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.

Owner reviews

Before you buy a good gas boiler from Navien, it wouldn’t hurt to study reviews from existing users. They will point out weak points and help give a preliminary assessment of certain models.

Gas boiler Navien DELUXE 24K

Alexey, 29 years old
It took a long time to choose the boiler - before we settled on Navien, we read a bunch of reviews and testimonials. After numerous consultations with sellers and heating specialists, we settled on this model. The installation was carried out by the same specialists; I did not dare to do anything myself. The first winter was successful, there were no breakdowns during operation. Very convenient controls - the remote control was placed next to the sofa in the living room. You set the temperature, and the unit 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 slimmer;
• Low noise level - a couple of times in the winter we went to visit our neighbors and heard their Baksi boiler working, the fan rumbling and howling;
• Quickly achieving the set temperature is important after our long business trips, when you enter the house and want to quickly feel comfort.

Flaws:

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

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

Gas boiler Navien DELUXE COAXIAL 24K,

Stepan , 37 years old
I have never trusted modern double-circuit gas boilers, and my instinct was completely justified. Friends persuaded me to take a model from Navien, they say it works great and is inexpensive. I had just finished building a house and urgently needed heating. I took a double-circuit unit, and after a year and a half I began to count the number of breakdowns. It’s not the most reliable device, so I can’t recommend anyone to buy it. If you are going to do heating, then you need to install a regular floor-mounted single-circuit unit with an indirectly heated water heater - it will be inexpensive and quite reliable.

Advantages:

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

Flaws:

• 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 was nonsense, that it was necessary to take a boiler with a copper heat exchanger;
• One of the buttons on the remote control quickly malfunctioned;
• A gas boiler from Navien often shows errors that actually do not exist - the electronics are probably faulty.

My recommendation is that you don’t buy these flimsy double circuits.

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-standing units more than tightly packed wall-mounted modifications. I was not mistaken in my choice - the gas boiler pleased me with its trouble-free operation, the Koreans did a good job. And the hot water supply performance here is impressive, up to 22.1 l/min - not a single wall-mounted model 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 operating modes for a week in advance. Since I’m in the city on weekdays, the device operates in antifreeze mode, saving money in my wallet. By Friday evening, it begins to fill the house with warmth, so my family and friends arrive to an already warm home;
• There is nothing stopping you from simultaneously opening the hot water taps in the shower stall and above the kitchen sink - there is enough capacity for all water taps;
• It can run on liquefied gas, which was a big help in the first year, then a gas main appeared in the village.

Flaws:

• For the first year, the Navien gas boiler stood in a small boiler room on the ground floor, but then we had to move it to the basement - it was noticeably noisy;
• 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 clear.

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

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.

Well, now about the shortcomings

I won’t lie, they exist. Of course, although the boiler is gas, it runs on electricity and if it fails, all settings are lost. It cannot be left unattended in winter.

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Secondly, it heats up unevenly, first heating up the batteries, which becomes hot, then turns off and becomes cold. But we eliminated this shortcoming in the second year.

To make it safer, we simply connected a constantly running pump with the heating on. Problem solved.

I would like to give advice to those who use such a boiler: the filter mesh on the return pipe in front of the boiler should be in a strictly horizontal position and turned 10-15 degrees downwards when turning it off with two taps. Then it works as expected.

In general, such a boiler can be recommended to those whose hands grow from the right place, and who can identify and eliminate minor defects, such as dripping condensate, themselves. If you are afraid of every hiss, then the craftsmen will have to give half their salary.

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.

Navien, Baxi or Protherm

These two European manufacturers are often compared not only by sellers, but also by buyers themselves. Generally speaking, there are not many differences between the products of Baxi and Protherm, but the difference between them and Navien is noticeable. All similar Navien gas boilers are at least 10-15% cheaper; only some Baxi and Protherm models are equipped with room thermostats and programmable operating modes; in terms of the efficiency of converting gas into thermal energy, the boilers of all three manufacturers are similar. However, models from European manufacturers do not have most of the disadvantages of Korean boilers.

In our opinion, functionality and lower cost do not justify spending time and money on further maintenance and repairs; moreover, problems with the boiler in the middle of the heating season are an extremely unpleasant situation. According to service statistics, there are several times fewer calls for Baxi boilers (in percentage terms), and even less for Protherm boilers.

No matter what gas service workers or store managers claim, you can find out at least some real information by analyzing the number of problems described on forums, in comments to videos, or by talking with owners or service specialists. Therefore, in our opinion, it is worth choosing Navien boilers only if you have a really limited budget, and it is better to choose only the models described above (Ace or GA). Of course, we do not deny the trouble-free operation of the entire model range in most cases.

