The device of the boiler air heater and the principle of its operation

A boiler air heater is a flexible and effective choice for heating your house. During the winter months, these systems are intended to warm the air in your living areas and create a cozy atmosphere. However, how do they function? And how do they differ from other types of heating systems? Let’s examine how a boiler air heater functions and comprehend the main parts and ideas that drive it.

Fundamentally, a boiler air heater transfers heat into the air using a heat exchanger from a source—typically hot water or steam. The heat is produced by the boiler and sent to the air heater via a system of pipes. The air is then circulated into the rooms via ducts or vents after being warmed by the air heater’s heat exchanger. This technique guarantees constant warmth by distributing the heat equally throughout your house.

A boiler air heater system’s flexibility is one of its advantages. It can produce the heat required for the air heater using a variety of fuel sources, including electricity, natural gas, and oil. Because of their versatility, you can select a system that best fits your needs and your budget. Moreover, these systems can be integrated with other home heating options, giving you the ability to design a personalized approach to home comfort.

After going over the fundamentals, let’s examine the parts of a boiler air heater in greater detail and discover the essential characteristics that enable these systems to function efficiently. This expanded comprehension will assist you in selecting, installing, and maintaining a boiler air heater in your house.

Component Description
Heat Exchanger This is the core part of the air heater, where heat is transferred from the boiler"s hot water or steam to the air being heated. It typically consists of metal tubes or coils.
Fan The fan circulates air over the heat exchanger, allowing the warmed air to be distributed throughout the space. It"s usually controlled by a thermostat or other regulator.
Boiler The boiler generates the hot water or steam used to heat the exchanger. It can be powered by gas, oil, or electricity, depending on the system.
Thermostat The thermostat monitors the temperature and controls when the boiler and fan turn on or off. It helps maintain a consistent indoor temperature and energy efficiency.

The purpose of the air heater

Heat is produced in the supplied air and exhaust gases are cooled simultaneously by the device. The boiler unit’s coefficient of beneficial action is increased by air heating.

At the TPP, two kinds of devices are in use:

  1. Regenerative. Is a heat exchanger, constantly rotating at low speed. At the same time, the same surface heats up from combustion products and gives heat to the air supply to the firebox.
  2. Recuperative. Have a rigidly installed heating surface. They are distinguished by simplicity of design. The disadvantage of devices of this type is that their working surface is subject to corrosion.

Regenerative heaters

Regenerative type boiler air heaters are built with a large diameter rotor. It constructed components that heat up when high-temperature combustion products flow past them.

The heating elements move through the air supply to the furnace as they rotate. As a result, before entering the combustion chamber, the air mass is heated. Metal plates gathered into discrete packages make up the heat exchanger’s components. They create voids among themselves when they make contact with the plate. They are essential for air movement, the production of combustion products, and the quickening of heat exchange.

Spinning (RVP)

In high-power boilers, regenerative air heaters (RVP) are most frequently used to warm the air mass. Partitions separate the device’s rotor into sectors.

They stop the plates in adjacent sections from heating up too much. Revolving slowly is the rotor’s speed. A complete revolution takes ten to thirty seconds to complete.

An electric engine powers the regenerative heater’s rotor. A motor with a capacity of 3 to 5 kilowatts is sufficient for regular use. Rotating devices come with advantages as well as disadvantages.

Among the benefits are:

  1. Compactness. Compared to tubular -type structures, RVP has smaller sizes. Compactness is achieved due to the large area of the heat exchanger plates.
  2. Small consumption of metal parts. Parts of RVP are less prone to corrosion.
  3. High efficiency.

The requirement for the shaft cooling system, which powers the rotor and a sizable air outflow into the exhaust gases, is one of the drawbacks.

A boiler air heater is a key component in many home heating systems, designed to heat the air that warms your house. It works by circulating hot water or steam from the boiler through a heat exchanger. As the air from your home"s ventilation system passes over the heat exchanger, it absorbs the heat and warms up. This heated air is then distributed throughout your home via ducts, creating a comfortable indoor environment. The basic principle is straightforward: hot water or steam from the boiler heats the metal of the heat exchanger, and the air picks up that heat as it flows over the surface. Proper maintenance of both the boiler and the air heater ensures efficient operation and long-term reliability, keeping your home cozy even during the coldest months.

Types of recuperative air heaters

Tubular devices are the most widely used for heating the air supply to the combustion chamber. There are various varieties of air heaters with unique designs.


These kinds of devices are made up of plates. Carbon steel is used in the production of them.

