Among the European leaders in the production of heating equipment,] Viessmann [/ anchor] stands out.
Founded over 100 years ago, it has accumulated significant theoretical and technological background.
This allows the creation of exemplary installations for heating and supplying hot water both to residential and public or industrial premises.
The quality and operational capabilities of Viessmann gas boilers are highly appreciated by both specialists and ordinary users.
For use in residential apartments or houses, two-circuit models are made that can not only heat rooms, but also prepare hot water for domestic needs.
Double-circuit gas boilers Viessmann
Double-circuit (combined) boilers have two functions performed simultaneously - heating the coolant for the heating system and preparing hot water for household needs.
As a rule, the power of double-circuit boilers is relatively low, up to 34 kW, which corresponds to the size of residential buildings, apartments or office premises of small and medium size.... This has its own calculation - the higher the power of the boiler, the greater the volume of hot water it must cook.
However, the heating of the DHW flow in the unit is produced by a plate secondary heat exchanger, whose capabilities are limited, and it is not able to provide high performance.
Therefore, powerful Viessmann boilers are single-circuit, but they have the ability to connect an external indirect heating boiler, whose performance is much higher and is able to meet large DHW needs.
Installation and operation
Installation, start-up and adjustment of gas heaters are carried out by specialists, especially when it comes to such high-tech equipment as Visman. The nuances of installation depend on the type of device:
- Open firebox. The combustion products are discharged through a corrugated stainless steel pipe. Its diameter should not be less than the diameter of the heater connector. Atmospheric burners use room air, therefore supply ventilation must be installed.
- Closed firebox. Turbocharged versions do not require fresh air ventilation - combustion air is supplied from the street via a coaxial pipeline.
Coaxial chimney is optional. Some stores sell them without certificates - such chimneys are of interest to the gas services, which then results in a monetary fine. When purchasing this item, be sure to be interested in the certificate. Another installation condition is that there must be a free space above the device - at least 40 cm.
Advantages and disadvantages
The advantages of Viessmann double-circuit boilers include:
- Full functionality of the units, which makes it possible to heat housing and supply hot water.
- Compactness, attractive appearance. As a rule, double-circuit boilers are installed in the kitchen, where they do not interfere and do not take up much space.
- Full automation of work, only minimal adjustments to the operating mode are required from the user.
- The presence of a self-diagnostic system that detects and signals the occurrence of malfunctions.
The disadvantages of Viessmann double-circuit boilers can be considered:
- The boiler performance on the DHW line is limited, with an active drawdown, the temperature drops both in the DHW system and in the heating circuit.
- The design of double-circuit boilers is more complicated, which increases the risk of failure of individual elements.
- The volatility of the units makes it possible to stop heating and hot water supply in the event of a sudden power outage.In addition, it is necessary to use a voltage stabilizer, which excludes the failure of the control board in case of a sharp voltage surge.
The disadvantages of double-circuit boilers are the same for all units from any manufacturer, so they can to some extent be considered design features.
Description of the Viessman double-circuit boiler
Possessing a number of advantages, having a sufficient range of products, gas boilers of the German company are becoming more and more popular in Russia.
Recently, the company has relied on Viessmann wall-mounted double-circuit gas boilers, which are compact and economical.
It is not surprising that you rarely find reviews of such devices. This is due to the fact that German heating equipment is not intended for the budget buyer. Boilers do not attract ordinary buyers for their price. But their quality justifies its cost.
Devices are divided by type into 1-o and 2-contour:
- The former heat only the room (there is only 1 water inlet and 1 outlet). They are very simple and practical to use.
- The second, double-circuit, in addition to heating, heats water for all kinds of needs. The design has 2 auxiliary pipes through which cold water enters and hot water exits. The only drawback is that it is impossible to simultaneously use both circuits.
If the system has low water pressure, it is worth choosing a single-circuit device and installing a boiler. Read about the pros and cons of double-circuit and single-circuit boilers at the link.
Heating devices are also divided according to the chamber through which combustion products are emitted:
- Open chamber (so-called "atmospheric unit"): the chimney has a branch pipe from 130 to 140 mm.
- Closed chamber ("turbo boiler"): coaxial and separate chimney 80/80 mm, "pipe in pipe" type.
The functions of the heater are varied and controlled by specials. block, which is located on the outside of the case. With its help, the temperature setting is performed, the mode programming of the operation of the device takes place. If there are problems in the operation of the equipment or boiler control, the digital screen will always show an error code that can be corrected.
Views
All Viessmann double-circuit boilers are wall-mounted. Floor installations are single-circuit by default, although they have the ability to connect to an external storage or boiler.
