Repair instructions for a Navien gas boiler: from its design to step-by-step do-it-yourself actions

Autonomous boiler houses are very popular among consumers. Their main advantage is that they allow you to equip a heating system independent of the centralized heat supply.

At the moment, there are several types of boilers, which differ in the type of fuel. They are gas, solid fuel, electric. But the most popular are gas boilers, since this type of fuel has many advantages: low price, high efficiency and instant heating of the room.

However, do not forget about its fire and explosion hazard. The round-the-clock operation of equipment leads to the fact that parts begin to wear out, and various components fail. In order for the system to operate as efficiently as possible, it is necessary to perform regular maintenance and timely repair of the boiler.

Elimination of existing defects extends the service life of the heating system and allows you to avoid emergency situations.

The APPES engineering service repairs Navien gas boilers in Moscow and the Moscow region.

We are the leader in this service market and offer our clients the best prices. All parts and repairs are provided with an official guarantee.

All transport costs are already included in the cost of repairs, which saves you money. We also install and service gas boilers.

What is a gas boiler Navien Deluxe Coaxial 24k

The South Korean company KyungDong NAVIEN specializes in the production of heating systems and auxiliary equipment.
Gas boilers from this manufacturer are very popular in Russia because they have high build quality, are relatively cheap, and are adapted to Russian conditions.

Navien Deluxe Coaxial is a reliable and unpretentious equipment, adapted to low pressures of water and gas, resistant to voltage surges in the electrical network.

The double-circuit boiler Navien Deluxe Coaxial (Navien Deluxe Coaxial) in past years had a different name - Navien Ace 24 E. The letter E means “Euro”, which denotes the coaxial type of chimney.

It is designed on the “pipe-in-pipe” principle, where the inner part is a chimney, and the outer part is an air duct that supplies air for turbocharging.

The boiler is a double-circuit boiler that prepares hot water supply and heating systems via separate lines. One of the features of Navien boilers is a separate heat exchanger that separately heats the heating fluid and hot water for domestic needs.

It is made of stainless steel, providing high resistance to corrosion.

IMPORTANT! The efficiency of a stainless steel heat exchanger is equal to that of copper units thanks to a turbocharging system that supplies air flow into the combustion chamber and increases the flame temperature.

We repair all gas boilers, including

• ACV
• Alphatherm
• Ariston
• Baxi
• Beretta
• Bosch
• Buderus
• Dakon
• De Dietrich
• Electrolux
• Ferroli
• Fondital
• Frisquet
• Immergas
• Junkers
• Kiturami
• Mora
• Navien
• Protherm
• Rinnai
• Roca
• Sime
• Siberia
• Thermona
• Tiberis
• Vaillant
• Viadrus
• Viessmann
• Westen
• Wolf
• Zhukovsky
• Lemax

Characteristics of Navien boilers

Manufacturers of the Navien gas heating system provide a long warranty on their equipment. The boilers are of high build quality and very rarely break down. But even if difficulties arise, problems can be quickly resolved.

Technical features

Navien is one of the leading manufacturers in South Korea. The manufactured equipment is in great demand in more than 30 countries around the world. The model line includes both single- and double-circuit boilers, including:

• operated on liquefied gas;
• turbocharged;
• condensation

These products have several types of boilers

There are both wall-mounted and floor-mounted equipment. The latter is perfect for installation in country houses. This system supplies the room with heat and hot water. In addition, the floor-standing unit is compact and easy to use.

In general, the Ace, Deluxe, and Prime models are very popular in Russia. These types of systems are maximally adapted to pressure drops and unstable operation of the electrical network.

