Gas double-circuit wall-mounted boiler

With the start of the heating season, owners of country houses often face the question of which heating boiler is worth purchasing. This article is devoted to an overview of the most popular double-circuit gas boilers. The rating of double-circuit wall-mounted gas boilers was compiled for wall-mounted models from Baxi, Protherm and Navien. We considered models that were similar in price category and technical characteristics with a power of about 20 kW and these were the following models: Main Four 24 F (Baksi), Gepard MTV 23 (Proterm) and Ace 24k (Navien).

The rating of gas heating boilers is made according to such parameters as: manufacturers, design, technical parameters, functionality, cost.

Model Manufacturers

The Italian manufacturer Baxi is in great demand on the Russian market. Almost all regions of the country have service centers that repair equipment. Models are assembled and parts are produced in the brand’s homeland and in a number of European countries. Models with a capacity of 18-24 kW are supplied to the Russian market.

The Slovak manufacturer Protherm is known and distributed in all regions of the Russian Federation. The service network of this manufacturer is also widely represented in all major regions of Russia. The company produces boilers on its own territory; components are produced in Slovakia and Germany. The range of models imported to Russia is 11-23 kW.

The Korean manufacturer Navien was introduced to the world relatively recently, but thanks to its practical design and affordable cost, boilers from this manufacturer quickly became popular. The production of parts and assembly of boilers is carried out directly in South Korea.

A very wide range of models with a power of 10-40 kW is supplied to Russia.

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Design of compared models

The boiler from Baksi is a boiler based on a bithermic heat exchanger and the ability to automatically switch to DHW supply mode. The design includes a circulation pump, a 6-liter expansion tank, and safety sensors. All connections are cast from copper. The coolant is heated by a heat exchanger alternately in two circuits.

The boiler from Proterm has a copper heat exchanger for the primary circuit and a second steel heat exchanger for the DHW circuit. A three-stage control valve is provided to switch operating modes. It is also equipped with a German circulation pump and a 5-liter expansion tank, and safety sensors.

The connections, like those of Baksi, are cast from copper. An important difference between this model and the previous one is the presence of a second heat exchanger, which ensures independent heating of water for heating and the hot water system.

The boiler from Navien is also equipped with two independent heat exchangers, but both of them are cast from steel. Let us remember that the previous model had one of the heat exchangers made of copper. A steel heat exchanger is much more reliable than copper.

All built-in equipment - circulation pump, expansion tank, sensors and valves are manufactured directly in South Korea.

Technical parameters of models

The chimney of all the models under consideration is made according to the coaxial scheme. This means that the same pipe has two compartments, through one of which air is introduced into the boiler, and through the other, exhaust gases are removed.

Dimensions of the tested models (HxWxD, cm):

Baksi 73x40x29.9
Proterm 74.2x44x26.5
Navien 72.2x44x26.5

Heating capacity of models (kW):

Baxi from 9.3 to 24
Proterm from 9.0 to 24
Navien from 9.3 to 24

Volume of produced hot water (l/min)

All models are capable of heating an area of up to 220 m2.

Rating of double-circuit gas boilers:

Model functionality

To compile a rating of double-circuit wall-mounted gas boilers, all compared boilers have the ability to adjust the burner and the function of maintaining the temperature in a separate heating circuit. In addition, all models have frost protection.

Models from Baksi and Proterm provide the ability to connect a room temperature sensor and an outside temperature sensor, thanks to which you can implement the climate control function.

Baksi, unlike other models, has a “warm floors” mode, and the Navien model has a remote control unit. In addition, the Navien boiler is protected from power surges.

Gas boiler rating:

Alphatherm ↑

Floor-standing Alphatherm Beta series gas boilers are manufactured in Italy and a number of Eastern European countries

Alphatherm is an Italian brand of boiler equipment for domestic and industrial use. Production sites are located not only in Italy, but also in Slovenia, the Czech Republic and Hungary. Its product range includes a very wide range of gas equipment:

wall-mounted/floor-standing gas boilers, single-circuit/double-circuit;
combined gas/diesel boilers;
indirect heating water heaters.

Conclusion

Having analyzed the parameters of the boilers according to the indicated parameters, it is easy to conclude that the rating of gas boilers was distributed as follows:

3rd place. Baxi Main Four 24 F

2nd place. Proterm Gepard MTV 23

1 place. Navien Ace 24k

Types of NAVIEN boilers and their features

NAVIEN NCN is a condensing gas boiler with high efficiency. More efficient use of fuel is achieved by re-recovering heat from exhaust gases. As a result, the smoke cools down so much that it can be removed through plastic pipes, which significantly simplifies the process of installing a chimney.