The exhaust gases travel through vertical, slender channels. The air heater’s individual asbestos cubes. The insulating layer is between 0.6 and 0.7 cm thick. Combustion products that are passing between the plates warm the air mass that is cleaning the surface. This is the process by which air is heated before it enters the furnace.

The plates’ shape changes when exposed to high temperatures. This causes the connecting seams to burst, allowing air to enter the exhaust gas canal and release exhaust.

Heaters of the plaque type are prone to ash suction blocks on a regular basis. This is because the holes made for the combustion products’ path are so tiny. Blocks of blockages require a lot of work to clean.

Different sized plates are used in the production of the heater’s cubes. The thicker sheets are found closer to the firebox. This is because it’s necessary to shield the metal components from corrosion that results from combustion products.

Glass air heaters

The installation of a glass heater is done to stop surfaces from suffering from severe corrosion caused by sulfur fuel sulfate combustion products. The heater is designed as a block of glass pipes. The glass device’s low resistance to mechanical damage is one of its distinguishing characteristics.

The size of glass elements increases and decreases in response to changes in temperature indicators. For this, pipes must be fastened to the boards using elastic cuffs. PRIOR PARTS in a glass tubular device are identical to those clogging a comparable metal heater in terms of intensity. The glass structure exhibits a high level of corrosion resistance.

Tubular steel

A cube made of metal pipes is the device. Their diameter may vary depending on the heater’s size. The pipes’ edges are welded to metal boards as part of the design. The pipes’ dimensions alter as the surface temperature rises. The upper board can move freely to compensate for thermal expansion. By doing this, mechanical damage to the pipes during heating and cooling is eliminated.

The simplicity of a recuperative tubular air heater is its defining feature. The pipes are vertical and are welded to the boards.

They pass through the combustion products that are released during boiler operation. Air mass washes the area in between the pipes. The air moves horizontally in this instance.

When the device is divided by transverse partitions, the air mass movement path is formed. Part of the heat is released into the air as combustion products are cooled as they pass through the heater. Thus, the furnace receives the heated air mass. The boiler’s efficiency rises as a result. The degree of ash blockage in the gas movements is lessened by their vertical arrangement. These kinds of devices are very efficient and dependable.

Products that are designed with steel pipes have the drawback of being susceptible to corrosion from metal-on-metal contact with combustion and condensate products.

Cast iron

There is less usage of this kind of air heater. Large design is to blame for this. The apparatus is a cube made of cast-iron pipes.

In order to increase the area of contact with air mass, their outer surface is ribbed. The cube’s cast iron components are arranged vertically. High-temperature spent gas circulates inside. Here, some of the heat is transferred to the cast iron, which warms the air mass that enters the boiler.

Heating cast iron products come with benefits and drawbacks. The large supply of pipe wall thickness that extends the service life of parts and the structure’s high resistance to corrosion that happens during condensate formation are advantages.

Drawbacks of the cast iron design:

  • large metal costs. Much more material is required for manufacture than for steel analogues;
  • Dimensions. Bulky cast -iron products;
  • Increased resistance. Occurs due to the ribbed surface of the elements.

Compared to their steel counterparts, cast iron structures are less common. They are typically installed in tandem with different kinds of air heaters.

Knowing how a boiler air heater operates will make you appreciate the technology that provides comfortable and warm heating for your home. These devices basically create warm air throughout your house by heating water or producing steam. This procedure guarantees effective heating, so even in the coldest months you can live in comfort.

A heat exchanger, which converts hot water or steam into heat for the air passing over it, is the central component of the system. After that, ducts are used to distribute this heated air throughout the various rooms in your home. This system’s ability to quickly and evenly distribute warmth offers consistent comfort without consuming a lot of energy.

The importance of routine maintenance cannot be overstated. You can increase the longevity of your boiler air heater and prevent unplanned malfunctions by making sure the heat exchanger and other parts are clean and in good working order. A professional’s routine inspections can help detect problems early and ensure that your heating system runs effectively all year long.

To sum up, heating your home with a boiler air heater is dependable and efficient. Because it uses a duct system to distribute heat evenly, it’s perfect for maintaining a cozy and warm living area. It won’t break the bank and can give you years of dependable service keeping the cold at bay with proper maintenance.

Video on the topic

Four hours of work or how a cube of an air heater is collected

Regeneration air heaters

Air heater

Air valve (air vent) for the boiler – device, prevention, repair.

Thermal pump: device and principle of operation

Training under the program "Boiler room operator" (part 1)

The steam boiler DKVR

What type of heating you would like to have in your home?
Share to friends
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.

Rate author
Add a comment