What is a gas double-circuit boiler Navien (Navien) + technical characteristics and user reviews

For owners of private houses, the issue of heating and hot water supply is especially acute.

The housing area is large, the cost of paying for network resources is quite high.

If there is no connection to central heating and hot water supply, there is a need to create an autonomous heating system.

A successful solution to the issue is to install a Navien gas boiler, which can solve all problems at once and create a cozy and comfortable environment in the house.

Let's take a closer look at this option.

Double-circuit boilers from Navien

KyungDong NAVIEN is a well-known industrial concern from South Korea. The company specializes in the development and production of heating systems, equipment for heat and water supply to private homes.

The company's product range includes various types of heating units using all existing types of fuel.

Navien double-circuit gas boilers are capable of heating a home and at the same time providing it with hot water.

The equipment requires certain conditions to operate:

• Gas supply (natural or liquefied).
• Coolant and water supply.
• Connection to the electricity network.

The main feature of Navien boilers, which played a decisive role in their spread throughout Russia, is the adaptation of the units to difficult operating conditions. They calmly tolerate changes or low values ​​of water and gas pressure, and are able to independently compensate for fluctuations in mains voltage within 30% of the nominal value (230 V) .

The climatic features of Russia are taken into account - when the coolant temperature drops to 10°, the circulation mode switches on automatically, when the coolant begins to actively move through the system.

This prevents the liquid from cooling and freezing.

NOTE!

Navien boilers are 2 times cheaper than European equipment of the same class and power. Considering this circumstance, the popularity of the Korean company’s products is understandable.

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Korean wall-mounted double-circuit gas boilers Navien are by far the best option when purchasing, 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, it’s one thing to pay 30-35 thousand rubles for a boiler, and another thing to buy it for 50-60 thousand.

Is it worth overpaying for essentially the same thing, only made in Italy or Germany? 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 Navien boiler models presented on the Russian market, their differences, design and technical characteristics, as well as the advantages and disadvantages of boilers of this brand.

Features of Navien gas boiler models

On 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 power.

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

Gas boilers Navien Prime and Navien Deluxe

The productivity 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 power 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 to provide a good supply of hot water to a family of several people, a capacity of 14 l/min is sufficient.

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

In stores you can find the following models:

— Navien Deluxe 13k; — Navien Deluxe 16k; — Navien Deluxe 20k; — Navien Deluxe 24k; — Navien Deluxe 30k; — Navien Deluxe 35k; — Navien Deluxe 40k.

Navien Deluxe Coaxial boilers - Technical characteristics

Table of technical characteristics of Navien Deluxe Coaxial boilers

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

They come in two types:

— with a coaxial chimney;

- with a separate chimney.

Navien boilers 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 chimney of the “pipe-in-pipe” type. Through the outer pipe there is an influx of air into the boiler from the street, and through the inner pipe there is an emission of combustion products. The diameter of these pipes is 60/100 mm, as indicated in the instructions.

For those situations where, according to the project, the installation of a gas boiler with a coaxial chimney is impossible, practical and cunning Koreans have come up with a boiler with the ability to install a so-called separate chimney .

This type of turbo boiler is already equipped with two connection pipes: the first pipe, which emits combustion products, and the second, for air intake. Instead of the second pipe, you can also use aluminum corrugation, it is cheaper. The diameter of the pipes 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 this is exactly the type of double-circuit gas boiler made in Korea. See the photo below.

When choosing a boiler, also keep in mind that boilers with the 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.

Navien Deluxe 24K boiler with channel separator

The Navien line of gas boilers with an open combustion chamber is presented in models with a power of 13, 16, 20 and 24 kW for heating rooms 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 indicate its power. Boilers of this type do not have a fan (turbine), and combustion products are removed by natural draft.

You can buy an atmospheric boiler if your house already has a chimney, for example, made of asbestos-cement pipes, sandwich pipes or brick pipes. You will just need to purchase separate steel pipes (preferably stainless steel) and run them into an existing chimney.

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

Installation of double-circuit gas boilers of the Navien brand

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

Construction 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); — three-way valve for switching the operation of circuits; — turbine (for versions with forced draft).

Design features of Navien double-circuit boilers

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 itself guarantees a long service life of the gas boiler.

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

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

But, despite this chip, experts still recommend buying a voltage stabilizer, taking into account our Russian realities, when the range of voltage surges in the electrical network can be quite decent.

