Mounted boilers navien. Double-circuit gas boiler "Navien. Characteristics of the Navien Ace range of wall-mounted heaters

Offered by our stores today is very wide. Choosing the most suitable model in terms of reliability and quality at the lowest price is a very difficult task. Among the manufacturers of such equipment, the South Korean company Navien is not the last. To give the potential buyer the necessary information about what the Navien gas boiler is, and is the purpose of this article.

What is the principle of operation of Navien boilers

The operation of Navien boilers is based on the same principles as those of similar devices from other manufacturers.

Composition and types of boilers

The structure of each such device includes the following main components:

  • gas stove;
  • gas supply control mechanism;
  • heat exchange device.

In the modification, hot water immediately enters the heating system of the house. models incorporate an additional water heating circuit for the hot water supply system at home (DHW). When this circuit is activated, the heating system is suspended.

Exhaust gas removal

Gas combustion chambers in boilers are open (atmospheric) and closed (). In atmospheric models, smoke leaves the room on its own through the chimney. For turbines, exhaust gases are removed by means of a fan forcibly through a pipe through the outer wall of the house.

Important! In rooms where a gas boiler is installed, permanent exhaust ventilation is required. This is especially important for atmospheric models.

Gas-burners

One of the main components of a gas boiler is, of course, a gas burner. As a rule, modern models are equipped with modulating burners. They allow you to modulate the flame, controlling the gas supply, depending on the need to adjust the temperature of the air in the premises or the water in the DHW system. When equipping the device with an automatically controlled modulating burner, the heating system will accurately maintain the set temperature.

Control and protection systems

When there is a power outage, the gas boiler stops working, when electricity appears, it starts automatically.

In the event of a gas supply interruption, the automation will close the solenoid valve, which will block the possibility of fuel entering the device. In such situations, it is only possible to open the gas supply to the boiler manually.

Modern models have the ability to save energy and protect against freezing. The water temperature is controlled by sensors that automatically turn on the heating of the coolant when its temperature drops to the set value.

Most gas devices, including the Navien wall-mounted gas boiler, include self-diagnosis systems. These systems monitor the operation of all nodes and display on the scoreboard, with the help of codes, information about the problems that have arisen.

Specifications from the technical side

In our market, Navien offers double-circuit wall-mounted gas boilers with the following characteristics:

  1. Combustion chambers of any type - both open and closed.
  2. The power range of the manufactured devices allows you to heat rooms ranging from 30 to 400 square meters. m.
  3. Double-circuit modification makes it possible to heat water for the DHW system.
  4. Heat exchangers are made of stainless steel.
  5. Both liquefied and natural gas can be used to operate boilers.
  6. The amount of water produced for the DHW system is determined by the capacity of the device. For example, a 13 kW device produces water in a volume of up to 11 liters per minute, and with a power of 30 kW - about 17.
  7. The electronic control unit has the function of protecting the device from power surges.
  8. Most models of heating boilers are equipped with a remote control unit with the following features:
    • the unit displays data on the set values ​​of the temperature of heating water, hot water in the DHW system and indoor air;
    • the display shows information about the problems that have arisen in the operation of the nodes;
    • the buttons on the block turn the boiler on and off, set the temperature mode;
    • the built-in air temperature sensor provides information for regulating the gas burner.

The delivery set for each Nevien gas boiler includes an instruction manual that describes in detail the rules for working with the control unit. There are also more detailed technical characteristics of the device.

Mounting Features

Before buying a gas boiler, you must:

  1. Prepare a place for installation. Atmospheric apparatus requires a separate room, at least 2x2 m in size, with exhaust ventilation.
  2. The device must be powered from a stabilizer connected to a circuit breaker or a socket that has an emergency shutdown capability.
  3. The boiler body must be grounded, so you need to bring a ground wire to the installation site.
  4. The wall where the device will hang, if it is flammable, must be sheathed with non-combustible material.

After purchasing the boiler, it is not an easy task to connect it. The factory instruction manual recommends that a specialist from an authorized service center be involved for this.

But if you have the skills to work with pipes and taps, you can try to hang it on the wall and connect the device yourself. The factory manual says it all in detail.

But do not forget that in any case, you will need to call a gas service specialist to conclude a service contract and obtain a special permit for the operation of gas equipment.