In this video you will learn how the Navien boiler works:

System advantages

Gas boilers of this brand are not only of high build quality, but also have an affordable price. In addition, the following advantages of the systems can be highlighted:

1. The control unit is equipped with a special microprocessor that protects the equipment from power surges.
2. The operating mode is supported automatically, there are many settings options.
3. Long service life.
4. Possibility of working on liquefied and natural gas.
5. The boiler continues to operate when the pressure drops to 0.1 bar.
6. In case of problems with gas, the equipment does not freeze. When the temperature drops to +5°C, the burner automatically starts working. If ignition is not possible, the circulation pump operates. Such measures reliably protect the system from freezing.
7. The adjustment is simple and straightforward.

This boiler is cost effective

Operation, diagnostics and repair

Installation, connection and first switching on are recommended to be carried out in the presence of representatives of gas services. Installation is carried out by certified specialists. Otherwise, repairs can cost a pretty penny.

You can perform the installation yourself, but only if you carefully follow the manufacturer's instructions. An important part of this work is the correct selection and installation of a smoke removal system.

Operations with the heater are described in detail in the instructions. Studying the positions is a fundamental factor in the flawless operation of the device.

Despite the highest reliability, like any other complex equipment, the Navien boiler requires repairs from time to time. It is recommended to contact the service.

Navien service centers offer a wide range of services, including the following types of work:

• Diagnostics followed by complete or partial replacement of units.
• Repair of units.
• Installation and post-warranty service.
• Cleaning radiators and pipes from scale and other deposits using special compounds.
• Replacement of consumables, gaskets and fastening elements.

Some “breakdowns” can be fixed independently.

To do this, you need to correctly recognize the cause of the malfunction and correctly assess your own knowledge and possible consequences. The built-in diagnostic system can help with this. The device displays codes - alphanumeric readings that indicate a particular failure.

Navien boiler remote control display

So code 01e means that the equipment has overheated. This can happen due to pump failure or clogged pipelines. In this case, check the condition of the pump impeller for integrity and jamming. They also check the resistance in the coil, that is, they determine whether there was a short circuit. It is recommended to determine whether there is airing. If so, the repair involves bleeding the air from the system.

Code 03e indicates an ignition problem. There are several reasons. This is a failure of the ionization sensor, a stop in the gas supply, or a break in the grounding circuit. The flame sensor is cleaned of dirt with a needle, and deposits on the electrode are removed with fine sandpaper.

There are about two dozen codes. The code table is attached to the instructions. If there is no code on the screen, but an unusual noise is heard, then this happens due to insufficient pipe capacity. Scale is formed due to poor quality coolant. It is drained and replaced with a new one.

The water heating temperature is also reduced. The boiler power may be too high for your system. Cleaning the heat exchanger is recommended. If it does not give results, the heat exchanger will have to be changed.

The reasons for failures are identified by things that are first checked independently. For example, clean the filter or assess the integrity of the wiring, the opening of valves, the presence of gas and water in the supply system, etc.

Strictly do not interfere with electronics, even if you have the appropriate education. This can only be done by specialists of a specific profile.

Heat exchanger

Settings

“Navien” is programmed for winter (heating and DHW) and summer (DHW) operating modes - with the “Snowflake” and “Sun” icons. The network temperature is adjusted on the LCD remote control when the “radiator” icon on it is lit. In some options, the “Heating Mode” is started, in others the knob is turned. A flashing LED records the set water temperature.

If the icon just lights up without pulsating, the actual temperature in the network is displayed. By selecting the icon, use “+” or “-” to increase or decrease the temperature. After a couple of seconds the LED will stop flashing and show the actual temperature. They regulate the heating temperature from 40.0 C to 80.0 C. If it is set incorrectly, an error code will be displayed.

Note! DHW temperature adjustment is carried out in the same way, only on the remote control there are pictograms with a tap, range from +30 to +60 C

Characteristics of Navien boilers

Manufacturers of the Navien gas heating system provide a long warranty on their equipment. The boilers are of high build quality and very rarely break down. But even if difficulties arise, problems can be quickly resolved.

