And also, in which house the device will be installed, and how many people will use the hot water supply. The power and set of necessary functions of the unit depend on this.
Double-circuit gas boilers provide both autonomous heating and hot water supply. For these purposes, they are equipped with independent heat exchangers.
To make your choice easier, we have collected the best models of gas double-circuit boilers presented on the Russian market in 2020.
We took into account the price/quality ratio, expert opinions and consumer reviews. In our list you will find only the most popular devices!
Rating of the TOP 20 best double-circuit gas boilers of 2021
| Place | Name | Price |
| TOP 3 best double-circuit gas boilers in price/quality ratio for 2021 | ||
| 1 | BAXI ECO-4s 24F 24 kW | Find out the price |
| 2 | Buderus Logamax U072-12K 12 kW | Find out the price |
| 3 | Protherm Panther 25 KTV (2015) 25 kW | Find out the price |
| TOP 3 best wall-mounted double-circuit gas boilers | ||
| 1 | BAXI LUNA-3 COMFORT 240 i 24 kW | Find out the price |
| 2 | Viessmann Vitopend 100-W A1JB011 29.9 kW | Find out the price |
| 3 | Navien Deluxe S COAXIAL-24k | Find out the price |
| TOP 3 best floor-standing double-circuit gas boilers | ||
| 1 | Lemax Premium-25B 25 kW | Find out the price |
| 2 | Lemax Premium-30B 30 kW | Find out the price |
| 3 | Lemax Premium-20B 20 kW | Find out the price |
| TOP 3 best double-circuit gas boilers 24 kW | ||
| 1 | Vaillant atmoTEC pro VUW 240/5-3 24 kW | Find out the price |
| 2 | Ferroli Divabel F24 | Find out the price |
| 3 | Vaillant turboTEC plus VUW INT 242/5-5 24 kW | Find out the price |
| TOP 2 best turbocharged double-circuit gas boilers | ||
| 1 | Bosch Gaz 6000 W WBN 6000- 12 C 12 kW | Find out the price |
| 2 | Buderus Logamax U072-28K 28 kW | Find out the price |
| TOP 2 best energy-independent double-circuit gas boilers | ||
| 1 | Siberia 17K 17.4 kW | Find out the price |
| 2 | Lemax Premium-12.5NB 12.5 kW | Find out the price |
| TOP 2 best double-circuit gas boilers with a closed combustion chamber | ||
| 1 | BAXI ECO-4s 18F 18 kW | Find out the price |
| 2 | Bosch Gaz 6000 W WBN 6000-18 C 18 kW | Find out the price |
| TOP 2 best condensing double-circuit gas boilers | ||
| 1 | Viessmann Vitodens 050-W BPJC 24 kW | Find out the price |
| 2 | BAXI Duo-tec Compact 24 20 kW | Find out the price |
Double-circuit wall-mounted gas boiler - which one is better for heating a private home?
In this article I will tell you how to choose a gas boiler for a private home. What is the most reliable gas boiler, and why I think so.
I will not consider domestic manufacturers of gas boilers. I see them extremely rarely, so I can’t draw any conclusions.
If you need to make a heating system and don’t want to understand everything, order a technical calculation of the heating system from us. You will receive diagrams and drawings with explanations. According to which every person can install a heating system if his hands grow from the right place. The cost is 100 rubles per m².
The best manufacturers of gas boilers
European manufacturers: VIESSMANN (Vissmann), VAILLANT (Vailant), BUDERUS (Buderus). German organizations that, taking into account globalization, have production in Turkey, Russia, and China. This trio specializes in thermal equipment. They fill the niche of thermal energy sources. From gas wall-mounted and floor-standing boilers to heat pumps. They also produce solid fuel, diesel and electric boilers.
Italian manufacturers: FONDITAL (Fondital), ARISTON (Ariston), BAXI (Baksi), FERROLI (Ferroli).
Korean manufacturers: NAVIEN (Navien), KITURAMI (Kiturami), KOREASTAR (Koreastar) and MASTER GAS SEOUL (Master gas Seoul).
Chinese manufacturers: OASIS (Oasis) and ROSTERM (Rosterm).