Important! Unauthorized connection of gas to the boiler threatens with penalties and even criminal liability.

Advantages and disadvantages of Navien boilers

A careful study of the models of different companies allows us to conclude that the Navien gas boiler has many advantages over competitors' products. Namely:

  • good quality at a relatively low price;
  • a large number of service centers for their maintenance;
  • strict quality control mechanisms are in place at the company's enterprises;
  • heat exchangers are made of high quality stainless steel, which ensures their long service life;
  • the presence of an air temperature sensor built into the remote control unit;
  • protection against power surges;
  • a very large selection of models;
  • cheap spare parts.

Disadvantages are much less:

  1. noises and thuds at work;
  2. Only branded spare parts are suitable for replacing failed parts.

In the Russian market of heating equipment today there are many different types, brands and models of boilers. You can choose them according to various parameters, but if the main thing for you is the optimal price-to-quality ratio, along with high power parameters, then we can recommend Navien heating boilers, which are quite popular today.

Equipment Features

Despite the fact that there are many varieties of Navien boilers, they all have several similar parameters:

  • long service life;
  • high quality workmanship;
  • the presence of a two-circuit system that allows Navien boilers to provide not only heating, but also the supply of hot water;
  • low cost, which is difficult to find from another manufacturer;
  • high efficiency of any Navien boiler, depending on the type of a particular model, but always above 90%.

In addition, all Navien boilers are designed for operation specifically in Russian conditions and can easily withstand both low pressure in the gas supply network and power outages.

Features of choice

If you decide that the Navien heating boiler will be installed in your home or office, you should consider the following characteristics of such equipment to select a specific model:

  • performance, which can be equal to 60 kW (for a Navien diesel boiler), or be at the level of only 13 kW. Thus, you can choose a unit that will provide the most efficient heating of your home, office or other premises without unnecessary energy costs;
  • need for hot water. If you do not need hot water too often, you should pay attention to Navien Ace gas-fired and wall-mounted models. With their help, you can get a flow rate of about 10 l / min, which is enough for the operation of 1-2 water distribution devices (faucets, showers, etc.). A significant amount of hot water for household needs can be provided by the diesel-type Navien boiler, which supplies it with a flow rate of up to 34 l / min.

Purchase of boilers

You can buy a Navien boiler from one of the dealers of this brand in the Russian Federation. For example, in the TeplovodService company, which offers its customers many advantages - from relatively low prices to high-quality service for all Navien boilers. In addition, everyone who decides to buy Navien is issued a branded warranty card that allows them to apply for repairs and maintenance for as long as 3 years.

Navien gas boilers, according to reviews, do not cause problems to their owners during operation. They are made in Korea, but with a focus on our market. The range includes models with a hermetic and non-hermetic combustion chamber, as well as with a condensing heat exchanger. All of them are double-circuit, equipped with programmable microchips and multi-level protection.

Turbocharged boilers Navien Deluxe Coaxial

Deluxe and turbo models differ in the method of connecting the chimney.

The Navien deluxe gas boiler must be hung on the wall, it is double-circuit, the combustion chamber is sealed. This means that it can heat water in two directions at once: heating and hot water. The air for the fire is not supplied from the premises, but from the street through. A turbine is installed above the burner to take in air and exhaust gases. It is powered by the mains and without it the functioning of the boiler is impossible.

This heater is designed in such a way that it can work in our conditions. This applies to gas pressure, the quality of the coolant, and the harsh Russian winters. This unit has a useful feature that prevents the system from defrosting. This option in Navien gas boilers, according to reviews, saved more than one circuit. When the coolant temperature drops to 10 degrees, it automatically turns on. It drives the liquid along the circuit so that it does not freeze. If the temperature continues to fall and reaches 6 degrees, then the boiler turns on and heats the liquid to 21 degrees.

The burner is made of stainless steel. It can be set to turn on and off according to the desired room temperature. The heater easily tolerates:

  • water pressure drop to 0.1 bar;
  • gas pressure drop to 4 atmospheres;
  • malfunctions of the Navien boiler associated with power surges are excluded.

The heaters of this line are produced with a capacity of 10, 13, 16, 20, 24, 30 kW. The power can be adjusted. The boiler heats water for heating in the range of 40-80 degrees, and for hot water 30-60 degrees. To remove the products of gas combustion, a 75/70, 60/100 or 80x80 chimney can be connected to the heater.

