces are more reliable as they are less likely to pull in debris that might cause the burners to become dirty and malfunction.
Comfort
Atmospheric furnaces draw air from inside the home, creating a deficit of air, which must be replaced by air from outside, which is usually drier in the winter. This can cause an influx of cool, dry air, altering the temperature and humidity within the home. Sealed combustion furnaces, on the other hand, draw air directly from outside, preventing the removal of heated indoor air and maintaining a balanced humidity during winter.
Energy Efficiency
Sealed combustion furnaces are more energy efficient as they lose less heat to the outside. The combustion chamber draws air through a small PVC pipe, minimising heat loss. Atmospheric furnaces, on the other hand, have an open combustion chamber, allowing heat to escape.
In summary, sealed combustion furnaces offer improved safety, reliability, comfort, and energy efficiency compared to atmospheric furnaces, making them a more advanced and cost-effective heating solution for homes.
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Frequently asked questions
A sealed combustion furnace is an advanced type of forced-air heating that uses outside air for the combustion process, which takes place in a sealed combustion chamber.
A sealed combustion furnace draws in air through a PVC pipe from outside the house to fuel the combustion process. Another pipe attached to the combustion chamber sends out the exhaust.
Sealed combustion furnaces offer improved safety, energy efficiency, and comfort. The isolation of the fuel-burning process reduces the chance of toxic combustion byproducts, such as carbon monoxide, from entering the home. They are also more energy-efficient as the combustion chamber loses less heat to the outside. Additionally, they help maintain humidity levels during winter by not removing air from indoors.
While not a disadvantage per se, sealed combustion furnaces require installation by a licensed professional and a permit from the local building authority. This process ensures a safe and proper installation.