The most reliable gas boiler
In my opinion, the most reliable gas boiler is Viessmann. Just as car manufacturers have small, mid-range and business class, boiler manufacturers segment their boilers to capture market share, and Viessmann has cheap and expensive boiler models.
Wissmann has a popular budget model of a double-circuit gas wall-mounted boiler VITOPEND (Vitopend), with a power of up to 35 kW. They are relatively inexpensive; Viessmann Vitopend 100-W can be purchased for 45 thousand rubles.
Rating of gas boilers for reliability and quality 2020
My rating of budget wall-mounted double-circuit gas boilers in terms of reliability and quality will be as follows:
- VIESSMANN VITOPEND 100-W
- ARISTON EGIS PLUS 24 F
- BAXI MAIN 5 24 F
- BUDERUS LOGAMAX U072-24K
- FONDITAL MINORCA CTFS 24
- IMMERGAS EOLO MYTHOS 24 2 R
- DAEWOO 200 MSC
Didn't you see the Vaillant boiler in my rating? Because I don’t recommend Vaillant, Navien, Ferroli boilers to anyone. After reading the article to the end, you will understand why.
The best double-circuit gas boiler - review from an installer
In my opinion, VIESSMANN VITOPEND 100 has a balanced balance of simplicity, and at the same time reliability and quality. In complex equipment, maintaining this balance is incredibly difficult.
On January 2, 2021, I replaced my old VIESSMANN VITOPEND 100 with a new condensing boiler VIESSMANN VITODENS 050. I believe that this is the best budget condensing gas boiler in terms of price-quality ratio.
German wall-mounted double-circuit gas boilers
I like that Wissmann makes complex boilers that consist of some simple components that are as reliable as possible. The menu is primitive, even my mother can figure it out.
And Vaillant begins to fall into some kind of complex menu, the mandatory participation of a service specialist. I don’t like their service policy; the over-engineered boiler control logic irritates me.
Why order a project if you can do it without it?
The user in Vaillant cannot figure it out. To change the boiler settings, you need to consult the instructions, or go somewhere, etc. On the one hand, this is a plus. In the sense that this is protection against fools, so that the user does not interfere with the operation of the boiler. On the other hand, this makes life difficult for installers.
Protection of solid fuel boilers from overheating
It is difficult to explain to the user over the phone what and where to press in order for the boiler to turn on after it has gone into error.
Vailant boilers are economical and technologically advanced, but in our operation this may be a disadvantage. They are picky about the quality of water and electricity. Those boilers that were installed 8-10 years ago (I have accumulated my own breakdown statistics) break down more often than Wissmann.
Although this is the same class of device. Vaillant has expensive spare parts, and according to my statistics, they break down more often than Buderus.
If we consider more budget options, this is Buderus. In general, the boilers are reliable. These boilers are produced here. Cheap parts, normal build quality. According to my observations, the boilers are reliable.
I installed approximately the same number of boilers from Wissmann and Buderus, but Vailant had much fewer, and 80% of Vailant boilers had some kind of breakdown of varying degrees of complexity. But they were all noticeably expensive. Even replacing the make-up valve cost 2-3 thousand rubles. Buderus never changed the feed valve in the boilers.
So I try not to recommend Vaillant. In my opinion, Vailant’s entire policy is geared towards service, and to become a service you need to buy a set of spare parts. This is relevant for the Moscow or northwestern region. People live richer there, they think about service, and are willing to pay for it.
Installers can earn money from warranties and service.
In the Krasnodar Territory and Adygea there are few people willing to pay for a guarantee and service. But loading up on spare parts for Vailant boilers and trying to make money on repairs by imposing additional services on customers is not our style.
Italian wall-mounted double-circuit gas boilers
Italians in general are not bad in quality, but, in my opinion, worse than the Germans. Overall, I liked Baksi, their approach, and service policy. Spare parts are cheaper than the Germans, but also quite expensive. Boilers rarely break down.
Ariston are generally good boilers; there are components that break regularly. This is a three-way valve if there is a divided heat exchanger in the boiler.
In Adygea, where there is hard water, the valve breaks once a year.
Fondital and Nova Florida are quite poorly distributed in our country. They used to be popular because of their low price. Cheap boilers according to Italians. I haven't installed them for the last five years. Those boilers that I installed before work normally even under poor operating conditions.
Ferroli. I also do not recommend these gas boilers. Expensive spare parts and problems with service.
Korean double-circuit wall-mounted gas boilers
Navien boilers are common in our region. Cheap segment, entered the market well. The boilers are not bad, but there is a weak component that ruins everything. This is the primary heat exchanger. They have him dead. If something breaks in Navien, then 90% is the primary heat exchanger.
Now that we have accumulated many years of experience in their operation, it is clear that customers do not like it. Negative word of mouth spreads. I think that because of this, Navien’s sales probably fell.
In general, the boiler is unpretentious, spare parts are cheap, but the primary heat exchanger ruins everything.
If they got rid of the design flaw with the heat exchanger, I think they would have greatly captured the market. I myself would put them on with great pleasure. There is no point in buying a boiler that will break down in a year or two on hard water. The heat exchanger for this boiler costs from 6 thousand rubles + work to replace it.
I installed few Naviens, but maintained a lot. I have not seen a boiler that worked for more than three years without breaking the heat exchanger. I came across old boilers with a copper heat exchanger that worked trouble-free for 6-8 years.
Kiturami. I can't say anything bad. They are not widespread in our country, inexpensive spare parts.
Deo . There was a time when these boilers often broke down. But then the design was improved, and the boilers stopped falling. In general, the boilers that I came across and installed myself performed well.
Chinese double-circuit wall-mounted gas boiler
Chinese gas boilers often break down. But Chinese boiler manufacturers are gradually taking over the market and are constantly improving quality.
Pressure testing of the heating system - nuances and tricks from the installer
My prediction: within 5 years they will begin to actively invade the market, because the quality will improve, the price is low + development has begun in automation, controlling the boiler from the phone. Sensor technology, remote access, all this will be integrated into boilers.
Nowadays there are such electric kettles that, in terms of functionality, remind me a little of a spaceship. Gas technology is a little conservative in this sense. Of course, some models of gas boilers have access via the Internet; some settings can be made from a smartphone. But all this is not the same. I think that in the near future the Chinese will make a breakthrough in gas technology.
Poor operating conditions of gas boilers
Few people know, and even more so pay attention to the operating conditions of gas boilers. Boilers break down quickly due to two reasons:
- Chemically and mechanically polluted water. Impurities of sand, scale, a lot of iron, increased hardness.
- Lack of grounding, voltage surges.
Due to water quality, heat exchangers and valves fail.
The gas boiler must be serviced periodically.
Double-circuit gas boiler for heating a private house
Double-circuit boilers are suitable for small heating systems with an area of up to 100 square meters. With one bathroom and preferably adjacent to the kitchen. And the boiler was nearby. For apartment heating, double-circuit boilers are a great solution.
If there are 4 or more people living in a house, two bathrooms, if there is a large distance between the boiler and consumers, then the double-circuit boiler begins to work at the limit of its capabilities, which leads to its breakdown.
I would not recommend installing double-circuit gas boilers with a power of less than 20 kW for one reason: this boiler power is excessive for heating, and for hot water supply it will not be enough.
In order to heat the water in the flow, you need to apply more power.
In order not to be unfounded, I will give the numbers and logic of calculations.
Calculation of the power required to prepare hot water
Cold water entering the boiler has a temperature of 12°C.
The boiler heats the water, and at the boiler outlet the hot water temperature will be 50°C. I set the number to 50 degrees, you can set your hot water temperature. In wall-mounted double-circuit boilers it is adjustable from 30 to 60 degrees.
The difference between the temperature of the water entering the boiler and leaving the boiler is called Delta. In my example, 50-12=38 degrees.
I don’t want to explain to you about the heat capacity of water, give you formulas that no one will understand anyway. To simplify, we can say: to heat 1 liter of water by 1 degree Celsius, you need to spend 1 Wh of energy.
When you open a hot water tap, approximately 8 liters of water flow out per minute. Therefore, in one hour, 8 l * 60 min = 480 l / min will flow out of this tap.
In my example, Delta was 38°C. 38*480=18,240 W/h or 18.2 kW/h. This is the power needed to heat water in a stream. Therefore, most manufacturers make wall-mounted double-circuit gas boilers with a power of 20 kW or more.
This power of a gas boiler is needed not for heating, but for preparing hot water!