Turbocharged boilers Navien Ace Turbo Korea

The filling of the Ace Turbo Korea boiler is no different from the Deluxe Coaxial. That is, both units are dual-circuit, can operate under the same conditions, are equipped with identical systems for maintaining the temperature in the room and preventing defrosting of the circuit. The combustion chamber is also sealed and works in tandem with the fan. Malfunctions of the Navien gas boiler during power surges are excluded thanks to a special chip in the microprocessor.

The operation of a sealed combustion chamber is impossible without a turbine.

There are two modifications with a capacity of 35 and 40 kW. Naturally, such Navien boilers consume more gas according to the instructions. At the minimum power, the consumption is 1.48 m3/h of natural gas, at the maximum power - 4.4 m3/h. In addition, the heater can operate on liquefied gas, in which case the consumption is somewhat less. Main characteristics:

  • Efficiency 91.5%;
  • minimum power 14 kW;
  • minimum water pressure in heating 0.6 atmospheres;
  • the minimum pressure of the DHW system is 0.1 atmospheres;
  • throughput 20.1 or 22.9 l/h depending on power.

For such units, only the FF 75/70 chimney is suitable - this is one of the main differences between this model and Deluxe Coaxial. Heater weight 30 kg. The cross section of the pipes for connecting to the heating system and the central gas pipeline is ¾ inch. ½ inch hot water connection. The installation of the equipment may only be carried out by a specialist with the appropriate level of authorization.

Condensing boilers Navien NCN

Condensing boilers are the most modern type of heaters for heating. The unit is always assembled from the latest components, so its price is not small. The peculiarity of this heater is its high efficiency, which reaches 98%.

The boiler comes with a remote control.

Closed combustion chamber. Due to the special design of the heat exchanger, the unit is able to heat the coolant or water for hot water supply not only with a flame, but also with smoke formed as a result of combustion. The combustion products are not immediately taken out into the street, but pass through a special channel, where they have time to cool down. At the outlet of the heater, the temperature of the gases is low, so even plastic chimneys can be used. By the way, the technical characteristics of the Navien gas boiler allow the use of coaxial chimneys 60/100 and 80/125, as well as separate chimneys 80x80.

Useful options:

  • frost protection;
  • auto diagnostics;
  • programmable microprocessor;
  • remote control with LCD display.

As the smoke cools, condensation occurs. It is collected in the boiler and when its volume becomes critical (about 250 ml), the condensate is simply thrown out through a special pipe. A sewer pipe must be connected to this pipe.

From the remote control, you can send commands to the boiler in manual mode, or you can program it to maintain the temperature in the room. In this case, the remote control performs the function of a remote temperature sensor. The condensing heating boiler Navien is available with a capacity of 25, 32 and 40 kW. The package includes a circulation pump and 6.5 liters. All modifications run on natural and liquefied gas. The minimum power for heating is 4.9 and 7 kW, for hot water supply - 4.8 and 6.8 kW. The operation of the heater is possible only if the pressure in the DHW system is at least 3 atmospheres.

Atmospheric boilers Navien Ace Atmo

The peculiarity of this line lies in the open type combustion chamber, into which air enters directly from the room where the unit is installed. All models are double-circuit, power 13, 16, 20, 24 kW. A processor is installed in the boiler, which prevents the system from defrosting, protects against power surges and pressure drops in the heating, hot water and gasification system.

Gas boiler Navien 24 kW specifications:

  • Efficiency 86%;
  • minimum power for heating 9 kW;
  • minimum water pressure 0.1 bar;
  • minimum DHW pressure 0.6 atm.

For such boilers, a chimney with a cross section of 130 mm is required. The diameter of the pipes for heating is ¾ inch, and for hot water and gas ½ inch. The unit runs on natural and liquefied gas. This is a volatile device that consumes 110 W / h.

It is difficult to choose a suitable gas boiler - the huge range of models for sale affects. Even within a single manufacturer, the number of units can be overwhelming. In order to make the choice easier, you should look at models from eminent developers. For example, the Navien gas boiler, created by the Korean company of the same name, will be an excellent solution. Let's see what kind of boilers they are, why they are remarkable and why consumers choose them.

