Gas wall double boiler: choice for home installation

You can achieve some independence from public utilities, if you install equipment such as gas wall-mounted double-pressure boiler, which solves the problem of heating and providing home autonomously functioning system DHW.

In the present article we have shown characteristics that you should pay attention when choosing the unit. We describe in detail the arrangement and design features of the gas bypass equipment. In order to facilitate the selection listed leading manufacturers segment.

The content of the article:

  • Wiring diagram for boiler with two circuits
  • Advantages wall double boilers
  • What to look for when choosing equipment?
    • Thermal power and performance
    • What heat better?
    • What are the combustion chamber?
    • Other important selection parameters
  • Overview of gas boilers manufacturer
    • Boilers Italian company BAXI
    • German quality Bosch Thermotechnology
    • Korea Gas Equipment Navien
  • Conclusions and useful videos on the topic

Wiring diagram for boiler with two circuits

The gas, which are connected urban homes, businesses and public institutions, is the most expensive fuel. Even with the paperwork and approvals in several instances the installation of gas boilers justified. Properly chosen model can serve and the heating system and the sanitary water supply.

The boiler is installed in an easy to access location. With proven in practice connection diagrams bypass gas unit will introduce the recommended article us. It is necessary to provide a secure, compliant installation corresponding gas pipe liner and output chimney for the transport of combustion products.

Wiring diagram wall double boiler

Wiring diagram wall double boiler. Yellow line - a natural gas supply, blue - cold-water, red - hot water, violet and pink - heating circuit

The boiler is fed cold water, after heating (at a certain temperature), it conveyed to the draw-off points, the main ones are the shower, bath, washbasin in the kitchen.

Plants in-house network - it is a closed loop with a circulating heat carrier servicing the system "warm floor", radiators, convectors and heated towel rail in the bathroom.

Consideration of delivery points

When choosing a boiler must take into account his performance as the dual-circuit equipment consumer class is not designed to service a large number of connected devices and vodorazdachi heating

An alternative model is the dual-mounting installation kit 1-circuit boiler + BKN where Indirect heating boiler It serves the hot water supply system. This scheme is good because it is always present in the taps hot water is the correct temperature.

set of disadvantages with boiler

boiler installation Less easily understood by the owners of houses and apartments with a deficit-free area. Another drawback concerns the cost of the kit with single-circuit boiler - it comes out more expensive than the double-pressure boiler

The dual-circuit models of heating and hot water do not overlap in the device which gives their bonuses. For example, as the coolant is used does not versatile filler - water, and the special solution.

Advantages wall double boilers

Saving space in a cramped apartment - this is just one advantage of boilers with two circuits (DC). There are a number of advantages that make it the wall of DC is selected as basic equipment for water heating and domestic organization of autonomous systems.

Here are a few reasons to buy 2-circuit wall Model:

  • this equipment, the maximum equipped for heating water and further its distribution not requiring additional devices;
  • DC can be installed in the entrance hall, equipped with windows or ventilation outlet, or kitchen, it does not require a separate room;
  • due to its compact size boilers are mounted in recesses or corners, camouflage in kitchen cabinets;
  • Automatic equipment allows to maintain the desired water temperature, which is not dependent on pressure or temperature of the air vibrations;
  • current models are characterized by high efficiency and economy;
  • one of the conditions in a building installation (flat) - low, comfortable for occupants noise level;
  • the cost of domestic models can be called moderate, the same applies to the service.

For modifications wall with closed combustion chamber equipped with a simplified variant of the chimney instead of the vertical passing through the roof, equip the coaxial versionOutputted to the outside through a nearby wall.

In apartment buildings smoke channel being constructed in the form of a bent knee from modular elements or corrugations and connects to Public chimney.

What to look for when choosing equipment?

Depending on the requirements to the equipment, the selection criteria may vary, but in any case it is necessary understand the technical characteristics, features and even such seemingly small things as accurate sizes.

Requirements for boiler model

Correctly chosen model - is one that simultaneously provides building the necessary amount of hot water, low-interference in the work process, and fits into the interior design

First, consider the main technical nuances.

Thermal power and performance

The main function of the gas boiler - increase the temperature for hot water and heating, however the power parameters to be considered in the first place. They can be found in the technical data sheet device. To find out if a power boiler for your home / apartment, you should do some simple calculations.

It is considered that for every 10 m² served space heating is required for normal 1 kW. But this average figure, applied to housing with good insulation. Taking into account the climatic characteristics and the need for water heating and for hot water, it is possible to result still increase by 35-40 percent.

power Settings

Power - vacillates, so the technical documentation often possible to meet min and max value, for example 10 kW / 24 kW

The more powerful the equipment, the more productive it is. Performance indicated in the data sheet, makes it clear how many liters of water is heated for 1 minute to the desired temperature.