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.

Installation Features

Consumer reviews also show what features the installation of Navien boilers has. Installation of double-circuit wall-mounted models is a fairly simple and uncomplicated procedure, because the manufacturer includes instructions for such equipment . You can install the boiler yourself.

As reviews show, we should not forget that the installation of navien gas heating equipment requires a number of works carried out only by specialists who control gas consumption. Even with proper installation, the presence of gas company workers is mandatory. This is also necessary to conclude an agreement allowing the installation of a navien boiler, and to obtain permission to operate such equipment.

Specifications

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

Characteristic	Meaning
Category, performance	II2H3P C13, C43, C53
Purpose	Heating (HV) and hot water supply (DHW)
Fuel	Natural or liquefied gas
Efficiency	86, 90,5, 91,7%
Thermal power	9-12-24-35 kW for heating 24 kW for hot water
Heated area	Up to 600 m2
Coolant temperature	40-80°
Coolant pressure	0.6-3 bar
Hot water temperature	30-60°
Hot water pressure	0.3-8 bar
Hot water capacity: At 25° At 40°	13.8 l/min (25°) 8.6 l/min (40°)
Gas consumption	0.95-2.58 m3/hour (natural gas), 0.79-2.15 kg/hour (liquefied gas)
Gas pressure	10-25 mbar (natural gas), 28-37 mbar (liquefied gas)
Power network settings	230 V/50 Hz, 150 W
Chimney pipe diameter	60/100 mm
Connecting dimensions (gas, water, coolant)	G3/4“ G1/2“, G1/2“
Case dimensions	695/440/265 mm 430x720x340 mm 402x904x691 mm
Boiler weight (without water)	26, 28, 68 kg

Error codes

Despite the saturation of electronics, Korean heaters are functional, like any equipment, they can break down. Startup and operation do not always go smoothly - problems may occur during the process, and numbers appear on the display - error codes. The decoding of the codes can be read in the instruction manual. Common problems:

• Error "01". May occur due to a clogged system or pump malfunction.

• Error "02". The heating system flow sensor has tripped. There are several reasons:

— air has entered the system;

— the coolant filter at the inlet is clogged;

With error “02”, hot water disappears. The water temperature rises sharply and then drops. It is likely that there is an air lock in the hot water system. It appears due to low pressure, poor operation of the circulation pump, or breakdown of the flow controller. In this case, you need to adjust the pressure and bleed air from the system.

• "03". The flame sensor worked - it “did not see” the fire. Causes:

— low gas pressure;

— the ignition electrodes are dirty;

— poor gas quality;

— the sensor is broken or there is a break in the electrical circuit conducting its signal.

• "10". Incorrect combustion products are removed. Causes:

— the pressure sensor is incorrectly connected;

— excessive length of the pipe.

It happens that there are no problems with the chimney - perhaps the signal is caused by gusts of wind. Then the reason is in the chimney - it needs to be redone. To temporarily correct the situation, you can remove the air supply hose. But this is done only as a temporary measure.

Important! It is recommended that when installing boilers, the chimney should be located on the leeward side.

All Navien modifications are reliable, but the duration of their operation largely depends on how the installation was carried out, how the maintenance is carried out and whether the settings are set correctly.

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.

Differences between Navien and analogues

The Korean manufacturer is among the few that use their own designs. The brand does not produce modified or slightly improved versions - each new modification is worked out to the finest detail. Among the design advantages it is worth noting:

• Remote control via iOS and Android systems. This is for the SMART TOK series.
• Modulating burners. Quiet operation depends on them; they are responsible for maintaining a comfortable temperature for humans.
• Thanks to voice prompts, the operation and configuration of the devices is simplified. If the user is not well informed about how the device works, voice prompts and error codes will help him.
• Meets our conditions - possible decrease in pressure, voltage surges in electrical networks, pressure drops in gas pipes.
• Self-diagnosis. The device itself determines its “diseases” and notifies the user about them by displaying an error code on the display.

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The Korean manufacturer, taking into account possible risks, created safe and easy-to-use equipment. If you take an interest in the statistics of reviews, it becomes clear that consumers have managed to evaluate the quality of heat exchangers and burners, as well as the uninterrupted operation of Korean heaters. Only 2% of buyers contact service centers, and even then, the problems are usually caused by incorrect connection or operating errors. To prevent the boiler from creating problems, you need to connect it correctly and configure it correctly. It is also important to know how to use gas equipment - for this purpose, instructions are attached to each piece of equipment. The kit also includes a passport and connection diagram.

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.