Heating gas boilers Navien are manufactured using the manufacturer's own developments, which increase the efficiency of the equipment and its economy, as well as facilitate easier operation. All this helps to create equipment that is ideal for organizing autonomous heating. Let's make a list of features and advantages of Navien gas boilers:

  • Intelligent remote control - implemented in the advanced Smart Tok line;
  • The presence of modulated burners - provides silent ignition, smooth temperature control in the circuit and a reduction in thermal load on internal components;
  • Voice prompts - Navien gas boilers are endowed with voice guidance systems, which makes control even more convenient;
  • Adaptation to Russian working conditions - stable operation with gas fluctuations;
  • Self-diagnosis - allows you to quickly get information about errors and failures.

In other words, the Korean manufacturer Navien managed to assemble decent equipment for autonomous heating systems.

Heating equipment specialists give Navien gas boilers a positive assessment, noting the low number of breakdowns, the endurance of burners and heat exchangers, and the long service life of the equipment.

The range of heating equipment includes the following models:

  • Double-circuit wall-mounted turbocharged;
  • Double-circuit wall atmospheric;
  • Wall double-circuit condensing;
  • Floor gas single-circuit;
  • Floor gas double-circuit.

The most popular are Navien wall-mounted gas boilers, represented by a large assortment of models.

Popular Models

The time has come to consider the most popular models of Navien gas boilers, in demand among domestic consumers. It is they who deserve the highest ratings from users, providing them with warmth.

The double-circuit gas boiler Navien ATMO 24AN is made according to the traditional convection scheme and is equipped with an open combustion chamber. With a power of 24 kW, it can warm up to 240 square meters. m. of living space, spending up to 2.47 cubic meters. m / h (this is the maximum figure). The DHW capacity reaches 13.7 l/min. The primary heat exchanger is made of copper, the secondary heat exchanger is made of durable steel. If necessary, the device can be reconfigured to work with liquefied gas.

For more convenient control, remote controls with built-in thermostats are connected to the unit (such a remote control is supplied). Inside them, all the necessary piping is provided - these are expansion tanks and circulation pumps. The estimated cost of equipment varies between 23-26 thousand rubles.


Before us is a mounted boiler Navien, created on the basis of a burner with a closed combustion chamber. Unlike the previous model, a clear minus catches the eye - this is a steel primary heat exchanger. If we analyze the reviews of experts, we can find out that copper heat exchangers are the most stable and easy to repair, but equipment with them is more expensive. The power of the presented unit is 24 kW, the capacity of the DHW circuit is up to 13.8 l / min. It is electronically controlled with a diagnostic system and a room thermostat. The efficiency of the device is 90.5%, the cost is 24-26 thousand rubles.


In the line of equipment from Navien, this unit is the most advanced. It is endowed with a closed combustion chamber, an electronic control system, a remote control, a control option via the Internet, a self-diagnosis system, a programmer for operating modes, built-in piping and an outdoor temperature sensor. In other words, this is the most stuffed device from the Korean Navien. Thermal power is adjustable in the range from 8 to 24 kW, the performance of the DHW circuit is up to 13.8 l / min. The efficiency is 91%, the maximum gas consumption reaches 2.79 cubic meters. m/hour. It is possible to operate the device on liquefied gas.

Owner reviews

Before you buy a good gas boiler from Navien, it would not hurt to study the reviews of already established users. They will point out weaknesses and help to give a preliminary assessment of certain models.

Gas boiler Navien DELUXE 24K

Alexei, 29 years

The boiler was chosen for a long time - before we settled on Navien, we re-read a bunch of reviews and reviews. After numerous consultations with sellers and heating specialists, we settled on this model. All the same specialists were engaged in the installation, he did not dare to do anything. The first winter was successful, there were no breakdowns during operation. Very convenient control - the remote control was placed next to the sofa in the living room. You set the temperature, and the unit standing in the kitchen independently maintains the required mode.

Advantages:

  • Compactness - compared with some other devices, in particular, from Proterm. As a result, the Navien Deluxe boiler turned out to be thinner;
  • Low noise level - a couple of times in winter we visited neighbors and heard how their boiler from Baksi was working, rattling and howling with a fan;
  • The quick achievement of the set temperature is important after our long business trips, when you enter the house and want to quickly feel comfortable.

Disadvantages:

  • The absence of controls on the gas boiler itself, as is implemented in other heating units - in this, specialists from Navien made a mistake;
  • Sometimes there is not enough DHW performance - two open taps lead to a decrease in temperature.

An excellent device with minor imperfections (like everyone else, probably).

Gas boiler Navien DELUXE COAXIAL 24K,

Stepan, 37 years

I never trusted modern double-circuit gas boilers, and my instinct was fully justified. Friends persuaded me to take a model from Navien, they say, it works perfectly and is inexpensive. I was just finishing the construction of the house and urgently needed heating. I took a double-circuit, and after a year and a half I began to count the number of breakdowns. Not the most reliable device, so I can not advise anyone to buy it. If we are already doing heating, then we need to install an ordinary floor single-circuit with an indirect heating water heater - it will turn out inexpensively and quite reliably.

Advantages:

  • It maintains the temperature of hot water well - perhaps this is the only truly positive feature of this gas boiler from Navien;
  • No need to buy a harness - everything is already provided inside;
  • Self-diagnosis can show errors and failures.

Disadvantages:

  • The heat exchanger was probably made of foil, since it was the first to fail. They called the master, he shook his head and said that stainless steel is nonsense, that it was necessary to take a boiler with a copper heat exchanger;
  • One of the buttons on the remote control quickly failed;
  • The gas boiler from Navien often shows errors that are not actually there - probably the electronics are buggy.

Gas boiler Navien GST 35KN

Olet, 57 years old

For my country house, I purchased a powerful 35 kW floor-mounted double-circuit boiler. This choice was quite obvious - I trust full-fledged floor units more than densely arranged wall modifications. I was not mistaken in my choice - the gas boiler pleased me with trouble-free operation, the Koreans did a good job. And the performance of hot water supply here is impressive, up to 22.1 l / min - not a single wall-mounted sample can boast of such a characteristic. The unit is located in the basement, from which a control panel with a room thermostat rises to the first floor.

Advantages:

  • It is convenient to program the operating modes for the week ahead. Since I am in the city on weekdays, the device operates in anti-freeze mode, saving money in my wallet. By Friday evening, he begins to fill the house with warmth, so my family and friends come to an already warm home;
  • Nothing prevents you from simultaneously opening hot water taps in the shower and above the kitchen sink - there is enough performance for all points of water intake;
  • It can run on liquefied gas, it helped out a lot in the first year, then a gas pipeline appeared in the village.

Disadvantages:

  • For the first year, the Navien gas boiler stood in a small boiler room on the ground floor, but then it had to be moved to the basement - it makes a noticeable noise;
  • Frequent switching on and off of the burner - reacts literally to the smallest temperature changes;
  • It took almost a week to start the boiler and set it up - the specialists said that the logic of this device is not the most understandable.

Despite the flaws at the very beginning, further use goes without problems.

Gas boiler Navien SMART TOK 24K

Arkady, 61 years old

The time has come to make a major overhaul in the house, at the same time we decided to modernize the heating system. They threw out all the old pipes, installed modern bimetallic batteries, and at the same time changed the gas boiler by buying a double-circuit Navien with remote control. I was very pleased with the ability to control heating at a distance - I have a program with regulators on my smartphone, it works wherever there is Internet access. The thickness of the case is only 29 cm, so it does not stick out against the background of kitchen cabinets. Works faithfully and flawlessly.

Advantages:

  • In my opinion, this is the most thoughtful gas boiler - specialists from the Korean company Navien did a good job to give consumers an excellent heating unit with advanced remote control;
  • It is possible to control the climate in the house depending on the outside temperature. Programming is also provided, but I haven’t had a chance to use it yet (maybe we’ll try it on our next vacation);
  • No need to buy a pump and a tank - everything is already inside, without taking up space.

Disadvantages:

  • In the very first thunderstorm, the electronics burned out - as it turned out, in gas boilers (of any manufacturer, and not just from Navien), this is the most flimsy place. I had to put additional protection;
  • It took a long time to deal with the intricacies of control - in an effort to make the device very flexible in settings, the developers endowed it with a huge number of various adjustments (often not very necessary and not the most understandable);
  • You can’t repair it yourself - this is not a technique that you can handle with your own hands.