Therefore, if you have 2 bathrooms and 4 people live, there is a high probability that two or even three people will turn on the hot water at the same time. The boiler will not have time to heat the water. There will be a long delay in hot water.
What power should a gas boiler have?
A wall-mounted boiler with a power of 24 kW provides 1-2 hot water points. It is difficult to heat hot water in a stream. Installers and customers do not know this. That the boiler power is needed for preparing hot water , and not for heating.
Pressure testing of the heating system - tricks from the installer
I often come across situations: 4 or more people live in a house, there is a half-ton bathtub, two bathrooms, one of them is on the 2nd floor. The installers installed a double-circuit gas boiler in the basement. The owner of the house complains that he has to wait a long time for hot water, and the boiler often breaks down.
This is a matter of equipment selection and system design. This is where people often go wrong. Order a heating system calculation from us. It is not expensive.
I explain to people this way: if more than 4 people live in a house, the distance between consumers is more than 5-7 meters, bathrooms are on different floors, and you already have a double-circuit gas boiler installed, then you need to recirculate, install an indirect heating boiler.
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Which gas boiler to choose for heating your home
Now I recommend the Wissmann Vitopend wall-mounted gas boiler. This does not mean that I am a fan of Wissmann, and I recommend him to everyone. This is how market conditions developed.
There was a period when I staged Wissmann. I explained to people about quality and reliability. Then the price of Wissmann rose, people were looking for cheaper options. At that time, I installed Baxi and Ariston boilers, Fonditals.
Then Fonditals went up in price, Wissmann fell in price. The Wissmanns have gone again. I dissuade people from Koreans, but if they insist, put in a Korean, if there’s no money, I’ll put in. And then I prefer to put Deo. They are better than Navien.
I installed Aristons at one time, but they had a bad service policy. Perhaps it is still preserved. I can’t say that the Aristons are bad boilers, but the non-customer-oriented service spoiled everything. For this reason I stopped using Ariston.
How to choose a double-circuit gas boiler?
The first criterion that you need to pay attention to is the power of the gas unit.
It is equally bad if it is not enough for heating and hot water supply or if there is too much. A boiler that operates at half capacity or at peak loads quickly fails.
When calculating the design capacity of a gas boiler, take into account:
- area and height of ceilings of the heated room;
- quality of home insulation;
- climatic conditions;
- pressure in gas networks - deviations from the norm increase the load on the boiler;
- number of people living in the house.
The easiest way to determine the approximate power of a gas double-circuit boiler is to divide the area of the house by 10 (1 kW = 10 m2) and multiply by a correction factor of 1.2-1.5 (20-50% is a reserve for heating hot water and taking into account peak loads).
The ratio “1 kW = 10 m2” was determined based on many years of observations in the Moscow region and is valid for its climatic conditions and brick houses with good thermal insulation. If your room is located further north or does not hold heat, the gas unit should be 2 times more powerful.
The second selection criterion is the installation location of the boiler . Depending on the type of placement, the devices are wall-mounted or floor-mounted. They differ not only in the installation method.
Wall-mounted boilers, as a rule, have lower power, since they cannot accommodate large heat exchangers and storage tanks. In addition, they are all energy dependent. Among floor-standing boilers there are models that operate without electricity. They do not require UPS and voltage stabilizers.
Rating of the best models of wall-mounted gas boilers
Oasis BM-16
This boiler can be used in rooms where the air temperature is not lower than +5 degrees; it is installed in strict accordance with the gasification project. It is perfect for houses or apartments, has high performance and a good efficiency of about 92%. The design has a reliable circulation pump, which allows you to easily raise the coolant to the level of the second floor.
The average service life is about 12 years from the moment of first launch. The heat exchanger is made of copper, the combustion chamber is closed, equipped with a fan to remove combustion products. The device’s security system has several levels; the boiler can independently carry out diagnostics. If errors are detected, their codes are displayed on the device display; there is a built-in condensate drain. The device is economical and consumes a minimal amount of fuel. The weight of the unit is small - it can easily be lifted by one person.
The chimney can be used coaxial or separate. The boiler runs on natural or liquefied gas, the coolant temperature is regulated from 30 to 80 degrees, hot water - from 36 to 60 degrees. When installing a hot water supply system, it must be taken into account that the minimum volume of passing water must be at least 3 liters per minute. Ignition is carried out by a built-in piezoelectric element.
