Chimney for a gas heater – corrugated and steel ducting

An effective heating system is essential for keeping your house warm and comfortable during the winter. The chimney is a vital part of many heating systems because it allows dangerous gases to escape and maintains adequate airflow. This post will examine the various options for chimneys made especially for gas heaters, with a particular emphasis on the widely used corrugated and steel ducting.

Many households choose gas heaters because of their dependability and efficiency. But for them to function safely and efficiently, they need the right ventilation, just like any other heating system. The chimney enters the picture here. The chimney keeps dangerous gases like carbon monoxide from building up inside the house and protects the health and safety of its occupants by redirecting exhaust gases outside of it.

Gas heaters often choose corrugated chimneys because of their adaptability and simplicity of installation. These chimneys, which are made of sturdy materials like stainless steel, have ribbed designs that permit expansion and contraction to accommodate temperature changes without running the risk of damage. Whether you’re installing a new system or upgrading an old one, their adaptability makes them suitable for a variety of heating setups.

However, steel ducting chimneys provide a more reliable and conventional method of venting gas heaters. These chimneys are made of sturdy steel pipes that can withstand extreme weather and high temperatures. They offer exceptional durability and longevity. Although they might be more difficult to install than corrugated chimneys, many homeowners choose them because of their superior performance and dependability.

For your gas heater, it’s important to weigh the pros and cons of corrugated versus steel ducting chimneys, taking into account things like installation costs and ongoing maintenance requirements. You can choose the option that best meets your home heating needs by carefully considering the benefits and drawbacks of each.

Material Corrugated
Type Steel ducting

Choosing the correct chimney for your gas heater is essential for effectively and safely heating your home. Choosing between a steel ducting chimney and a corrugated chimney has benefits and drawbacks. Because they are flexible and frequently less expensive, corrugated chimneys can be installed in a variety of ways. Steel ducting chimneys, on the other hand, offer toughness and dependability, making them perfect for extended use in challenging environments. Knowing the distinctions between these choices will enable you to choose wisely, ensuring the safety and best operation of your gas heating system.

What are the chimneys for columns

The material for the chimney in a multi-story building has already been chosen in compliance with the most recent building codes. Other than when turbocharged columns are installed, it doesn’t need to be changed. Typically, a concrete channel inside the slabs or an integrated brick chimney—either with or without a metal sleeve—are utilized.

Gas flue pipes are chosen for installation in private homes in compliance with the relevant regulatory documentation and the installed water heater manufacturer’s recommendations.

Corrugation for gas column

The specifications for materials that can be used as chimney pipes are outlined in SP 42-101-2003. The use of corrugated ducting for a gas heater is not prohibited by the regulations. While there isn’t a clear ban at the local level, replacing the corrugated sleeve with straight stainless steel or galvanized pipe might be necessary. It is preferable to install corrugated on the column following advice from an inspector who is a gas service representative.

There are various kinds of chimney sleeves that are used:

  • Flexible corrugation for gas heater made of stainless steel – the walls have a thickness of 0.12- 1 mm. Resistant to heat (maximum temperature 900°C) and acidic environment. Stainless steel corrugated flue pipe is the best option for connecting a gas water heater. The sleeve can be bent well and stretched if necessary.
  • Corrugated aluminum pipe – maximum heating temperature 500°C. Aluminum is not suitable for connection of gas water heating equipment, quickly burns out and becomes the cause of carbon monoxide in the room. Another significant disadvantage: aluminum flue pipe is very hot, which is also a potential danger.
  • Galvanized corrugated pipe – heating temperature 600°C. Approved for use for water heaters with flue gas temperature up to 300-400°C. Galvanized chimneys for gas boilers are allowed to connect low-temperature and high-temperature boilers.

It is important to ascertain whether corrugated aluminum pipe can be used for gas water heaters before utilizing it. Only solid stainless steel or galvanized pipe may be used to connect a water heater in some areas of the Russian Federation.

A special focus is placed on the manufacturer’s operating manual for the water heater. The connection is made strictly in compliance with the previously mentioned guidelines.

Coaxial ducts

Connecting a coaxial type chimney to a water heater that has a forced oxygen supply and combustion product discharge is intended. It is a double-flue pipe based on its construction. Flue gases are carried by the inner cavity, while oxygen is drawn from the street by the outer cavity. Additional ventilation in the room is not required for a gas column with a coaxial chimney. when the air in the room is not scorched by burning.

Coaxial pipes are composed of stainless steel, plastic, and aluminum. The water heater’s operating characteristics have an impact on the material choice for the chimney:

  • Plastic coaxial chimneys for gas stoves – are relatively inexpensive, lightweight and easy to install. Among the disadvantages is the short life of the polymer. Plastic pipe is suitable only for condensing columns with flue gas temperature up to 250 ° C.
  • Stainless steel is a durable metal that is resistant to severe thermal stresses. Provided production of insulated and uninsulated pipes. The latter are characterized by improved thermodynamics, which allows their use in apartment buildings.
    A closed-type gas column with a stainless steel coaxial chimney is connected to a chimney system of several types:
  • Vertical installation – used in apartment buildings and buildings where technical conditions do not allow the installation of horizontal smoke removal system.
  • The design of the chimney through the wall – a classic connection option, suitable for both private homes and apartments.

Stainless steel coaxial pipe has an approximate 30-year service life. Given that the water heater has a 15-year operating lifespan, the chimney will function silently for the duration of the unit.

Stainless and enameled

Solid stainless or enameled steel pipes should be used to connect water heaters in situations where gasmen prohibit the use of corrugated sleeves. Every kind of material has benefits of its own.

  • Chimneys for gas columns from stainless steel – steel is characterized by durability and resistance to the effects of condensate. Insulated sandwich chimneys are used to enhance the draft characteristics of the connection. Stainless steel can withstand heating up to 900 ° C, neutral to the effects of acidic environment.
  • Enameled chimneys for gas stoves – are made of black metal with the subsequent application of a protective layer. Heat resistant enamel, usually white in color. Products are sensitive to sudden cooling and mechanical damage. The enamel will chip on impact. Corrosion forms in the place of damage. Average service life is 10-15 years.

When purchasing a solid chimney pipe, preference should be given to goods produced by reputable manufacturers. Buying a cheap chimney that doesn’t meet GOST regulations and has a short lifespan is very likely.

How to correctly install the chimney on the column

The specific guidelines for attaching a gas water heater to the chimney system are outlined in SNiP and SP. Experience demonstrates that errors are frequently committed during the pipe installation process. When the gas heater is connected to the chimney incorrectly, malfunctions can occur and can quickly escalate into an emergency.

The gas engineer or stove operator will examine the flue ducts during the yearly inspection, identify any irregularities related to the connection, and provide a certificate for their correction. The heater is disconnected from the gas mains if the adjustments listed are not made. The primary concerns regarding connectivity, as well as frequent errors and infractions, are listed below.

Is it possible to combine the hood with the duct from the column?

Installing a gas water heater in a room with artificial ventilation is strictly forbidden by current regulations. Stated differently, having a gas heater in a room that requires forced exhaust is a flagrant violation of SNiP and SP. The prohibition is in place for a number of reasons:

  • there is a possibility of carbon monoxide entering the room used as a boiler room;
  • there is an increased risk of CO spreading through the ventilation duct to the neighbors living on the floors above.

The following are the prerequisites for the gas column exhaust hood:

  • It is forbidden to install equipment for forced circulation, closing the natural outflow of air from the room;
  • A gas heater and an extractor hood cannot be installed in the same chimney, as the duct is not able to cope with the load, according to SP 62.13330 (SNiP 42-01-2002) . If violations are detected, the gas supply is stopped until they are eliminated.
  • The gas heater can be connected to a ventilation or a duct designed to discharge combustion products. It is strictly forbidden to connect it to the usual kitchen ducting.

When connecting water heaters in older residential buildings, extra caution should be used. In khrushchevkas with gas columns, ventilation is set up such that air exchange occurs naturally through air flow circulation. A Khrushchevka home does not have separate ducts for the toilet and bathroom.

Between each room, a window was built into the wall. It was necessary to open the vent in the partition wall before taking a bath.

Chruschevki are susceptible to any disruption in the flow of air. When the column malfunctions, it can lead to:

  • Glazing with metal-plastic windows – a supply and exhaust valve should be installed in the profile, a 5 cm gap should be left between the door to the kitchen and the floor.
  • It is strictly forbidden to block the vent channel with any equipment to increase the circulation, and even more so the simultaneous inclusion of the hood and a gas column.

Indications that the chimney connection is incorrect: the column randomly extinguishes during operation, pops when it turns on, and ignites more than once.

How to calculate the chimney height for a gas-fired water heater

The proper chimney selection, the definition of the internal cross-section, and the chimney’s elevation above the column all have a significant impact on the draught’s characteristics.

All gas-consuming water-heating equipment must adhere to uniform installation regulations. The following are the installation standards:

  • Heat generators with an upper outlet are connected with the mandatory observance of a vertical section with a length of at least 250 mm, provided that the height of the room does not exceed 2.7 m. The minimum distance from the ceiling to the gas heater hood is 25-30 cm.
  • The height of the exhaust pipe is calculated individually, taking into account the type of roof and distance from the ridge. Regulations apply:
  • at a distance from the ridge of no more than 1.5 m, the pipe rises 0.5 m above the roof;
  • between 1.5-3 m, the chimney is made flush with the top of the roof;
  • At gaps of more than 3 m, the height of the chimney is provided for 10° below the roof ridge.

It is not necessary to calculate the height when installing a coaxial pipe for a turbine water heater, but it is necessary to measure the gaps and distances between windows, the chimney, and other residential building structural elements. The ensuing guidelines are applicable:

0,5 м horizontally to open vents, windows and doors.
1 м Vertical to windows, if the chimney exits directly below them.
0,5 м vertically up to the windows, if the chimney exits directly above them.
2 м from the ground level – regardless of whether someone walks on it or not.

Accurately calculating the chimney height will guarantee a steady draft and impact the water heater’s functionality and efficiency.

How to insulate the gas heater ducting

Insulating chimneys is necessary for a number of reasons:

  • Prevention of condensation – flue gases entering the chimney warm the walls of the chimney. The better the channel holds heat, the less moisture is produced inside.
  • Ensuring good draft characteristics – the faster the chimney warms up and retains heat for longer, the greater the air circulation within the chimney. It is optimal to install external insulated sandwich chimneys at once. But if desired, the pipe can be insulated with basalt wool, covering the top with any foil insulator.
  • Fulfillment of fire safety rules – technical requirements for installation in a wooden house prescribe the use of thermal insulation for fire protection sections, at the passage of floor slabs, walls of the house, roof cake.
    Around the heating surface of the pipe when installing through combustible materials provide a hole larger than the pipe by 5 cm. in diameter. The gap is filled with mineral insulation and then closed with a flange for the chimney of a gas heater.
    The surface on top of the column is finished with any non-combustible finishing material. Suitable for drywall, stretch ceilings, etc. The described measures are the conditions for safe operation of the water heater.

  • Extending the operation of the water heater (it happens that the gas heater freezes through the chimney, which leads to shrinkage of the heat exchanger).

The owner of a private country home is in charge of ensuring that the installation and use of thermal insulation complies with regulations. This owner also covers all material costs related to meeting PPB and SNiP requirements.

How to paint an exhaust pipe

A unique feature of a gas column’s operation is the emission of flue gases during combustion, which typically have a temperature between 300 and 550 °C. The pipe is simultaneously exposed to the surrounding air and an acidic environment. Consider the water heater’s operating characteristics and the load the chimney receives when selecting a paint color.

Paints can be classified into a number of groups conditionally:

  • Priming compounds – protect the surface from corrosion. The range includes mastics and impregnations, eliminating and preventing the appearance of rust, as well as improving the adhesion of paint to the chimney.
  • Organosilicon enamels – after drying can withstand direct heating up to a temperature of 600 ° C. Considering that the temperature of the surface of the chimney rarely rises above 250-300 ° C, paint will reliably protect the surface of the pipe.

For outside work, it is not permitted to open the chimney using regular enamel. Paint can catch fire and ignite if heated excessively.

When selecting a steel ducting chimney or corrugated chimney for a gas heater, it’s important to consider a number of factors to guarantee longevity, safety, and efficiency. Depending on your unique needs and situation, each option has advantages and disadvantages.

Usually constructed of stainless steel, corrugated chimneys are more pliable and simpler to install in confined areas. They offer flexible routing, enabling imaginative solutions in intricate architectural layouts. Their lightweight design also lessens the building’s structural load. Their adaptability, though, can also make it difficult to sustain appropriate alignment and support over time.

Conversely, steel ducting chimneys are suitable for long-term use due to their stability and durability. Their sturdy design reduces the possibility of blockages or leaks and guarantees constant airflow. Many homeowners prefer them because of their dependability and low maintenance, even though installing them may take more work, particularly in small spaces.

When deciding between the two options, it"s essential to consider factors such as budget, building layout, local regulations, and personal preferences. While corrugated chimneys may offer convenience and cost savings upfront, steel ducting chimneys provide peace of mind in terms of reliability and longevity.

Whichever type is selected, safe and effective operation of the gas heater and chimney system depends on correct installation and ongoing maintenance. Speak with an expert in the field to find the best solution for your unique requirements and to make sure that all applicable safety regulations are being followed.

Video on the topic

How to put a corrugation on an exhaust ventilation pipe | Lifehack

aluvent /flexible chimney/

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Sergey Ivanov

I like to help people create comfort and comfort in their homes. I share my experience and knowledge in articles so that you can make the right choice of a heating and insulation system for your home.

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