The gas boiler from Navien pleased with its automation, and you can not pay much attention to the shortcomings. The main thing is to protect the electronics from electrical overloads.

Video

Korean wall-mounted double-circuit gas boilers Navien today are the best option when buying, given the sharp rise in price of all imported heating equipment. Of course, the increase in the price of gas boilers affected all manufacturers, but you must admit that it is one thing to pay 30-35 thousand rubles for a boiler, and another to buy it for 50-60 thousand.

Is it worth overpaying, in fact, for the same thing, only made in Italy or? Good build quality, reliability, customer reviews and, most importantly, low price have made the Navien brand very popular in Russia in recent years.

In this review, we will try to understand the models of Navien boilers on the Russian market, their differences, device and technical characteristics, as well as the advantages and disadvantages of boilers of this brand.

Features of models of gas boilers Navien

In the Russian market, the company sells double-circuit wall-mounted gas boilers, both with forced draft (turbocharged) and natural (atmospheric). They are designed for heating a house with a total area of ​​30 to 400 m2, depending on their capacity.

All models are double-circuit, which makes it possible to use them for heating household running water for domestic needs. They can operate on natural and liquefied gas.

Gas boilers Navien Prime and Navien Deluxe

The performance of hot water also depends on the power of the gas boiler. The higher its power, the more water it will give you. Boilers with a capacity of 13 kW produce 10-11 liters of hot water per minute, from 16 kW to 24 kW - 14 l / min., from 30 kW - about 16-17 liters. In practice, it has been proven that for a good supply of hot water to a family of several people, a capacity of 14 l / min is quite enough.

Turbocharged boilers are represented by a wide power range from 13 to 40 kW. The number in the abbreviation indicates the thermal power of a particular wall-mounted boiler model.

In stores you can find the following models:

— Navien Deluxe 13k;
— Navien Deluxe 16k;
— Navien Deluxe 20k;
— Navien;
— Navien Deluxe 30k;
— Navien Deluxe 35k;
— Navien Deluxe 40k.

Boilers Navien Deluxe Coaxial - Specifications

Table of technical characteristics of Navien Deluxe Coaxial boilers

In addition, turbocharged (with a closed combustion chamber) double-circuit gas boilers of a Korean manufacturer differ in the type of output of combustion products and air inflow.

They are of two types:

- with a coaxial chimney;

- with a separate chimney.

Boilers Navien with a coaxial chimney are labeled Deluxe Coaxial. In previous years, a 24 kW turbocharged boiler was designated as Navien Ace 24 E. Where the letter "E" meant "Euro", i.e. European type of chimney pipe.

A coaxial chimney is a pipe-in-pipe chimney. Air flows into the boiler from the street through the outer pipe, and combustion products are ejected through the inner pipe. The diameter of these pipes is 60/100 mm, which is also indicated in the instructions.

For those situations, if the installation of a gas boiler is impossible according to the project, practical and cunning Koreans came up with a boiler with the possibility of installing the so-called separate chimney.

This type of turbo-boiler is already equipped with two pipes for connecting: the first pipe, which ejects combustion products, and the second one for air suction. Instead of the second pipe, you can also put aluminum corrugation, it is cheaper. The nozzle diameter is 75 mm and 70 mm, respectively.

This type of boiler is marked with the letter "K", i.e. Korean version of the chimney. For example, if you see the designation Navien Deluxe 16K on the price tag of a boiler in a store, this means that you have exactly this type of Korean-made double-circuit gas boiler. See photo below.

When choosing a boiler, also keep in mind that boilers with a Korean version of the chimney are produced with a maximum power of up to 40 kW inclusive, while with a coaxial pipe - only up to 30 kW.

Boiler Navien Deluxe 24K with channel separator

Line of gas boilers Navien with open combustion chamber represented by models with a capacity of 13, 16, 20 and 24 kW for space heating from 30 to 240 m2. They are marked Navien Ace 13-24 A.
The symbol "A" tells us that this device is atmospheric, and the numbers - about its power. On boilers of this type there is no fan (turbine), and the output of combustion products occurs by natural draft.