Advantages:
- High reliability;
- Reasonable cost;
- Self-diagnosis with display of all errors;
- Built-in frost protection;
- The design has a 6-liter expansion tank;
- Several programmable timers.
Flaws:
- Large overall dimensions;
- Some sensors fail quickly.
Wall-mounted gas boiler Oasis BM-16
9. Haier Falco L1P20-F21(T)
A double-circuit design equipped with a bithermal heat exchanger, the unit can be installed both in houses and apartments. The device is characterized by the presence of several degrees of protection: it has a flame failure protection system, the circulation pump is equipped with protection against jamming. The heat exchanger has a sensor that prevents overheating, excess pressure, and lack of draft.
The heat exchanger is made of copper, the modulating burner is made of stainless steel, the hydraulic block is made of brass. The total power of the boiler is 20 kW, the coolant temperature is adjustable from 30 to 85 degrees, the heated area can reach 190 square meters, the volume of the expansion tank is 6 liters. The design has small dimensions - 700*400*320 mm. Combustion products are removed from the closed chamber using a metal fan through a coaxial chimney. The pressure range in the heating system is from 0.3 to 6 bar.
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Advantages:
- High-quality bithermic heat exchanger;
- Small sizes;
- Reasonable cost;
- Large heated area;
- A whole set of protective systems;
- A powerful circulation pump that easily raises the coolant to the level of the second floor.
Flaws:
- The location of the inlet and outlet pipes is not very convenient;
- Lack of Russian language on the control display.
Double-circuit wall-mounted gas boiler Haier Haier Falco L1P20-F21(T)
MORA-TOP Meteor
This boiler has a fairly simple control system, equipped with a monochrome liquid crystal screen and two handles - one regulates the temperature of the coolant, the second is responsible for heating the water. During production, all current safety requirements were taken into account: the device is equipped with a closed combustion chamber. The boiler can be installed in place independently - it is lightweight. The control unit is directly connected to all connected elements: it receives signals from sensors of pressure, temperature, volume of passing water, regular and emergency thermostats and many others.
Depending on the information received, the control unit increases or decreases the supplied amount of gas. The device is characterized by excellent efficiency, since it consumes exactly as much fuel as is currently required. The efficiency of the boiler is about 91%. The water is heated quite quickly - in just a few seconds. The design includes a safety system that prevents the burner from being turned on and off too frequently.
Advantages:
- Easy to manage;
- Makes minimal noise during operation;
- The kit includes a room thermostat;
- Heat exchanger overheat protection;
- Withstands voltage surges well;
- Convenient to service;
- Releases a minimum of harmful substances into the environment.
Flaws:
- When connecting to the electrical network, you will definitely need to equip it with grounding;
- The power of the circulation pump may not be enough for the second floor.
gas boiler MORA-TOP Meteo
7. Buderus Logamax U072-12K
This boiler has a closed combustion chamber, is perfect for any heating system in a private home, and is very convenient to control. It looks very attractive. The case is made of thin-sheet stainless steel, the assembly is reliable, there are absolutely no backlashes. Initially, the device was developed exclusively for difficult climatic conditions.
The control system is based on the Open Therm protocol: it is very reliable, exactly fulfills all user requirements, the settings are fine, down to the degree, which cannot but affect the efficiency of the device. It more than covers household needs - one such boiler is enough to create a heating system in a house with an area of about 120 square meters. The boiler is a double-circuit, flow-through type, and produces about 12 liters of water per minute - this is quite enough for a family of three to four people or three water distribution points.
Advantages:
- Small overall dimensions;
- Light weight;
- Excellent withstands significant voltage drops: up to 30% up or down;
- Does not fade when gas supply decreases;
- Has frost protection systems;
- Makes virtually no noise during operation;
- Piezo ignition;
- The size of the flame is regulated by the ionization electrode;
- Well suited to the Russian climate.
Flaws:
- The hood fan quickly fails;
- The pump power is often insufficient when there is a second floor;
- Flimsy feed tap.
Buderus Logamax U072-12K
6. Viessman Vitopend 100
This design can be chimney or turbocharged. The first is allowed to be connected to a central chimney, which creates natural draft to remove combustion products. The turbocharged device is intended for installation in rooms where there are no special exhaust systems. All waste here is removed outside the building using a special fan.
The boiler body is made of reliable stainless steel, the assembly is reliable, there are no backlashes. Equipment power ranges from 10.7 to 23 kW. The heating system can reach a pressure of 3 bar. Inside the boiler there is an expansion tank with a volume of 6 liters. The coolant warms up to a temperature of 85 degrees, hot water - up to 57 degrees. DHW capacity is no more than 11 liters per minute depending on the temperature.
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On the front panel there is a liquid crystal display, a power button, a pressure gauge and two levers responsible for the temperature of the coolant and water. Additionally, you can purchase a room thermostat, which facilitates the operation of the unit.
Advantages:
- Made exclusively from high quality materials;
- Does not make noise during operation;
- Small overall dimensions;
- Only modern technologies are used in production.
Flaws:
- High cost;
- High price for components and spare parts;
- Hydraulic tubes are made of composite materials, which is why they can quickly fail.
Viessman Vitopend 100
5. Navien DELUXE 16A White
This is a fairly good wall-mounted boiler, which is characterized by high-quality assembly and a long period of operation. The device is a dual-circuit type and can withstand low temperatures well, largely due to the presence of a freeze protection system. The circulation pump automatically turns on when the room temperature drops to 10 degrees and begins to intensively distill the coolant, preventing it from freezing. When the water temperature level in the system drops to 6 degrees, the burner turns on, increasing this indicator to 21 degrees.
Gas is consumed quite economically, which has a positive effect on the service life of the heat exchanger and the boiler itself. The device is able to operate even at a minimum gas pressure of 4 mbar. The unit can withstand serious voltage drops in the network and operates stably when the water pressure in the system drops. The kit comes with a remote control and there is also a voice assistant. Under the front panel there is a control unit equipped with a digital monochrome display.
Advantages:
- Well withstands changes in water, gas and voltage;
- Reasonable cost;
- Convenient control using a remote control or a block on the panel.
Flaws:
- In some cases, the automation fails;
- Weak hot water pressure;
- Makes a lot of noise during operation;
- There is no automatic diagnostic system for the device.
Navien DELUXE 16A White
Bosch Gaz 6000 W WBN 6000-24 C
Designed to heat a room up to 240 square meters, the boiler is equipped with a closed combustion chamber and a plate-type heat exchanger. It is capable of producing about 11.5 liters of hot water per minute, combustion products are discharged outside the room using a coaxial chimney with a diameter of 60/100 mm.
The control unit contains sensors that monitor the flame size, are responsible for automatic ignition, and fan rotation speed. The boiler is also equipped with a three-stage pump and a 6.5-liter expansion tank.
The body is rectangular, on the front side there is a control panel equipped with a liquid crystal display, a pressure gauge showing the pressure in the heating system, and several adjustment buttons. All pipes for connecting communications are located at the bottom, which ensures ease of installation.
Advantages:
- Quickly warms up the room air;
- Installation is easy;
- High efficiency, low gas consumption;
- A large number of individual settings;
- There is a piezo ignition.
Flaws:
- Sometimes it produces atypical errors - to eliminate them, just disconnect the boiler from the network for a couple of minutes;
- The circulation pump vibrates strongly during operation;
- Condensation sometimes forms in the differential relay tubes.
Review of the BOSCH wbn 6000-24c Gas Boiler
Bosch Gaz 6000 W WBN 6000-24 C
NAVIEN Ace-24A Atmo
This is a wall-mounted boiler for a home or apartment, which is perfect for even the harshest climatic conditions. It has good economic indicators, can last for quite a long time, can easily withstand low pressure of water and gas, and ensures stable operation even with significant voltage drops.
Despite all these positive qualities, the device is not too expensive. The boiler assembly is reliable, there is a heat exchanger with good performance, due to which hot water is provided literally a few minutes after turning on the boiler.
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The pipes are located on the sides of the body, so the piping can be done both on the left and on the right side, thanks to which installation can be carried out even in rather cramped conditions. The new generation gas burner ensures silent operation of the boiler.
Advantages:
- Good level of security;
- Small overall dimensions;
- Easy to use;
- Acceptable price.