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

Navien boiler control unit

The display displays information about any malfunction or error during the operation of this equipment, the set temperature of water, coolant, air, as well as time. Using the buttons, the operating 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. Typically, other manufacturers consider this sensor with a thermostat as an additional option and are purchased for an additional fee.

For the “Koreans”, it comes complete with a boiler. And you don’t even need to buy wires: both the boiler and the unit already have them. The difference is made by the boilers of the 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.

Connecting and installing 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 the fittings is from right to left: gas connection, running water inlet and outlet, coolant inlet and outlet.

The diameter of the fittings for service water is 1/2 inch, gas and coolant is 3/4 inch. Don't forget to install ball valves on each supply pipe.

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

Connecting the Navien Deluxe Coaxial gas boiler

Advantages of Navien boilers:

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

Disadvantages of Navien gas boilers:

— noise during operation; — only original spare parts are suitable; - Asian brand.

So, we examined the model range of Korean wall-mounted double-circuit gas boilers Navien , their differences, and disassembled the external and internal structure of the boiler. Let's watch a video review of the boiler. Looking at the technical characteristics, as well as reviews from owners and specialists, Korean-made Navien boilers are perhaps the best today when choosing heating equipment, if we take into account such parameters as price and quality. Overall, this is a very worthy and inexpensive device for the modern heating system of your private home.

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Advantages and disadvantages

The advantages of Navien double-circuit boilers are:

• The ability to simultaneously provide hot water supply and heating to the house.
• Automation of processes, allowing to obtain optimal results with minimal human intervention.
• Environmentally safe operation of equipment.
• Long period of operation, not accompanied by service checks.
• Simplicity and efficiency of system management.
• Relatively inexpensive components and spare parts.

The disadvantages of Navien boilers are:

• Dependence on the availability of electricity, gas and water.
• High noise level.
• Possibility of using components only from this manufacturer.

The disadvantages of the units are due to the design features and, with a competent approach, are fully compensated by the creation of optimal conditions.

Kinds

There are two types of Navien boilers:

• Floor-standing.
• Wall-mounted.

Floor structures are more massive and easier to install. Wall samples are compact, do not fill the room, and fit harmoniously into the interior.

In terms of functionality and design, they differ little from each other, representing only different placement options.

Based on the principle of operation, the following designs are distinguished::

• Atmospheric . These are open burner boilers. They need active ventilation of the room in which they are located. Cheaper compared to other models, they have a relatively low efficiency, which is partially compensated by the use of a copper heat exchanger.
• Turbocharged . These are designs with a closed combustion chamber. The process is supported by the supply of fresh air (turbocharging), as a result of which the efficiency of the installations significantly increases and reaches 91.7%. This design is somewhat more expensive, but more convenient for use in a residential building, which is why turbocharged boilers are most popular.
• Condensation . This category of installations has an additional heat exchanger that uses steam energy from the exhaust smoke. The addition allows you to obtain about 30% more thermal energy, which significantly increases the efficiency of the boilers. At the same time, the cost of condensing units is much higher, which limits demand.

In addition, boilers differ in the type of chimney.

Exist:

• Coaxial type . The “pipe-in-pipe” principle, popular in Europe, is used, where the outer circuit provides air supply for turbocharging, and the inner circuit serves as a chimney. The technology is convenient in that the pipe is brought out through the wall, without requiring complex passages through the floors or roof.
• Korean (separate) chimney . The air supply and the chimney are two separate pipes. Often the chimney is connected to the common chimney of the house, and air is taken in by leading the pipeline through the outer wall.

Despite the presence of various design options, any unit from Korean manufacturers demonstrates high performance and quality.

Types of Navien gas boilers

Boilers from the Navien brand are classified according to the following criteria:

1. Number of circuits . Single-circuit units are designed for heating rooms. They are installed if it is possible to connect to a centralized water supply system. Double-circuit is designed to provide hot water supply and simultaneous heating of objects.
2. Type of instalation . Boilers are installed on the floor and on the wall. The difference between them is in power and size. Floor-mounted ones are used for heating large areas.
3. Camera design . In models with open chambers, combustion occurs when air enters, so high-quality ventilation is necessary. For devices with a closed chamber, combustion products are forced out.

What series and models of Navien boilers are double-circuit

Double-circuit designs of Navien boilers are wall-mounted series:

• Deluxe.
• Deluxe Plus.
• Deluxe Coaxial.
• Atmo.
• Navien NCN and NCB.