They are equipped with an atmospheric type partial mixing burner, which is able to flexibly regulate the amount of gas by partially mixing air.
There are two design options:
- Convection boilers... They work according to the traditional method, heating the coolant and giving it to the heating system without additional procedures.
- Condensing units... They appeared relatively recently. The peculiarity of these installations consists in the preliminary heating of the coolant with the help of thermal energy obtained during the condensation of water vapor from the discharged gaseous combustion products. Designed to work in low-temperature systems - underfloor heating, etc.
NOTE!
The efficiency of condensing boilers, declared by manufacturers, is up to 108%, which is impossible in practice and is a common marketing ploy. It is determined by adding the boiler efficiency and the maximum efficiency of the condensing chamber, which is incorrect from a theoretical point of view.
How does it work?
The gas apparatus must be installed so that vibration and heat are excluded. After installation, the connection begins - to the power grid, to water and gas pipes. The principle of operation of the atmospheric apparatus:
- Oxygen enters from the room, and the exhaust gases are discharged through the chimney.
Turbocharged versions work differently:
- They don't need a chimney. The gases are discharged horizontally by means of coolers. The fan not only removes combustion products, but also supplies air from the street for combustion.
What series and models belong to double-circuit
Viessmann double-circuit boiler models are designated A1JB.
Among the entire product range, there are two series:
- Viessmann Vitopend. They represent a model line of convection boilers with a capacity from 10.5 to 31 kW. The most popular models are boilers with a capacity of 24 and 31 kW, which is explained by the optimal match between their parameters and the needs of a medium-sized private house. Their efficiency reaches 90-93%, the feature of installation is the possibility of installation in a narrow compartment - there is no need to leave gaps on the sides, all maintenance is performed from the frontal plane of the boiler.
- Viessmann Vitodens. This is a series of condensing boilers. The Vitodens series is divided into three ranges, 100 W - from 12 to 35 kW, 111 W - from 16 to 35 kW and 200 W - from 32 to 150 kW. Models with a capacity of 24 kW are in the highest demand, although condensing boilers have specific operating conditions and are not always able to demonstrate full efficiency.
IMPORTANT!
There is the Vitodens 222-F series, which are floor-standing models with a power of 13-35 kW, equipped with an integrated storage water heater, which allows them to be classified as a double-circuit boiler.
Series Models
The Viessmann Vitopend 100-W series has two model lines:
- Single-circuit boilers, designated by numbers from 001 to 004.
- Double-circuit boilers are designated by numbers 009-012.
Numbers 001, 002, etc. indicate the boiler output.
Each model is marked with its own digital code:
- Number 001 is assigned to a 24 kW single-circuit boiler.
- 002 - single-circuit boiler, power 29.9 kW.
- 003 - power 34 kW.
Double-circuit boilers start from 009:
- 009 - 12 kW.
- 010 - 24 kW.
- 011 - 29.9 kW.
- 012 - 34 kW.
Codes 004 to 008 are assigned to ready-made solutions, sets of single or double-circuit boilers and external water heaters.
Digital marking is convenient in that it allows you to reduce long designations to three digits, with sufficient accuracy indicating a specific boiler model. It is convenient for both technical staff and retail chain employees, speeds up the identification of models and simplifies document flow..
Specifications
Consider the technical characteristics of Viessmann double-circuit boilers:
| Parameter | Value |
| Boiler type | Gas convection or condensing |
| Fuel type | Natural or LPG |
| Efficiency | 90-93%, stated value for condensing models - 108% |
| Number of contours | Two - heating and hot water supply |
| Power | 10.5-150 kW |
| Coolant pressure | Up to 3 bar |
| Heat carrier temperature | 35-70° |
| DHW temperature | 40-60° |
| Power supply | 220v 50hz |
Device
All double-circuit models are made of high-strength materials. The heat exchanger, gas burner and casing are made of high quality stainless steel that can withstand temperature and pressure changes. These are the main structural elements of boilers.
In addition to them, the assembly units include:
- Secondary stainless steel plate heat exchanger.
- Expansion tank.
- Circulation pump.
- Turbocharger fan (for models with a closed combustion chamber).
- Three-way valve.
- Gas valve.
- Control board with external panel and display.
- Self-diagnosis system (sensors installed on all parts and connected to the control board).
The coolant enters the primary heat exchanger and receives the maximum temperature there. At the outlet, it enters the secondary plate heat exchanger, where it partially gives off thermal energy for heating the hot water supply.
Then, in a three-way valve, it mixes with a colder return flow and receives the required temperature for supply to the heating circuit.
In condensation models, everything works the same, only before entering the primary heat exchanger, the liquid is partially heated in the condensation chamber, which allows to reduce the heating level and reduce gas consumption.