Technical features

Navien is one of the leading manufacturers in South Korea. The manufactured equipment is in great demand in more than 30 countries around the world. The model line includes both single- and double-circuit boilers, including:

• operated on liquefied gas;
• turbocharged;
• condensation

There are both wall-mounted and floor-mounted equipment. The latter is perfect for installation in country houses. This system supplies the room with heat and hot water. In addition, the floor-standing unit is compact and easy to use.

In general, the Ace, Deluxe, and Prime models are very popular in Russia. These types of systems are maximally adapted to pressure drops and unstable operation of the electrical network.

In this video you will learn how the Navien boiler works:

System advantages

Gas boilers of this brand are not only of high build quality, but also have an affordable price. In addition, the following advantages of the systems can be highlighted:

1. The control unit is equipped with a special microprocessor that protects the equipment from power surges.
2. The operating mode is supported automatically, there are many settings options.
3. Long service life.
4. Possibility of working on liquefied and natural gas.
5. The boiler continues to operate when the pressure drops to 0.1 bar.
6. In case of problems with gas, the equipment does not freeze. When the temperature drops to +5°C, the burner automatically starts working. If ignition is not possible, the circulation pump operates. Such measures reliably protect the system from freezing.
7. The adjustment is simple and straightforward.

Setting up a Navien boiler

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The relatively young Korean company Navien, specializing in the production of heating and hot water supply appliances for home use, in the shortest possible time, on a business scale, managed to achieve a leading position in the world market in its field. Founded in 1978, today the company has official representative offices in the USA, Canada and China.

The range of products presented by Navien is quite wide, but the main devices that are most popular among buyers are:

• gas boilers
• water heaters
• radiators

In addition to the excellent quality of its products, the company can responsibly declare the lowest prices, which sufficiently suits Russian consumers, in particular in the cities of Moscow and St. Petersburg.

By using the services of highly qualified specialists when ordering their services on the YouDo website, you will receive professional performance at fairly low prices for such important work as:

• dismantling the old boiler
• chimney preparation
• sewerage installation

Upon receipt of permission from special services, the Navien gas boiler will be configured.

Features of setting up gas boilersNavien

With the exception of small nuances, the process of setting up a Navien gas boiler is practically no different from installing a conventional electric boiler. However, specifically for gas boilers, the mandatory conditions are:

• obtaining permission to carry out work from gas services
• providing the premises with access to fresh air
• thorough check of the chimney

Our prices

What to do if the aspirated air leaks?

For the Atmo model range with an open (atmospheric) burner, the primary heat exchanger is made of copper.

The appearance of a leak is almost always associated with its destruction. Purchasing a new heat exchanger is not an easy and expensive task, so most often the issue is solved by soldering the fistula.

To carry out repairs, you should contact a technician from the service center, since this requires a qualified specialist who can dismantle the unit, find the fistula that has arisen, solder it properly, simultaneously rinse the heat exchanger and install it in place without damage.

The work is complex and requires the participation of a trained person.

Do-it-yourself replacement of units

Some units and components are replaced or cleaned independently. It is recommended to order and purchase spare parts from Navien dealers.

Before opening the lid, it is recommended to disconnect the boiler from the water, gas and electricity supplies. Here are some examples of replacement.

To replace the fan, and it is only replaced as an assembly, you should:

• Disconnect the gas line.
• Remove the hose between the fan and the air sensor.
• Disconnect the connectors (there are two of them) connecting to the control unit.
• Unscrew the screws (3 pcs.) and pull out the fan. Next, install a new one and return everything to its previous state in the reverse order.

In the video you can see how to flush the Navien boiler:

If you change the main heat exchanger, then you need to do it as follows:

• First remove the following units - gas supply pipeline, ignition transformer, fan and overheating sensor.
• Then disconnect the grounding, unscrew the fastening screws and remove the combustion chamber.
• Next, unscrew the mounting screws (8 pcs.) and remove the flue gas collector.
• After this, unscrew the screws holding the combustion chamber cover (9 pcs.) and unscrew the screws connecting the heat exchanger to the combustion chamber body (6 pcs.)
• Pull out the heat exchanger and install a new one, performing the steps in reverse order.

If the heat exchanger is cleaned and there is no damage, then use the old one. But be sure to check the integrity of the ceramic seal. If necessary, it is changed.

How to properly adjust and start

Procedure:

• The boiler startup procedure begins with filling with water. Gas dual-circuit units do not need to install additional devices, so you just need to open the make-up valve and increase the pressure to 1.5-2 At.
• After this, the valve is closed, air pockets are removed from the system and on the unit itself, for which Mayevsky valves on the radiators and an air valve in the boiler are used.
• Then you need to bleed the air from the circulation pump. The casing is removed and the water heating controls are turned on. Specific sounds appear, indicating the operation of the system. On the pump, gradually unscrew the screw in the middle until water appears. This procedure must be done 2-3 times, after which the air from the pump will be completely removed.
• As soon as the circulation pump is brought into operation, the burner will start electronically and the heating system will begin to function.

This completes the initial startup and adjustment procedure.

Troubleshooting

Let's look at how to fix the main problems with a gas boiler. If error 01 occurs, you need to carefully inspect the pump, check the condition of the impeller and electrical unit, clean the dirt filter, and also remove air from the system.

To eliminate error 02 of the Navien boiler, perform the following steps:

• bleed air from the system;
• measure pressure;
• check the resistance on the pump coil, make sure there is no short circuit;
• check the position of the distribution valve, open if closed;
• clean the sensor flag.

Basic error codes and their interpretation

Let's look at what error codes may appear on the unit display:

The appearance of most errors is accompanied by a shutdown of the boiler, which is dangerous in winter, so you should respond to them as quickly as possible.

Connecting Navien gas boilers in Mozhaisk

Maintaining optimal temperature in a private home is an important task facing its owner. Most often, owners choose gas boilers as durable and reliable suppliers of heat in the house. Before purchasing this equipment, it is worth deciding on the tasks that the heating system will have to perform. In this case, the help of professionals will not hurt.

Request a call Annual service

Experienced and competent employees work here. Craftsmen very often go out to service country cottages, so they are familiar with the operating principle of any equipment. Increasingly, owners of their own homes are inclined to choose Navien gas boilers.

This is a very practical option from a Korean manufacturer, which pleases with its optimal price. At the same time, this model is not inferior in characteristics to similar devices assembled in Europe. From our own experience, we can say that this is a good option for heating country houses.

How to install a gas boiler

If you have already purchased a gas boiler and it has already been delivered to your home, you need to immediately solve the problem of installing it. Navien heating equipment pleases its customers with its characteristics:

• Very easy to use;
• There is no need for additional operating costs;
• Minimum design intervention required;
• Heating efficiency is achieved with ease of adjustment.

The installation of heating devices entails a number of features. Modern systems are distinguished by a beautiful design and a built-in automated system, which in no case can be damaged during the installation process. That is why it is better to immediately seek help from experienced specialists.

We employ only professionals in their field who have been specializing in comprehensive maintenance of country cottages for many years.

After carrying out all the necessary installation procedures, our workers will be sure to familiarize the homeowner with the operating instructions

This is a very important condition for the productive and smooth operation of the entire mechanism. Navien gas boilers even have automated programming functions. You set up the system once - and then everything functions even in your absence

You set up the system once - and then everything functions even in your absence.

Features of connecting a gas boiler

Masters know firsthand that connecting gas boilers is the most difficult and responsible process. Therefore, we do not recommend carrying out this procedure yourself. You obviously can’t do this without special knowledge and well-developed skills. We quickly install the boiler itself, connect the heating circuit, connect the heating system and finally connect it to the gas pipeline. Our specialists have all the permits to work with gas equipment.

To solve your problem, you can call a specialist. Fill out the form, briefly describe your problem and we will call you back for a consultation.

Request a call Annual service

Why us?

• Our service technicians have extensive experience and high qualifications.
• We will eliminate any problem in the operation of the Navien boiler.
• We service and repair gas equipment of all models.
• Fast, cheap, reliable.

You just need to dial our number, by phone or fill out a request on our website, and our specialists will advise you on any questions you are interested in, be it repair or maintenance of the boiler.

And most importantly, we save your time, money and ensure the safety of your home.

• Flushing the Navien boiler heat exchanger
• Navien boiler board repair

Causes of malfunctions

To solve a problem with a gas boiler, you do not always need to contact a service center. Most often, errors occur due to three factors:

• ignition does not function;
• problem with the coolant;
• no fuel supply.

Before planning to call a technician or calculating the cost of repairs, it is worth looking for the cause of the specified malfunction. There may be a failure of the signal indicating the normal flame level in the system igniter. Other possible faults:

• the ionization sensor has failed;
• the gas supply valve is closed;
• errors in the operation of the grounding circuit.

There are several factors for the occurrence of errors in the boiler.
It is best to start the inspection with the flame sensor. The part must be clean and must not be allowed to contain deposits or dirt. If there is contamination, you need to clean the sensor and then try to turn the system back on. It is also necessary to check the grounding connection and the position of the valve at the gas inlet to the equipment.

Prices for repair of Navien heating boilers

The website shows approximate prices for boiler repairs at home.

You can find out the exact cost of repairs only after a detailed inspection of the heating system.

It will depend on the following factors:

• complexity of work;
• Type of equipment;
• gas boiler brand;
• scope of work.

Call and order gas boiler repair.

We care about our customers, so we will do everything to keep you warm even on the coldest day!

Gas boiler Navien Deluxe 10k - review after 3 years. Identified pros and cons.

The choice in favor of the Navien DeLux 10K gas boiler in our house was made not by us, but by the developer of the cottage community in which we live. That’s why we got it from the very beginning, new, like the house itself.

I would prefer another brand of boiler, with a more successful design (for example, Proterm Gepard). I’ll tell you why later. But in general, we must conclude that the Navien showed its best side in operation and, on the whole, did not disappoint.

Power and area of ​​the house

According to the technical data, the double-circuit gas convection boiler “Navien DeLuxe 10K” with a power of 10 kilowatts is designed to provide a heating area of ​​100 square meters. Efficiency – 91.2 percent.

Double-circuit means that the boiler heats the house and provides its residents with hot water.

Naturally, we initially had big doubts that the boiler’s power would be sufficient to efficiently “pump” the entire house with heat (total area - 130 square meters). But, fortunately, they were not justified at all. Firstly, because we live in the very south of the European part of Russia, and insulation - polyurethane foam - is pumped into the space between the brickwork.

Secondly, because immediately after connecting the gas, the same master with whom we entered into a contract for servicing the gas boiler, for a small fee, reconfigured the Naviena DeLux 10K to operate with twice the power.

And even during periods of prolonged frost, the boiler easily copes with ensuring a comfortable temperature in the house. Boiler installers shared that Naviens of various brands already occupy more than half of the total volume of all boilers in their practice. Due to its price, I guess.

First about the pros

• Navien is inexpensive compared to many other models. I suspect that this factor became the most decisive for our developer when he made his choice of a gas boiler.
• The boiler is very compact, weighs little, requires very little space for placement - in a corner, on the wall.
• Insensitive to changes in water and gas pressure; short-term power outages. It also works quietly on low gas (which is not uncommon in new villages). Even in the hottest summer period, when everything is diligently watered and the water pressure drops noticeably, the boiler works properly, continuing to regularly provide hot water.
• Economical! This is definitely a big plus for Navien: gas bills are very pleasing and don’t break any holes in the family budget.

Ineffective smoke removal system. In the already mentioned “Proterm” it was done much more competently: it is a pipe of a smaller diameter inserted into a pipe of a larger one. One pipe is “in”, and the other is “out”, and everything is simple, civilized and good! In “Navien” there is an ugly corrugation at the top. If you hang the cauldron in the kitchen or in some other prominent place, you will have to rack your brains about how to “drape” it.

Within a year, water began to leak through the make-up tap; I had to change it. Another year and a half later, water began to ooze along with air through the auto-air vent. The primary heat exchanger did not last up to three years. The repair is not very expensive, but I would still like greater durability of the components and parts. A little noisy when working. When operated in heating mode, the gas burner switches on/off quite often, and this action is accompanied by quite noticeable noise. If the boiler hangs in a practically non-residential room, such as a “boiler room” or “storage room” (like ours, for example), then this, of course, is not important and does not cause any inconvenience. But whoever has it hanging in their kitchen, I don’t think it’s very nice. Therefore, I definitely list this property as a minus.

In general, our Navien DeLux 10K boiler has been performing its functions well for three years. Its heating cycles are fast, the supply of hot water is always stable, and it is economical and energy efficient.

But this version of the boiler, of course, does not reach five points. And above all, due to the insufficient reliability and durability of its parts.

In general, the “service life” of a gas boiler is an elastic concept. After all, the body does not break, and components and parts can be changed even ad infinitum. Four points out of five, “Navien DeLuxe 10K” is one of the successful budget versions of a gas boiler.

Double-circuit means that the boiler heats the house and provides its residents with hot water.

Boiler malfunctions

All modern boilers, regardless of the type of power supply and method of connection to the heating system, have approximately the same design and structural modules similar in purpose. Therefore, we can consider general cases of boiler failure and repair, without paying attention to their type. In these identical situations, independent intervention is possible. In specific cases, qualified service is required.

Different boilers, depending on the version, include all or some of the following modules:

• Power supply system and its supply.
• Controls.
• Protection systems.
• Automatic operation control unit.
• Connection system to the heating system.
• The boiler itself and its actuators.

Practice constantly confirms the theory that any, even the highest quality equipment is not insured against breakdowns during operation, especially during the heating season. Heating boilers are no exception. The main reasons for their failures are as follows:

• Poor design and installation of the system.
• Incorrect operation.
• Damage to shut-off valves.
• The pressure in the heating system is lower than specified.
• Heat exchanger contamination.
• Triggering of the draft sensor due to a clogged chimney.
• Solenoid malfunction.
• Power supply failure - a drop in gas pressure at the boiler inlet, a decrease in network voltage or its absence, etc.

In accordance with reliability theory, operational failures leading to repairs are classified for boilers according to several criteria.

Classification of breakdowns

• Intermittent and final. Intermittent failure is one of the most difficult to diagnose. It appears when any parameters go beyond the required range. For example, when the mains voltage drops to 160-170 V, most gas heating boilers stop starting, and after the voltage is restored to 180-220 V, the system resumes operation.
• Secondary and primary, dependent and independent. The name speaks for itself. A secondary failure will certainly occur with a primary (independent) one, and for a dependent one, the probability of its occurrence with a primary (independent) one only increases.
• Gradual and sudden. The former arise during operation and are a consequence of wear of structural elements, accumulated fatigue of materials and changes in their properties. Sudden failures occur unexpectedly, without any apparent reason for their approach, and are characterized by an immediate cessation of operation.
• Non-obvious (hidden) and obvious (explicit). These failures differ in ease of detection - identifying a leaking heat exchanger is much easier than changing the parameters (capacitance) of the condenser.

If the boiler begins to heat water longer than usual, and its operation begins to be accompanied by extraneous sounds, or if other visible signs of malfunction appear, immediate diagnosis and repair are necessary. There is no need to wait until the unit fails completely - if repairs are not carried out in a timely manner, the boiler will eventually stop working.