Other features of the device:

boiler power – 19-37 kW;
frost protection;
possibility of programming modes;
work on mains or liquefied gas;
quiet operation;
electricity required;
air from the room is not used for combustion;
approximate prices - 40-50 thousand rubles.

SteelGA/GST is a small, beautiful floor-standing gas boiler that supplies the room with heat and hot water. A modern burner is designed for minimal gas consumption.

power 11-35 kW;
heat exchanger material – high-carbon stainless steel;
SMPS chip for surge protection;
frost protection;
lateral location of the pipes (convenient to install, can be placed close to the wall).

NAVIENAceTurbo and Ace Atmo - wall-mounted gas boiler. The Ace TURBO series is equipped with an APS air pressure sensor. The sensor regulates the rotation speed of the turbocharger fan installed under the combustion chamber. Thanks to this system, the optimal volume of air is supplied and heat loss is minimized.

Navien Ace Atmo

Ace Atmo is a boiler with an open burner. It has the same features and advantages as AceTurbo, but is considered more adapted to the conditions of the Russian winter. Connecting this device is easier.

frost protection;
protection against voltage surges and unstable gas supply;
heat exchanger made of stainless steel;
heating water from a tap even with low pressure;
prices – 19 – 27 thousand rubles.

NAVIEN LST – wall-mounted boilers for liquid fuel. Any brand of diesel fuel can be used. The filter protects from impurities.

For cold regions, the LST-KR model is suitable, where the fuel is preheated (cooled diesel fuel becomes viscous). This allows you to use summer, cheaper diesel all year round. fuel.

light, compact;
Efficiency – 90%;
protection against voltage surges;
two circuits - heat the water;
Included is a set of replaceable filter cartridges;
work with low pressure water;
pipes on the sides;
does not make noise;
prices – 25-75 thousand rubles.

The consumer can always choose the appropriate power of the Navien boiler. Available power options: 11, 13, 16,19, 20, 24, 30, 35, 37, 40 kW

Judging by sales volumes, the most popular boilers on Russian markets are from the Ace series.

Protherm Cheetah 23 MOV

Specifications:

double-circuit boiler;
it has an open combustion chamber;
the volume of the expansion tank is 5 l;
hot water dispensing capacity is 1.5–11 l/min;
consumes power in the range from 10.4 to 25.8 kW;
useful power is 9–23.3 kW;
hot water temperature is adjustable from 38 to 60 °C;
overall dimensions (H/W/D) – 742/410/311 mm;
weight is 31 kg;
heat exchanger – plate made of stainless steel;
operates under pressure of 1–10 atm;
liquefied gas consumption is 1.9 kg/h, and natural gas consumption is 2.73 m³/h;
productivity is 90.3%.

Model description

The wall-mounted heating boiler has a built-in LCD display and mechanical control using buttons. The screen displays the operating data of the device, which allows you to constantly monitor the heating process. The reliable burner is made of chrome-nickel alloy.

Control is carried out using a room thermostat. The safety of the device is ensured by built-in sensors for traction control, water flow, and flame control.

The boiler is equipped with anti-freeze functions, protection against jamming of a three-way valve and pump. The built-in diagnostic system monitors the device status, finds and determines faults.

Advantages and disadvantages

Easy to install and maintain, ergonomic, reliable, compact, operates in winter-summer-vacation modes. A large number of service settings allows you to select the most convenient operating mode.

The disadvantages are low power, high gas consumption, sensitivity to impurities in water. When the water heats up, the heating turns off and vice versa.

Installation is impossible in rooms without a chimney, the arrangement of which has certain requirements. Requires additional air flow, cannot be used in a room with forced exhaust.

Installation and instructions

Upon receipt of the heating device, you should check the package contents, appearance, warranty card and the availability of complete operating instructions. Installation, connection, configuration and initial start-up of the heating boiler should only be carried out by a specialist from the manufacturer.

When operating, the following points must be taken into account:

repairs, replacement of parts or parts of equipment are carried out in special service centers;
changing various settings parameters should also be carried out by a specialist;
all inscriptions on the boiler body must be preserved throughout the entire service life;
Failure to comply with these points during the warranty period allows the company to revoke the warranty.

Design Features

Absolutely all models of Navien boilers are controlled by Russified remote controls. Any boiler has a temperature sensor that allows you to maintain a comfortable temperature.

How the antifreeze system works: when the temperature of the coolant drops to 10 0 C, the circulation pump turns on (it simply drives water through the pipes, preventing it from freezing). If t drops to 6 o C, then the burner automatically starts working.

Navien Ace boiler design

Navien boilers have two separate heat exchangers. This system has the following advantages:

Resistant to clogging and scale from the central water supply system.
It is more convenient and cheaper to repair the heat exchanger.
Greater productivity and quality of hot water supply.