Flaws:
- The circulation pump is a little noisy, but otherwise the boiler is perfect.
Navien ace 24.avi
NAVIEN Ace-24A Atmo
Baxi MAIN 5 24 F
Italian equipment of high quality, which rightfully takes third place in our ranking of the best wall-mounted gas boilers. It is a two-circuit mounted boiler, equipped with a closed combustion chamber, turbocharged. The equipment is designed to be connected either to a coaxial chimney or to a two-pipe system for removing combustion products. The device consists of a gas burner, the nozzles of which are made of stainless steel, and a bithermic heat exchanger.
The Grundfos brand circulation pump is equipped with an automatic air vent; electronic automation is concentrated on a special board. The volume of the expansion tank is 6 liters. In addition, the boiler is equipped with several sensors: heating, hot water, draft, flame level. The maximum power of the unit at the highest loads is 24 kW, it is designed for reliable heating of a house with an area of up to 220 square meters. It has small dimensions - 700*400*280 mm.
For ease of control, the boiler is equipped with a liquid crystal monochrome display and several buttons responsible for adjusting the temperature of the coolant and hot water; an automatic equipment diagnostic system is provided; if errors are detected, their codes are displayed on the display.
Advantages:
- All necessary functions are provided;
- Small sizes;
- Reasonable cost;
- A large number of service centers.
Flaws:
- The electronic board does not tolerate voltage surges well, so it is best to connect the boiler through a voltage stabilizer;
- The maximum power of the equipment is 24 kW.
BAXI MAIN5 GETTING TO KNOW
Baxi MAIN 5 24 F
1. Protherm Cheetah 23 MTV
A fairly popular wall-mounted gas boiler that can be used in both private and apartment buildings. It has high performance and reasonable cost. The device is equipped with a closed combustion chamber, making it absolutely safe to use. Thanks to this functional element, the unit can be installed in any type of room, even one not equipped with a chimney. Combustion waste is removed using a coaxial system.
The assembly of the device is of high quality: the body is made of high-quality stainless steel, the service life is long, but the initial setup, like other boilers, must be carried out by an authorized specialist. The equipment is convenient to operate and has a high efficiency of more than 94%. There are several heating modes: holiday, winter, summer.
The design has an automatic air valve that removes excess air from the heating system, frost protection is provided, and there is a system responsible for the size of the flame and draft.
Advantages:
- Ease of installation and operation;
- Does not make noise during operation;
- Preventive inspections should not be performed too often.
Flaws:
- There is no service documentation;
- The circuits depend on each other - if hot water is turned on, heating of the coolant stops.
Protherm Cheetah 23 MTV
Which company should you choose?
Leaders in the Russian gas equipment market:
- Vaillant (Germany) . It produces boilers with both open and closed combustion chambers; condensation and convection. The units operate on natural and liquefied gas and are controlled by intelligent automation. Disadvantages: high cost and expensive maintenance.
- Buderus (Germany) . Produces boilers with high efficiency (95-109%) and heat exchangers made of cast iron. The units are easy to operate. Disadvantages: energy dependence.
- Viessmann (Germany) . A wide variety of models with efficiency of 93-105%. The equipment is environmentally friendly and operates silently. Disadvantages: high price and expensive service.
- Ariston (Italy) . The range includes models with electronic and manual control. Heat exchangers are made of copper. The disadvantage is the noise when the boilers operate.
- BAXI (Italy - Russia) . Huge selection of models. Boilers in heating mode support the “warm floors” function. Disadvantage: automation is sensitive to the quality of power supply.
- Navien (South Korea) . Models adapted for Russia. There are boilers with Russian-language menus. They are cheaper than their European counterparts. The disadvantage is that the remote controls are short-lived.
- Lemax (Russia) . Simple models with protection against scale and corrosion. Italian automation is used to control the burners. Affordable price and affordable service. Disadvantage: minimum functionality.
The best wall-mounted condensing-type gas boilers
Gas boilers of the condensing type are more economical and productive. Their efficiency often exceeds 100%. But at the same time, condensing devices have a higher price. Experts have identified several modern models.