About the manufacturer

KD Navien Co., Ltd. has been producing heating equipment for more than 30 years and has established itself as a manufacturer of optimal technical characteristics and multifunctional equipment. It is present on the Russian market in the form of the official representative office of NAVIEN RUS LLC. The service structure is extremely developed and covers all regions of the country, not only the Moscow region.

Gas boilers of this brand have a fairly standard, simple but effective device with an average efficiency of 90-92%, depending on the model. First of all, the emphasis is on lower cost; in comparison with analogues, Navien boilers are always at least 5-10% cheaper. Therefore, even in the middle price segment, the manufacturer saves significantly on materials. The heat exchangers are steel, not copper, the pipes are also usually steel, the circulation pumps are quite noisy, like all switches, there is no thermal insulation. However, at an affordable price, this is more of a post than significant disadvantages.

Device using Navien DELUXE ONE as an example. Standard efficient layout, steel pipes, plastic hydraulic group. There is no thermal or noise insulation layer.

What else the manufacturer’s gas boilers are known for is their wide automation functionality. Even the most budget models costing 30-35 thousand rubles have a programmer that allows you to set the boiler operation settings for the next day or week. More expensive models already have a remote control (room thermostat) and external temperature sensors as standard. The controls and menus themselves are quite clear and convenient.

However, despite all the advantages, the reliability of heating boilers, especially mounted ones, raises questions. According to the statistics of service requests, products are not the leader in the number of breakdowns, but the opinion that Korean equipment is unreliable is not prejudice. Most often, the boiler displays errors 02 and 03, associated with circulation or ignition problems, respectively. Almost all existing components fail, most often these are: a three-way valve, a circulation pump, a turbine.

In recent years, models 8-10 years old often have problems with heat exchangers, which in general is practically the norm for steel structures when using hard, contaminated coolant.

There are many cases of problem-free operation over many years; it would be more correct to say that they are the majority. However, statistics of service calls show that the manufacturer’s wall-mounted gas boilers are among the least reliable in the price segment, along with Italian Ferroli and others. It is worth noting that floor-standing models are almost completely problem-free.

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.

The most common problems

Often the causes of problems are low quality coolant or gas. Error codes help you solve problems. Here are the most common malfunctions that can occur with Korean gas equipment:

• Overheating.
• No flame signal.
• The fan is faulty.
• Damage to the control board.
• Short circuit in the flow sensor circuit.

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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.

Basic malfunctions and their solutions

Malfunctions of Navien boilers are usually diagnosed independently and displayed on the display with the corresponding code. Based on a signal from one or another sensor, a message about the problem that has arisen is activated.

The most common mistakes are:

• 02. Lack/insufficient amount of water in the system. The issue can be resolved by recharging the system or replacing the flow sensor.
• 03. No flame in the combustion chamber. Indicates problems with the ignition system, or lack of gas.
• 05-06. Open circuit or short circuit of the fresh air sensor.
• 07-08. Open circuit or short circuit of the DHW sensor.
• 09. Fan failure.
• 10. Failure of the smoke removal system.
• 15. Problems with the control board.
• 16. Boiler overheating.

The solution to most problems is to replace the corresponding sensors or components, as well as to clean and remove deposits in the connecting pipelines.

IMPORTANT!

It is not recommended to undertake repairs yourself. This procedure should be entrusted to specialists from the service center or other specialized organization.

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.

How to choose and what to pay attention to?

Basic parameters for choosing a gas boiler for residential, administrative and industrial premises:

• power - the efficiency of heating the room depends on it;
• type of installation - the brand’s line includes floor and wall models;
• burner type - devices with natural smoke removal of combustion products and are equipped with a closed combustion chamber;
• functionality - there is equipment with the ability to connect a boiler to provide hot water supply;
• additional elements - models are equipped with overheating sensors, screens displaying information about pressure and temperature, remote controls and a display displaying information about the operation of the device.

How does Navien Ace TURBO work?

For example, consider the description of the operation of a turbocharged heater. Such a device is not afraid of low fuel pressure or power surges. It will heat any area. At the same time, it heats the water - there is a second circuit. DHW heat exchanger – steel. It is much cheaper than copper analogues. The lack of power - due to the insufficient thermal conductivity of steel - can be compensated for by turbocharging the burner. Such devices easily compete with analogues that have copper heat exchangers.

The turbo heater monitors the temperature of the coolant - if it drops below plus 10 degrees, the circulation pump turns on. It drives water, preventing ice crystals from forming. When the temperature drops below plus 6 degrees, the burner will light up and heat the coolant to +21 degrees.

Turbocharged devices are available in two modifications, the second - with a coaxial chimney “Navien Ice Turbo Coaxial”. It is advantageous to install it in rooms where it is impossible to ensure a normal supply of oxygen. A coaxial chimney takes air from the street.