An atmospheric boiler can be purchased if your home already has a chimney, such as asbestos-cement pipes, sandwich pipes, or brick pipes. It will simply be necessary to purchase separately pipes made of steel (preferably stainless steel), and lead them into an existing chimney.

The diameter of the nozzle on the boiler is 130 mm. This is important to remember, because it is impossible to narrow the chimney.
And, if, for example, you have an asbestos pipe with an inner diameter of 100 mm, then it will have to be replaced with pipes of a larger diameter. Otherwise, the boiler will not work correctly and will quickly fail.

The device of double-circuit gas boilers brand Navien

Like most modern double-circuit wall-mounted gas boilers, South Korean-made boilers are equipped with:

The device of a double-circuit gas boiler Navien Deluxe Coaxial

- the main heat exchanger for heating water in the heating system;
- secondary heat exchanger for heating hot water;
- circulation pump;
— membrane expansion tank;
- electronic board ("brains" of the boiler);
- burner assembly;
- safety group (air and safety valve, pressure gauge, sensors);
- a three-way valve for switching the operation of the circuits;
- turbine (for versions with forced draft).

Design features of double-circuit boilers Navien

1. Navien boilers have two separate heat exchangers: one for heating, the second for running domestic water. An important feature is that both heat exchangers are made of stainless steel.

Then, like most competitors, only the secondary heat exchanger is made of stainless steel, and the main one is made of copper, or there is only one bithermic copper heat exchanger for heating both circuits. Stainless steel in itself guarantees a long service life of a gas boiler.

2. Another important point is that the company produces all the elements of the boiler itself. Both the pump and the membrane tank and heat exchangers are produced in South Korea. Unlike, say, many others, in which parts from different manufacturers are often installed.

3. The electronic board of the Navien boiler has a special built-in chip to protect against power surges. The same protection of the "brains" of the boiler is provided only on wall-mounted gas boilers made in Germany, but the heating equipment of this brand belongs to a different price category.

But, despite this chip, experts still recommend buying it, given our Russian realities, when the range of power surges in the mains can be quite decent.

4. And finally, the most noticeable distinguishing feature of Korean manufacturers is remote boiler control unit Navien. This is such a special "box" that has a digital display and buttons for controlling the operation of the boiler.

Boiler control unit Navien

The display shows information about any malfunction and error during the operation of this equipment, the set temperature of water, coolant, air, as well as time. Using the buttons, the operation parameters are manually set: mode, temperature, turning the boiler on and off.

A very important point is the presence in the control unit of a built-in room temperature sensor. Usually, from other manufacturers, this sensor is considered as an additional option, and is purchased for a fee.

The "Koreans", however, it comes with a boiler. And you don’t even need to buy wires: they are already on the boiler and on the block. The difference is made by boilers of the series Navien Prime and Navien Deluxe Plus. The control unit here is built into the body of the device and, as a result, there is no ambient temperature sensor.

Connection and installation of the Navien boiler

Like all wall-mounted double-circuit gas boilers, the "Koreans" have 5 fittings at the bottom of the body for connecting water and gas. The order of fittings from right to left: gas connection, running water inlet and outlet, coolant inlet and outlet.

The diameter of fittings for domestic water is 1/2 inch, gas and coolant 3/4 inch.
Be sure to install on each supply pipe.

Between the boiler and the wall on which it will hang, it is necessary to install a stainless steel protective screen measuring 1000 by 600 mm for fire safety purposes. Also, for the correct installation of the boiler on the wall, a special mounting plate is included in the package.

Connecting the gas boiler Navien Deluxe Coaxial

Advantages of Navien boilers:

— good price-quality ratio;
- two stainless steel heat exchangers;
- the presence of a remote control unit with a built-in air temperature sensor;
- the presence of a protective chip against a power surge;
- a wide range of models and colors;
- cheap spare parts.

Disadvantages of Navien gas boilers:

- noise during operation;
— Fit only native spare parts;
is an Asian brand.

So, we reviewed the range of Korean wall-mounted double-circuit gas boilers Navien, their differences, dismantled the external and internal structure of the boiler. Watch a video review of the boiler.

Looking at the technical specifications, as well as reviews of owners and specialists, Korean-made Navien boilers are perhaps the best for choosing heating equipment today, if we take into account such a parameter as price-quality. In general, this is a very worthy and inexpensive device for a modern heating system in your private home.

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