Vaillant ecoTEC pro VUW INT IV 236/5-3 18.5 kW dual-circuit
Rating: 4.9
Reliability and performance helped the German boiler Vaillant ecoTEC pro VUW INT IV 236/5-3 become the winner of our review. Experts appreciated the innovative Aqua-Condens technology, thanks to which excess heat from exhaust gases is reused to heat the coolant and water. As a result, the efficiency of the device reaches 109%. The dual-circuit model is able to solve the problems of heating and hot water supply, economically consuming natural (2.5 cubic m/h) or liquefied (1.8 kg/h) gas. Both heat exchangers are made of stainless steel.
Domestic users did not find any disadvantages with this model, positively noting the lightness (33.4 kg) and compactness. The device quickly heats the water, and special sensors quickly respond to interruptions in gas supply.
Advantages
- record efficiency;
- efficiency;
- light weight;
- safety.
Flaws
- not detected.
Buderus Logamax plus GB172-42 i 41.9 kW single-circuit
Rating: 4.8
The German single-circuit gas boiler Buderus Logamax plus GB172-42 looks very impressive. The appearance of the device has a fascinating effect on potential buyers, who sometimes forget about the high price. Experts appreciated the high thermal power (41.9 kW) and the off-scale efficiency (109%). The model is equipped with a circulation pump, an aluminum heat exchanger, and a display. Thanks to electronics and the ability to connect external controls, consumers will receive maximum operating comfort.
Russian users praise the stylish design, high heating efficiency, and convenient operation. Disadvantages include high price and difficulty connecting. There are no special air ducts for the boiler on sale.
Advantages
- spectacular appearance;
- high efficiency;
- fast heating;
- comfortable control.
Flaws
- high price;
- connection difficulties.
Ariston GENUS PREMIUM EVO 24 FF 22 kW dual circuit
Rating: 4.7
The double-circuit Italian boiler Ariston GENUS PREMIUM EVO 24 FF is quite a bit inferior to the leaders of the review in such an indicator as efficiency (108.1%). At the same time, it looks more attractive in terms of affordability. The model has decent power (22 kW), it is equipped with an expansion tank, a built-in pump, an air vent and a safety valve. The device consumes natural gas economically (2.33 cubic m/h), and is easily installed in a heating system. The gas boiler gets bronze in our review.
Expensive maintenance and repairs prevented the Italian device from rising higher. The boiler has earned praise from users for its reliability and ease of use. The owners are satisfied with the efficiency, stylish design and affordable price.
Advantages
- high efficiency;
- acceptable price;
- good equipment;
- ease of use.
Flaws
- expensive maintenance.
BAXI LUNA Platinum+ 1.24 26.1 kW single-circuit
Rating: 4.6
The Italian boiler BAXI LUNA Platinum+ 1.24 has the lowest price. This single-circuit unit is inferior to the review winners in efficiency (105.7%) and efficiency (natural gas - 2.61 cubic m/h, liquefied gas - 1.92 kg/h). The heat exchanger is made of stainless steel, the model is also equipped with a built-in expansion tank and circulation pump. Experts note the convenient electronic control, low weight (34.5 kg) and compactness of the boiler. The manufacturer has provided the possibility of connecting underfloor heating and external control.
Users are satisfied with the rich equipment, level of security, and quiet operation. The disadvantages of the model include weather-dependent automation and high gas consumption.
Advantages
- low price;
- convenient control;
- lightness and compactness;
- rich equipment.
Flaws
- weather-compensated automation;
- high gas consumption.
Principle of operation
Gas boilers are either convection or condensation.
In devices of the first type, a gas burner heats water in a heat exchanger, and it circulates in the system. Condensing boilers are more complex. They have an additional heat exchanger in which the energy of the exhaust gases is accumulated.
See the table for the pros and cons of both types.
| Gas boiler type | Convection | Condensation |
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Double-circuit or single-circuit boiler: which is better?
Double-circuit boilers, despite their functionality and ease of use, are not always better than single-circuit models. They have technical power limitations of 50 kW and are suitable for installation in small houses inhabited by a family of 2-3 people.
Double-circuit boilers will not cope with the “Warm floor” system, heating several floors and high-quality hot water supply.
In large cottages, where there are several bathrooms, gas heating units with an external boiler of 800-1000 liters will cope better. Also keep in mind that if a double-circuit boiler breaks down, you will immediately be left without heating and hot water.