There is a possibility of automatic or manual control. With manual control, you can change the temperature of the heating water from 40 to 80 0 C. At t 40 0 C and below, summer mode is activated. In this case, priority can be given to heating water for your needs. Automatic mode can maintain t in rooms from 10 to 40 0 C.

Navien boiler control panel

The timer, which is also found in NAVIEN boilers, allows you to set temporary operation for half an hour at certain intervals.

Air-gas mixture preparation system. A powerful fan provides the optimal amount of oxygen. Flue gases contain minimal levels of carbon dioxide and nitrogen oxide, which has a positive effect on fuel consumption.

Antifreeze cannot be used as a coolant in systems with Navien boilers.

Five of the most popular gas boilers price-quality

Trying to make a “ranking” like this is always going to be a little subjective. Even in different regions of Russia, users have slightly different preferences for boiler brands - it seems that this is due to the level of gasification in the region, where there is little gas, slightly different boiler manufacturing companies are heard.

Despite this, a certain picture of consumer preferences still emerges, and first of all it is related to the price of gas equipment. The cheaper a company's products are offered, the more popular they are.

One can argue for a long time about the benefits of economical, expensive boilers, but this article is not intended to find out what is better - an expensive, economical one, or a cheap and low-tech one. Ultimately, when a person buys a boiler to heat his own home, he is inevitably guided by the capabilities of his own pocket, and there are always more poor people than rich people.

So, you can take a chance and highlight several popular brands of boilers:

AOGV, AKGV (domestic machine-building plant in Zhukovsky)
Navien
Electrolux
Protherm
Baxi

They are united by their common low cost, but among them there are more expensive and cheaper ones. Let us now take a closer look at the models, their pros and cons.

AOGV and AKGV - domestic boilers are still popular

Abbreviation – gas heating water heating unit and combined gas water heating unit. The first one only heats, the second one can heat water for domestic needs, in other words, it is double-circuit. This is a common abbreviation for domestic boilers; here we mean only the production of the Zhukovsky Machine-Building Plant. The original “ZhMZ” looks like this:

In the photo - a boiler with a capacity of 11.6 kW comfort class

All of them are floor-mounted. The model range is defined, in addition to power, by three subtypes of boilers - economy, universal and comfort.

The first have a Russian automation unit, the rest have an imported one. With an imported unit, boilers are more reliable and a little more functional; domestic automation suffers from failures after just six months. Therefore, we can recommend the station wagon and comfort classes; it will be a little more expensive, but more reliable.

The price of models of the same power with different units varies within 10-15%. The price is also the main advantage of this brand over others - a floor-standing 11 kW boiler (Economy) can be purchased for 12 thousand rubles.

The boilers are completely energy independent, with piezo ignition and natural smoke removal. Hence the requirements for good traction. Suitable for building modular boiler houses.

What is important is that the system can use non-freezing liquids (not all brands of boilers can boast of this), and this is very important for country houses where there is no permanent residence, for example, country houses. The power of different models is from 11 to 68 kW, prices from 12 to 50 tr, efficiency 89%.

Navien is a very popular manufacturer

Korean boiler manufacturer. The range of models is wider than the previous one - both wall-mounted and floor-mounted boilers, with powers from 13 to 60 kW. There are even condensing boiler models with very high efficiency.

Prices start from 24 tr. for wall-mounted atmospheric double-circuits with a power of 13 kW and up to 110 tr. for powerful wall-mounted condensing boilers.

Compared to competitors, Navien boilers are very well equipped. Expensive models are equipped with weather-sensitive automatic control.

The most popular model can be safely called Navien Ace; there are atmospheric and turbocharged ones, with a coaxial chimney. User reviews are generally positive. It works and works. True, there are some that start to leak, and replacing gaskets can cost up to a quarter of the price of the boiler.

It was noticed that the quality of boilers (specifically Ace) fell in 2010-11, then there were some improvements.

It has a built-in surge filter and is not particularly sensitive to the unstable voltage of our networks. They are considered noisy, but mainly by those who use Navien for individual heating of an apartment. In general, for the money it’s a workhorse, quite reliable and unpretentious.

Electrolux

The oldest Swedish corporation produces anything, including gas boilers. The general price range is slightly higher than Navien's. The range of boilers produced is quite wide; there are both wall-mounted and floor-standing boilers.

The most popular are double-circuit boilers of small and medium power - the Basic Space and Basic Duo series. Powers from 11 to 30 kW, prices from 25 to 45 tr, depending on power.

In the photo - model GCB-32, power 32 kW, price around 65,000 rubles.

Reviews of Electrolux boilers are surprisingly good, there are very few complaints about their performance. In general, the boilers work quite reliably, they are quiet and efficient, and have special modes - for example, the “summer” mode for the season without heating.