Such signs may indicate the beginning of a malfunction of the heating element, possibly due to improper use of the boiler or its overload. But there may be other reasons.

Error 16 - what does it mean?

According to the instructions from the manufacturer, error 16 on the device display may appear in one case - overheating of the heat exchanger. If such a process occurs, the emergency thermostat immediately transmits a signal to the electronic board and the boiler turns off. Overheating can be caused by a lack of coolant or its slow movement along the heating circuit.

What can be done at the initial stage

If error 16 appears on the display, it is not necessary to immediately call a technician. You can try to deal with the problem yourself. To get started, take the following steps:

1. The boiler must be allowed to cool. But he must do it himself and gradually. You cannot “help” with antifreeze. The overheating sensor is activated when the temperature reaches +85 degrees, but as soon as it reaches +95, the unit is blocked. After the boiler has completely cooled down, you can try to restart it using the “On/Off” button. If the appearance of error 16 was caused by a power failure or the sensor itself gave a false signal, the problem will be resolved.
2. Check the pressure. The heating circuit should normally be 1.5 bar. If for any reason it is lower, bring it to this indicator yourself.
3. Check signal circuits. Error 16 in a Navien boiler can be the result of a short circuit in the wires, their breakage, or burnout. During diagnostics, you also need to pay attention to the condition of the contacts.

If all these three methods have been tried, but there is no result and error 16 is still displayed on the display, then the problem is in the boiler itself or the heating circuit.

Navien boiler remote control

Types of wall-mounted boilers

Atmospheric gas boiler NAVIEN ATMO 24-AN

There are three types of wall-mounted heating devices of this class on the domestic market:

• Navien atmospheric (open) boiler;
• turbocharged wall models;
• condensing devices.

Each of these positions requires separate consideration.

Atmospheric gas boilers

Units of this type have an open combustion chamber. Represented by the Navien Atmo model. It is intended for operation in conditions of uneven gas pressure (its differences can reach 8-17 mbar) and the coolant itself - from 0.6 to 8 bar. The power of the offered units varies from 13 to 24 kW. At an operating temperature of 80°C, the coolant heats hot water to 60°C with a production volume of 10 liters per minute. To remove combustion products, they are equipped with standard chimneys.

The heating circuit in atmospheric boilers is made of copper, and the heat exchanger body is made of stainless steel.

Turbocharged units

Turbocharged boiler Navien Deluxe 10 Coaxial

The group of units of the second type (with an isolated combustion chamber) includes models of the following series:

• Prime, represented by boilers with a capacity of about 13-35 kW;
• Deluxe, whose declared power ranges from 13 to 40 kW;
• modern Smart TOK models with an indicator of 13-35 kW.

Portions of air are forced into the isolated combustion chamber - they are pumped through a special fan installed in a coaxial pipe. Thanks to this, units with a Coaxial design have a higher efficiency, sometimes reaching a record figure of 93%. Gas boilers from the Navien Deluxe series are able to withstand significant changes in supply voltage, as they are equipped with a built-in stabilizing device. In addition, they have the option of automatically maintaining the temperature of the media at a level not lower than the “cooling point” (6-9 degrees).

Condensing boilers

Condensing gas boiler Navien NCN 40KN

The third type of Navien gas boilers is represented by samples of equipment from the NCN and NCB series. Due to additional heating of the carrier with the heat of the condensate, their efficiency was increased to 99%. The functionality of these units is even higher than that of turbocharged boilers - the controller built into them allows you to set temperature parameters for a week in advance.

The Navien NCN product series includes four varieties with power from 22 to 40 kW, and NCB has the same number of products with ratings of 24-40 kW. The water in them is heated to 65°C, and the coolant circulating through the pipes is heated to 90°C. These units are able to withstand media pressure up to 10 Bar.

The air supply in equipment of this class is organized through a coaxial or conventional chimney.