Device and features
Viessmann cares about the durability of boiler equipment - the heat exchanger of floor-standing models is made of high-strength gray cast iron, stainless steel is used in compact units. Burners and bodies are also made of high quality stainless steel.
Gas boiler device Viessmann
All units are equipped with a protective sound-absorbing layer inside the housing. This ensures acoustic comfort when operating equipment for heating a house or apartment, even if a model with a turbocharged burner is installed.
Single-circuit and double-circuit gas boilers are equipped with modulating burners, due to which the power of the unit changes depending on the needs for heat and hot water. This saves fuel. Viessmann boilers are designed for the use of mains and liquefied gas.
Special controller:
- allows you to control the boiler:
- diagnoses the condition of the unit's components and displays information on malfunctions;
- controls the heating level of the coolant and the equipment itself in order to exclude overheating;
- monitors the voltage in the power grid;
- controls the operation of the burner in order to exclude the supply of gas when the flame is extinguished.
Boiler units are equipped with temperature sensors that inform the control system about the temperature level in the heated rooms. This allows you to regulate the gas supply in automatic mode to maintain an optimal level of heating of the coolant and save fuel.
Connection and setup instructions
After delivery of the boiler, it is necessary to install it in a pre-selected and prepared place. Do not hang the units on plasterboard or other weak partitions, the wall must have sufficient bearing capacity.
After hanging, the chimney is connected and the gas and water supply pipelines and the heating circuit are connected.
The Viessmann double-circuit boilers are set up after installation and a complete check of the quality and tightness of the connections.
Particular attention is paid to the connections of gas pipes, checking them with soapy water... The gas and water pressure limits are set, the operating mode, current temperature and other parameters are set.
It must be borne in mind that all units are initialized at the factory, therefore, in most cases, no specific actions are taken.
All work on connecting and setting up the boiler must be carried out by a qualified representative of the service center. Unauthorized intervention may cause damage to the unit.
Download instruction
Download the instruction for the Viessmann double-circuit gas boiler.
The first stage before connection is installation
According to the instructions, the hydraulic piping of the boiler must be carried out at the stage of finishing work. Then the level is checked for the tightness of all the hydraulic connections you use, as well as the final installation of the heater itself from Wisman.
To simplify the maintenance of the systems, special mounting devices developed by German specialists are used:
· Mounting frame, providing reliable fastening of wall (suspended) models. This solution avoids the need to rework existing piping;
· Reinforcing covers that cover and protect the open connection;
· A hinged bar for easy fixing of the boiler to the wall.
The detailed instructions supplied with the Wiessmann heating technology guarantee you the exact execution of all installation steps. This ensures the durability of the equipment, the simplicity of its further operation and maintenance.
Price range
The cost of Viessmann double-circuit boilers is in the range of 38-56 thousand rubles. The price depends on the power of the selected model... In regions located at a significant distance from densely populated areas, the cost of equipment will be significantly higher, since delivery will require significant costs.
In addition, you will need to purchase a chimney, a voltage stabilizer, filtration units for water, without which high-quality operation of boilers will be impossible.
It is recommended to clarify the composition and cost of all additional components in advance so as not to find yourself in a difficult situation when purchasing.
Why Wisman boilers?
Today boiler heating is very popular, the market is full of various models of gas boilers from different manufacturers. There are both domestic and imported products on sale. The undisputed leader among the sales of gas boilers is the German company Wisman. Viessmann gas boilers are used not only in private buildings, but also in city apartments, offices and warehouses.
High consumer confidence in this brand is justified by the following product advantages:
- the body is made of stainless steel, resistant to corrosion;
- high quality. Achieved through the use of advanced technologies, modern high-quality materials, construction principles;
- functionality and reliability of work;
- profitability;
- the equipment is environmentally friendly: during operation, Viessmann gas heating boilers emit a minimum amount of substances harmful to the human body, the same which are released, are quickly processed by plants;
- the unit is high-tech and has a long service life;
- maximum efficiency;
- large power range;
- safety;
- ease of use;
- affordable cost.
All the advantages possessed by Wisman gas boilers are due to their universal design: the models have atmospheric or replaceable burners. Atmospheric ones are distinguished by a simple design, soundless operation and an acceptable cost. Replaceable burners provide more efficient heat transfer and can operate not only on liquid fuel, but also on gas.
In addition, it should be noted that the devices are equipped with a combustion sensor: if the flame is extinguished, the gas is shut off and no gas leakage occurs. Also, Visman gas boilers are equipped with a water filter and an option for automatic cleaning of the combustion chamber. It is these additional functions that guarantee safe and reliable operation.