Floor-standing double-circuit boilers:

• Navien GA
• Navien GST

IMPORTANT!

The Navien boiler range is constantly being modernized and expanded, so the list of double-circuit boilers is not exhaustive and remains open.

Rating of the TOP 12 best gas boilers Navien

Specifications

For convenience of consideration, we present the technical characteristics in the form of a table:

The best floor-standing gas boilers Navien

A floor-standing boiler is the best option for heating a room from 80 to 800 sq.m. At the same time, the fuel consumption of such equipment is economical. The rating presents the best models according to buyers.

Navien GA 35KN 35 kW

High-performance model for heating rooms up to 350 square meters.

Equipped with a closed combustion chamber for spent fuel.

Has an efficiency of 91.4%. Equipped with sensors to ensure operational safety, including gas control.

Controlled using a remote control . Consumes 3.34 cu. m of fuel per hour. The coolants heat up to 85 °C in a short time.

Hot water output is 12.5 l/min at 40°C.

Characteristics:

• power - 35 kW;
• gas consumption: natural - 3.34 cubic meters. m/hour, liquefied - 2.94 kg/hour;
• coolant temperature - 40 - 85 °C;
• dimensions - 40.2x85.6x63.1 cm;
• weight - 26 kg.

pros

• Beautiful design;
• remote control;
• fast heating;
• durable body.

Minuses

• plaque on the heat exchanger;
• noisy.

Navien GST 49 kW

Multifunctional model for heating a home and organizing hot water supply.

The boiler is connected to a 220 V network.

Consumes 5.5 cubic meters per hour. m of fuel. Suitable for administrative and industrial facilities, as it is a way to heat a room of up to 490 sq.m. in a short period of time.

Gas pressure does not exceed 25 mbar . The coolant temperature is 40 - 85 °C, and the water productivity is up to 28.1 liters per minute. Control is simple using the remote control.

Operational safety is ensured by sensors against overheating and freezing.

Characteristics:

• power - 49 kW;
• gas consumption: natural - 5.5 cubic meters. m/hour;
• coolant temperature - 40 - 85 °C;
• dimensions - 49.1x90.6x76.4 cm;
• weight - 84 kg.

pros

• low price;
• Remote Control;
• high power.

Minuses

• heavy;
• noisy.

Navien GST 60KN 60 kW

Powerful equipment for heating rooms up to 600 square meters.

Made of stainless steel and equipped with high-quality heat exchangers, which guarantees a long service life.

The efficiency is 90%.

The boiler consumes 6.5 cubic meters per hour. m of natural gas .

The use of liquefied fuel is not provided. The coolant heats up to 85 °C. Hot water productivity is high - up to 34.4 liters per minute.

Characteristics:

• power - 60 kW;
• gas consumption: natural - 6.5 cubic meters. m/hour;
• coolant temperature - 40 - 85 °C;
• dimensions - 49.1x90.6x76.4 cm;
• weight - 94 kg.

pros

• quality materials;
• easy operation;
• does its job well.

Minuses

• the expansion tank cannot be connected;
• Cools down quickly when there is a power outage.

Where are they used?

Navien double-circuit boilers are designed for use in private homes or offices of the appropriate size. They are optimally designed to serve such premises, have the necessary power reserves and other capabilities.

The use of such equipment in production workshops or public buildings is difficult due to the large volumes, which reduce the efficiency of the equipment.

In addition, the supply of hot water is relevant specifically in residential buildings, which somewhat limits the scope of use, but allows us to confidently classify these units as household heating devices.

What's included

Navien double-circuit boilers have:

• Two heat exchangers (primary and secondary).
• Circulation pump.
• Three-way valve.
• Expansion tank.
• Fan.
• A burner with a combustion chamber connected to a primary heat exchanger.
• Set of sensors, control board, connecting pipes, etc.

All components, without exception, are manufactured by Navien, which makes them authentic and eliminates the possibility of replacement with parts from boilers from other manufacturers.

Known faults of Navien boilers

The list of faults is quite wide, almost all of them are unique to wall-mounted models. Most often, due to even small voltage drops, the control board (automation) fails; boilers must be connected to the electrical network through a voltage stabilizer. A less painful, but also common problem is the breakage of the make-up valve or its leakage, since it is made of rather fragile plastic. Less likely to fail are: DIP switches, circulation pump, flow sensor, turbine.