User complaints most often involve boiler leaks, but they can occur due to improper installation or operation of the unit.

The automation turns out to be very sensitive - on the one hand, this increases the safety of use, but a sensitive reaction to a failure of the parameters (for example, the formation of small ice on the chimney, which is generally a consequence of its incorrect design) leads to the boiler turning off. But after elimination, it will also turn on itself, which it can boast of over many other brands of boilers.

Protherm - known to everyone

The Slovak company was founded in Prague in 1991 and has been producing heating equipment since then. In 2001, it became part of the European concern Vaillant, which in some way can serve as a guarantee of quality, but is also reflected in the price of boilers, which turn out to be slightly more expensive than Electrolux.

The most popular lines are Protherm Cheetah and Panther, both of which are double-circuit wall-mounted boilers. The floor-standing series of more powerful models is the well-known “Bear”.

Cheetahs have a power of 11-24 kW, Panthers 25 and 30 kW. The latter are more focused on connecting an external boiler. Prices for Cheetahs from 27-32 tr., for Panthers 30-35 tr.

The photo shows the “Panther” model with a power of 25 kW.

— briefly about the 25 kW Panther:

Separately, we can mention the Tiger line - for 60 rubles. you can purchase a floor-standing boiler with a capacity of 12-24 kW with a built-in boiler for preparing hot water.

Reviews about Protherm are quite good. Boilers work out their price, most problems arise due to improper installation. It is advisable to use specially prepared water. The equipment is relatively quiet, the automation is adequate and not too sensitive to voltage changes in the network. But once it stops, the boiler will not restart itself.

Baxi

The European group of manufacturers BDR Thermea, Baxi is one of its main brands. The company is quite large and has significant shares in European markets and Russia.

Boiler prices are even higher than those of previous companies, starting from 39 tr. for a Main Four 24F double-circuit boiler at 24 kW, continue to increase to 60-70 tr. for more powerful and richer equipped models. The declared efficiency is more than 93%, which gives hope for efficiency.

The most popular models are Luna and Slim.

Luna – wall-mounted version, photo of the “Luna 3 Comfort” model:

Slim - floor-standing, photo:

User reviews are contradictory. Some even explode. From the discussion of problems on the forums, it becomes clear that problems arise again due to incorrect installation or due to problems with gas supply or water pressure.

On the one hand, the boiler is not to blame, but on the other hand, there are brands that are more adapted to our conditions. Users whose boiler is installed according to all the rules and the gas supply is stable note that the equipment is quite reliable and works without problems.

Boilers of all the brands listed are, for the most part, worth the money spent. It doesn’t happen without marriage or other difficulties.

Despite the variety of manufacturers and models of boilers, in this price category they are all equipped with very similar, and sometimes even the same automation, on which the operation of the boiler greatly depends - thus, the difference between popular manufacturers sometimes comes down to different designs and differences in the little things that can also become decisive.

First of all, you need to pay great attention to the design of the heating system, the location of the boiler, the organization of the chimney, uninterruptible power supply, etc. These are the most important factors influencing the longevity of the equipment, and most problems in the operation of boilers occur precisely because of the conditions in which they operate, regardless of the price, be it a boiler for 30 or 130 rubles.

Source: https://kotel-kontur.ru/gazovy-e-kotly/pyaterka-samy-h-vostrebovanny-h-gazovy-h-kotlov-tsena-kachestvo/

Elimination of some problems in the operation of the boiler

Like any, even the most reliable equipment, some problems may arise in Navien boilers, some of which the owner of the device can fix on his own.
First of all, it is important to recognize the cause of the breakdown.

So that the owner can quickly learn about the problem and respond competently, the self-diagnosis system displays data with an error code.

Here are the fault codes for Navien boilers:

01e – equipment overheated.
02e – there is not enough water in the heating / the flow sensor circuit is broken.
03e - no flame signal is received: there may really be no flame, or there may be problems with the corresponding sensor.
04e – false data about the presence of a flame/short circuit in the flame sensor.
05e – problems with the heating water t sensor.
06е – short circuit in the heating water t sensor.
07e – problems with the hot water supply t sensor.
08е – short circuit in the hot water supply t sensor.
09e – problem with the fan.
10th – problem with smoke removal.
12th – the flame went out during work.
13e – short circuit in the heating flow sensor.
14e – no gas supply.
15e – problem with the control board.
16th – the boiler is overheated.
17e – error with DIP switch.
18e – the smoke removal sensor is overheated.
27e – problem with the air pressure sensor (open or short circuit).

How to choose power?

All types of heaters are produced in a wide power range; each buyer can choose the option that best suits the heated area. When choosing power, take into account the following factors: