Wall-mounted single-circuit gas boilers and their varieties

Operating principle

Single-circuit installations operate on the principle of flow heating of the coolant using a gas burner. The process takes place in the heat exchanger, which receives the return flow from the heating circuit.

Receiving the maximum temperature, the liquid leaves the heat exchanger and enters the three-way valve. In it, a colder return is mixed with a hot stream in order to create the temperature set by the mode.

The prepared coolant exits the boiler with the help of a circulation pump and is sent to the heating circuit for the next circulation cycle. The circulation pump is responsible for moving the liquid, and the turbocharger fan is responsible for the air supply and smoke exhaust.

The control over the operation of the unit is carried out by a self-diagnostic system (sensors, thermistors) connected to the electronic control board.

All arising problems are displayed on the display in the form of a special designation of a particular error.

Characteristics of heating boilers

The main technical characteristics of a wall-mounted gas boiler include:

• Power. The single-circuit model does not have much power. To determine the key parameter, a formula is provided: 1 kW of boiler power is designed for heating 10 square meters. m of premises. For a double-circuit boiler, the planned volume of hot water consumption must be added to this formula.
• Gas consumption (depends on the power of the unit, the more powerful it is, the more gas is consumed). To calculate the consumption for 1 hour, you need to multiply the power of the device by 0.12 m³.
• Type of burner, distinguish between inflatable, atmospheric and diffusion-kinetic.
• Heat exchanger material (copper, steel, cast iron).
• Type of coolant (regular liquid or with the addition of antifreeze).
• Type of traction (forced, natural).
• Type of ignition, distinguish between piezo ignition and electric ignition.
• The size. The height of the boiler varies from 65 to 85 cm, and the weight is not more than 30-40 kg.
• Performance. The volume of water heated to a certain temperature in 1 minute is calculated.

Installing on a wall surface will save a huge part of the living space.

Tips for choosing a boiler, taking into account the manufacturer

If you are thinking about the question of how to choose the right double-circuit gas wall-mounted boiler, then you should also pay attention to the manufacturers. One of the market leaders is Vaillant, which operates in Germany. Its dual-circuit VUW models can have an open or closed combustion chamber.

The equipment is equipped with protection against freezing, jamming of the running diverter valve and pump.Experts emphasize that an important advantage of these devices is the presence of a mode using partial power. You can use the control of the technical condition, operate the electronic ignition and monitor the operation of the unit using the LCD display. For the Russian consumer, a sensor system isolated from the frame is installed on the boilers of this supplier. There is an analog pressure gauge in the devices, and for one such unit you will have to pay an amount ranging from $ 1100 to 1600

Its dual-circuit VUW models can have an open or closed combustion chamber. The equipment is equipped with protection against freezing, jamming of the running diverter valve and pump. Experts emphasize that an important advantage of these devices is the presence of a mode using partial power. You can use the control of the technical condition, operate the electronic ignition and monitor the operation of the unit using the LCD display. For the Russian consumer, a sensor system isolated from the frame is installed on the boilers of this supplier. There is an analog pressure gauge in the devices, and for one such unit you will have to pay an amount ranging from $ 1100 to 1600.

If you choose a gas double-circuit wall-mounted boiler for your home, then you should also pay attention to the German manufacturer Viessmann. According to experts, the efficiency of the boilers in this case reaches 93%. The equipment can be adjusted according to the room temperature

Another plus for professionals is the quick connectors, which simplify installation. Some models do an excellent job of working in the conditions of Russian heating systems.The average price for such equipment is somewhat lower than in the above case, and varies from $650 to $1200

The equipment can be adjusted according to the room temperature. Another plus for professionals is the quick connectors, which simplify installation. Some models do an excellent job of working in the conditions of Russian heating systems. The average price for such equipment is somewhat lower than in the case described above, and varies from $650 to $1200.

How to choose?

In order to correctly select a wall-mounted gas boiler that will not disappoint you during operation, it is recommended to decide on a few nuances.

• First of all - how much hot water do you need, how many people will use the water, is there a need to turn on several sources of water at the same time, such as a shower or a kitchen faucet.
• The required volume and power of the gas boiler, which depends on the heated room.
• Type of heating system. What type of circulation is required: forced or natural. The latter type does not require an additional purchase of a pump.
• your financial possibilities. The quality of the purchased equipment and components will depend on the budget you are willing to spend.
• The level of comfort depends on whether the equipment will have a remote control system or not.
• The manufacturer or brand of the equipment being purchased.

For example, for fragile foreign equipment, it is mandatory to purchase a voltage stabilizer, and some models, in principle, are not intended for the use of domestic hard running water.

It is most economical to put a turbocharged version in your house. Its repair will not be very frequent. And also it is easy to attach it to the pipes in the corner of the corner kitchen.

The best wall-mounted gas heating boilers

This is an ideal solution for small spaces, because the equipment does not take up much space. It is compact, looks neat and easily fits into any interior. But, unlike floor models, the power here is somewhat less.

Buderus Logamax U072-24K

This is a wall-mounted gas boiler, in which, first of all, stable combustion thanks to the impulse tube is worthy of attention. The reviews indicate that it maintains a comfortable temperature, regardless of the level of gas pressure (from 9 to 30 mbar). Convenient is the ability to adjust the heating rate of the room by selecting one of the three modes of operation of the pump. Even with the largest noise, there is practically no noise (the threshold does not exceed 39 dB). The user will always be aware of the current state of the system due to the illuminated display. The most thought out electrical connection. The water is also heated up to 60 °C.

Advantages

• Silent;
• Convenient display;
• Optimization for the Russian market;
• Economical;
• Easy to operate;
• Compliance of the actual efficiency with the declared one;
• Frost protection.

Flaws:

• In severe frosts, it may malfunction.
• There is a marriage of the control board;
• Big weight.

You can download the user manual here.

The average price is 38 thousand rubles.

Leberg Flamme 24 ASD

This is a fairly powerful heater (22.5 kW), it is able to heat an area up to 178 m2. The type is double-circuit, so it can be used not only to increase the air temperature from 40 to 80°C, but also to heat water up to 65°C.A rather large 6-liter expansion tank avoids a catastrophic increase in pressure in the system. The device has a powerful pump for operation in the "warm floor" mode. The safety system is well thought out here in case of a pressure drop, at which the gas simply stops being supplied to the burner. Critical water overheating is also excluded thanks to the temperature sensor.

Advantages

• Self-diagnosis;
• Opportunity to work from butane or propane;
• Two modes - for summer and winter;
• Good frost protection system;
• Can be used in the "warm floor" mode;
• Compatible with room thermostat;
• Intuitive control panel.

Flaws

• Often freezes without responding to any actions;
• The front panel is difficult to remove;
• Sometimes it turns off and gives an error;
• Possible overheating of the coolant.

Here is a detailed instruction manual.

The average price is 28,600 rubles.

Bosch Gaz 6000 W WBN 6000-24 C

This is another popular double-circuit wall-mounted convection-type heating boiler. It needs liquefied or natural gas as fuel, it works stably at a power of 7-24 kW, even with pressure drops in the water supply. The tank here is larger than in the Leberg Flamme 24 ASD, its volume is 8 liters. The control is fully electronic, the ignition is automatic, which facilitates operation. The auto-diagnostic mode allows you to do without a specialist in case of minor breakdowns. The thermometer notifies you of the heating of the air in the room. Weight, as for a wall model, average - 32 kg. The model is adapted to Russian operating conditions.

Advantages

• Works fast;
• Easy setup;
• Small size;
• Silent operation;
• Good choice of capacities;
• High efficiency.

Flaws:

• Sometimes adjustment boards “fly out”;
• Difficulties in repair;
• Marriage is common;
• Condensation quickly accumulates in the relay tubes, which causes an error;
• The warranty does not always apply.

Read the operating instructions for the Bosch Gaz 6000 W WBN 6000-24 C gas boiler here.

The average price is 33,000 rubles.

Calculation of gas consumption for a one-room apartment

For heating 10 squares, 1 kW of boiler power is needed. To get 1 kW of thermal energy, you need to burn 0.1 m³ of gas per hour. I have 40 square meters of odnushka, I will use autonomous heating for the first time: 4 kW * 0.1 m³ = 0.4 m³ / hour.

Let's roughly estimate that there will be 3 really cold months, and 4 off-season months, then for 90 days the boiler will oil at full and 120 days at half strength. We consider the gas consumption per day for the cold months: 4 x 0.1 x 24 ≈ 10 m³, in the off-season ≈ 5 m³. The entire heating season: (10 x 90) + (5 x 120) = 1500 m³.

Add to this figure the consumption of hot water. My super-economical family of 2 people uses about 2 cubic meters of gas per month, we use mostly cold water in the kitchen. I think for the heating season: 2 m³ x 7 months = 14 m³. Cooking takes about 4 m³ of gas, we cook more often in a slow cooker, there is no gas oven: 4 m³ x 7 = 28 m³. We get this figure for the heating season: 1500 + 14 + 28 = 1542 m³, rounded up to 1600 m³, just in case.

The gas tariff for the heating season (2015, Ukraine) is UAH 3.60 per m³ at a flow rate of no more than 200 m³ per month, or $0.16. If you cross the line of 200 m³ in a month, the rest of the cubes cost UAH 7.19. Presumably I will pay for the heating season: 1600 m³: 7 ≈ 229 m³, (200 m³ x 3.6) + (29 m³ x 7.19) ≈ 930 UAH, $40 per month, or 930 x 7 = 6500 UAH, $280 per season .

Judging by the gas consumption of normal people (collected data on online forums), my calculations are still quite modest. And it's depressing. Outside the benefits for the heating season, and this is 5 months a year, the tariff is 7.19 per m³. My 6 m³ cost UAH 43 ≈ $2.

The question arose - will water heated by an electric boiler cost less than gas? At least outside the heating season? Let's count.

Which boilers have the best efficiency?

As our practice shows, a rare brand writes the truth about the efficiency of its boilers. And here's an example for you:

We have a gas boiler of the Hearth brand from the ServiceGas plant. We study the technical characteristics and see that the efficiency of their Ochag Standard boiler is 92%:

It’s just good, we think, and we go to study similar boilers and stumble upon one of the best Baxi Slim floor boilers today. We look at the efficiency and see the value of 90%.

Takes pride in the country! Our boilers are 3 times cheaper, and the productivity is also a couple of percent higher!

What is important for you to know about boiler efficiency? For wall-mounted boilers, the efficiency will always be higher than floor-mounted ones. It fluctuates around 92-93%

All wall-mounted boilers have similar efficiency. The ceiling has been reached for a long time and the difference usually differs in hundredths of a percent.

The maximum efficiency of the floor boiler is 90%. No other brand has been able to achieve a higher figure. And such an indicator is usually available only for expensive brands.

Additional useful functionality

It is very difficult to choose a boiler according to the “which one is better” principle - it is better to focus on useful functions that will make the operation of the wall-mounted unit easier. Let's see what else should be in modern boilers:

• Smooth ignition - provides a silent start, without roar and pops, as old heating units can do (especially if they are built according to the igniter scheme);
• Self-diagnosis is a great thing that allows you to quickly figure out what happened to a single-circuit gas boiler. This information is useful not only to users, but also to specialists;
• Built-in boiler - prepared hot water will be stored here;
• The ability to work on liquefied gas - relevant for buildings that are not connected to gas mains;
• Frost protection - this function allows you to maintain a temperature of +5 degrees in the heating system, preventing the building from freezing.

It is welcome to have the opportunity to work according to a given program - this ensures economical gas consumption.

Kinds

Manufacturers produce a wide range of wall gas single-circuit boilers. To choose the optimal model of the device, you need to take into account all the design and thermal characteristics of each option. Depending on the features, boilers are classified into several types.

Atmospheric apparatus

This is the classic version. In another way, they are called convection or boilers with an open combustion chamber. To maintain a long combustion process during heating, air enters the apparatus from the room. Combustion products naturally go through the upper chimney. This type of boiler is mechanically controlled. For this, temperature regulators and a built-in thermocouple are provided. With the help of a piezoelectric element, the burner is manually ignited.

The main advantages of such schemes are:

• ease of use due to the absence of unnecessary details;
• low noise level (in this case, only the flame and the circulation pump, if any, form noise);
• affordable price (compared to other types of units).

Significant negatives include:

• the need for good ventilation;
• low efficiency of the mechanism;
• unstable combustion of fuel;
• the need for a traditional chimney.

Appliances with a closed combustion chamber

The principle of operation of such devices is based on forced air intake and smoke emission. They are equipped with variable speed fans and turbines to help circulate air and exhaust gases.

This type of boilers is classified, in turn, into two groups:

• turbocharged;
• condensation.

Turbocharged gas boilers are modern models of heating equipment. Their principle of operation is based on closed combustion chambers. Due to the presence of adjustable fans and turbines, there is no need to organize conventional chimneys and the presence of a good ventilation system in buildings. To ensure the optimal functioning of turbocharged equipment, it is necessary to take care of special devices. These are coaxial or chimneyless elements. Each of them consists of a pair of pipes, one of which is inserted into the other. Atmospheric air enters the system through one pipe, and exhaust gases exit through the second.

Condensing units have improved technical characteristics. The principle of operation of such equipment is based on the condensation of the generated heat. Among the positive qualities, high efficiency (up to 109%) and economical fuel consumption can be noted.When using liquefied gas, costs are reduced by more than 40%.

Classification by used burner type.

• A single-stage burner is available in all non-volatile gas boilers. The burner device begins to heat the heat agent as the combustion mode is switched on. The devices are equipped with a stable working igniter.
• The two-stage burner device can operate in two modes (with 30% and 100% power). The advantages include a significant reduction in fuel consumption due to the possibility of smooth power switching. The burner device works stably, when the liquid is heated to the optimum temperature, the burner performance decreases to 30% automatically. The burner is ignited electrically. The change in productivity is controlled by electroautomatics, which means that two-stage devices are volatile.
• Modulating devices can work by changing the power from 10 to 100%. The combustion process is controlled by microprocessor automation. The performance varies depending on the parameters of the heating system (when heating the heating agent, changing the pressure in the gas pipeline). The advantages include the most economical gas combustion and minimal fuel underburning.

Notable Manufacturers

Good reviews have Japanese appliances, as well as equipment made in Italy. Their rating is pretty high.

Brands such as Bosch, Viessmann, Beretta, Baxi are heard by many people.But it is also worth noting the affordable products from the company "Danko" ("Agroresource"), and therefore there is a huge demand for it. And the Daesung brand from Korea, which has recently enjoyed great popularity among consumers. What is the difference between the above listed brands, what are their strengths and weaknesses, we will understand in detail.

When talking about the German manufacturer of wall-mounted boilers Bosch, the word quality immediately comes to mind. Indeed, it is this criterion that determines all products manufactured by this brand, which, by the way, has been operating for more than twenty years. And if you follow the recommendations for the operation of a wall-mounted boiler, it will serve you much longer than the declared warranty period. The Bosch boiler is distinguished by a built-in self-diagnosis system and automatic settings. For example, when the fire flame disappears in the burner, the gas is automatically turned off. The boiler operates from natural or reduced gas. The heat exchanger is made using a material such as copper, which is subsequently coated with a thin layer of oxide to help protect the wall-mounted boiler from corrosion. The equipment has a compact size and fits perfectly into almost any interior. It is possible to place the boiler even in a hinged kitchen cabinet.

Thanks to the Viessmann brand, the wall-mounted boiler has acquired several modifications. Namely: the equipment can be both single-circuit and double-circuit. The improved chimney and its internal design does not allow ice to form on the surface of the equipment. The compactness of the boiler allows it to fit a membrane expansion tank of six or even ten liters. Wall gas boiler from Viessmann brand will delight you with the quality and efficiency of ninety-three percent.

Italian manufacturers, one of which is the notorious Beretta, are distinguished by high build quality and equipment power from twenty-four kilowatts. A wide range will surprise even the most selective consumer. Beretta produces single-circuit and double-circuit boilers, with and without a boiler. The built-in boiler of sixty liters, thanks to the expansion tank, can increase the volume.

The wall-mounted gas boiler from the Italian brand Baxi stands out among other equipment for the presence of an atmospheric burner, which makes the operation of the device almost silent. The heat exchanger is made using bithermic technology. Power varies from ten to eighty kilowatts. The compactness of the equipment produced by the brand allows the products to be in great demand among the consumer. The declared efficiency is ninety percent. The warranty period is seven years.

The wall-mounted gas boiler, made in Korea under the Daesung brand, does an excellent job of heating the living space. The strength of this device is the heat exchanger, one part of which is made of copper alloy, and the other part is made of steel plate. Thanks to this design, the water heats up instantly. The built-in stabilizer operates from one hundred and fifty to two hundred and eighty volts. In addition, the boiler has protection against overheating, hypothermia, gas leakage and sudden pressure surges. The equipment can be operated with a remote control.

From domestic products, the aforementioned Danko brand can be noted. Wall-mounted boilers differ from foreign counterparts in energy dependence.However, the climate in Russia and all kinds of power outages make this feature a huge plus for the Russian consumer. Separately, it is worth noting the quality and durability of the equipment. The only drawback of Danko wall-mounted boilers is the need to purchase additional components: a pump, a regulator and an expansion tank.

Conclusions and useful video on the topic

Video #1 How to choose the right gas boiler:

Video #2 How to select a gas-type heater, based on the declared power:

Video #3 Which floor boiler is best for a cottage:

It is essentially impossible to give unequivocal advice which gas boiler is better to buy. The heater for hot water supply and the heating system for each particular dwelling must be selected individually. And this should be done only on the basis of the calculations of a competent heat engineer, taking into account all the nuances.

There are a lot of criteria and subtleties in choosing a boiler. Before you go to the store, you should carefully study everything, but it is better to consult with a specialist in this field.

Do you want to share useful tips in selecting and buying a gas boiler? Do you have your own thoughts and experience in operating the unit? Did you find any flaws in the submitted material? Please write comments in the block below the text. Communication will help to quickly clarify difficult points.