Separately, it is worth examining problems that are not always associated with a breakdown (click to expand):

+ The boiler does not heat hot water

If the treated water does not arrive after 30-60 seconds depending on the length of the pipeline, the situation is not normal. The most common reason is clogging of the heat exchanger with scale, which is especially typical for budget twin heat exchangers. Often replacement may be required, but if the contamination is light, the heat exchanger can still be washed. Less commonly, the problem may be a failure of the three-way valve that switches the heating, or a failure of the flow sensor.

+ Pressure drops / does not maintain pressure

A drop in pressure clearly indicates a leak in the heating circuit: pipeline, safety valves, expansion tank, make-up tap, etc. Normal operating pressure in most Navien models should be 1.2-1.5 bar. Most often, the cause is a leaking make-up tap; to correct the situation, you need to check and seal all elements of the system. All possible reasons for a drop in water pressure in domestic gas boilers

+ The boiler does not start at all

The problem is almost guaranteed to be a control board that has failed due to a voltage drop. Despite the manufacturer’s assurances, the wall-mounted model range is extremely vulnerable to the domestic unstable power grid and requires connection through a stabilizer, which is neglected by almost all buyers.

Most common error codes

All models are equipped with an autodiagnostic function, which has quite a lot of measured parameters and makes it easy to diagnose a malfunction using the corresponding error code. Let's look at the most common ones:

+ 02

Problems with coolant circulation in the system. First of all, fill the system with coolant through the make-up tap; the pressure gauge should read 1.2-1.5 bar. Make sure the values ​​are maintained throughout the day. The second main reason may be the failure of the circulation pump, which cannot reach the required speed or turn on at all. Rarely, the cause may be a clogged dirt filter or a faulty flow sensor blocking the operation of the boiler.

+ 03

Open circuit of the flame sensor or lack of signal about the presence of a flame. If all the shut-off valves are open, the burners have not been adjusted and gas flows normally, the problem is in the ignition electrode, which sometimes can be simply cleaned, but more often it will need to be replaced.

+ 10

Incorrect operation of the smoke removal system. First of all, carefully clear the chimney of ice if there is any on its head. If the problem is not solved, the design of the chimney has not been changed in any way, then a possible reason could be strong gusts of wind or problems with the turbine.

+ 13

Short circuit of the flow sensor. Usually, if such an error occurs, the flow sensor must be replaced, but sometimes the problem can be resolved by careful dismantling and cleaning of the mechanism.

His device

A double-circuit boiler performs two functions simultaneously:

• Heating of the coolant (OC).
• Preparation of hot water (DHW).

A primary heat exchanger is used to heat the heating agent. When the OM enters it, it is heated to the highest possible temperature.

Leaving the heat exchanger, the hot flow passes through a three-way valve, which mixes in a cooler return flow to obtain the desired temperature.

The coolant is moved by a circulation pump. The combustion of gas is supported by a flow of fresh air supplied by a fan.

DHW is heated in a secondary plate heat exchanger. Hot water has a temperature inversely proportional to the parsing activity - the lower the pressure in the tap, the hotter the water will be.

All functions are constantly monitored by sensors that display an error on the display if any failures occur.

Installation technology and connection instructions

Installing the boiler is not difficult. Floor samples are simply installed in a designated place, and wall samples are hung on a durable surface using elastic noise-absorbing pads.

It is prohibited to hang boilers on fragile partitions made of plasterboard or other similar material.

The boiler is connected by connecting all necessary communications and power supplies . It is necessary to be careful and carefully monitor the correct connection of the pipelines.

Main attention should be paid to gas pipe connections. Using a soap solution, check for leaks.

There are usually no significant problems with the connection, but representatives of service centers insist on involving their specialists in the installation. It is believed that this option allows for proper connection of equipment and eliminates the possibility of errors.

Download instructions

You can read the instructions in this file.

Price range

The cost of a specific Navien boiler model depends on the power and series of the unit. Basically, prices are in the region of 30-33 thousand rubles. Somewhat cheaper are boilers with an open burner (Atmo series), which can be purchased for 26 thousand rubles.

When calculating the cost, it is necessary to take into account the cost of delivery and installation. In addition, you need to conclude a warranty service agreement, which also costs money. Usually service centers insist on this. so that the installation and connection of the equipment is carried out by their specialists, otherwise the warranty will be denied.

NOTE!

The warranty service agreement is concluded not with the store, but with the service center. Some stores are authorized to enter into contracts on behalf of the SC, others only carry out sales and do not provide a guarantee. In such situations, you must independently conclude an agreement with the SC.