Are two parameters - temperature 25 ° C and 35 ° C. Some mistakenly take these figures for the water temperature at the exit, but it is not. This difference between the inlet temperature and the already heated water.

Assume that the inlet coolant temperature is 10 ° C, thus at 35 ° C in water gets cranes 45 ° C. At 25 ° C the water is heated more quickly, therefore, the heating rate above.

If at 25 ° C the performance is equal to 13 l / min, then at 35 ° C, it is about 9 l / min. Of course, these values ​​will be more accurate if the water pressure and the gas pressure will conform to the standards that are in testing taking into account manufacturer.

What heat better?

The heat exchanger is intended to transfer heat from the hot gases (combustion) heat carrier, distributed in two systems. Selection is facing the two types of elements: a pair of separate (primary + secondary) and Bithermal.

In devices with separate primary heat exchanger has the form of tubes with plates and stored over the gas burners and the secondary looks like a few broad plates assembled together and having a nozzle 4 for connection 2 instead. Origin is responsible for the heating system, the second - for heating water for domestic hot water.

Scheme of separate heat exchangers

Scheme of separate heat exchangers in the water heating operation for domestic hot water. Above the gas burner (1) and the igniter (2) is the primary heat exchanger (3). The secondary heat exchanger (4) is located below and is connected to a three-way valve (7)

If we use the hot water tap, the work flow sensor (6) and the water under the action of the circulation pump (5) will be supplied to the primary heat exchanger, but for DHW loop.

The second type - bithermal exchanger - characterized in that it serves both circuits: and hot water and heating.

It has a special design of pipes in which water for DHW moves along the inner channel and heat carrier for heating - on the outside. Advantages of Bi-thermal heat exchanger: saves space inside the housing, a simplified design of the boiler, the lower price.

However, when choosing increasingly inclined to purchase devices with separate heat exchangers for the following reasons:

  • elements rarely fail due to the formation of scale and sludge;
  • primary heat exchanger is easier to clean and rinse;
  • the boiler can be repaired by parts;
  • no risk of a burn due to excessive hot water (secondary only heats up to 60 ° C).

If there is a choice between expensive models, we suggest condensing type that are economical and significantly more power.

Driving device condensing boiler

Driving device condensing boiler. The energy produced due to the settling on the walls of tubes of water vapor serves to heat the heat medium. The resultant condensate is given into the sewers

The cost of condensing units starts from 100 thousand. rub. An example is the line of eco the German manufacturer Vaillant.

What are the combustion chamber?

From the combustion chamber design depends chimney device and ventilation, so it must also be taken into account. A choice between two types: open and closed, which differ fundamentally.

Open combustion chamber located above the burner, under the hood, and connected to a vertically oriented chimney. The combustion air is taken directly from the room (kitchen, hallway, boiler room).

Scheme closed and open combustors

For units with open chambers to satisfy more stringent requirements: the need for separate vertical chimney, the organization of adequate air flow and forced ventilation

In the closed type combustion air chamber passes through the coaxial flue passage therethrough same are ejected from the burner gases. Natural draft does not matter, since a centrifugal fan used to remove combustion products.

Preference is given to the device with a closed chamber, although they are more expensive. They do not need to be equipped with a separate chimney, besides, they have higher efficiency. Models with open chamber may be useful to replace the older devices, if the installation site is already equipped with a functioning ventilation and a vertical chimney.

Other important selection parameters

In addition to these structural characteristics, affects the performance and the cost of equipment, there are a number of features that facilitate the management and maintenance of the gas bypass boiler.

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Protect from freezing when the temperature drops

If the gas boiler is installed in the country with a seasonal or occasional residence, the frost protection mode will automatically control the temperature. For example, when lowered to + 6 ° C increase to + 10 ° C

Remote boiler control

modern models controlled via built-in or separate from the thermostat function Wi-Fi. At a great distance from the boiler can not only keep an eye on instrument readings, but also to program device

Multistage system of protection against failures

Gas boilers any modifications are high-risk devices, so the optimal system of protection is a must. It is triggered when a gas leakage, damping burner insufficient traction, low water pressure, etc.

Convenient control panel on the housing

The design and content of the panel may be different, widely used push-button and touch control. The display data is displayed on the pressure in the network, a water temperature, operating modes. The display may be digital, signal, arrow and others.

Protect from freezing when the temperature drops

Protect from freezing when the temperature drops

Remote boiler control

Remote boiler control

Multistage system of protection against failures

Multistage system of protection against failures

Convenient control panel on the housing

Convenient control panel on the housing

When you purchase it is also important to clarify the dimensions of the device and the desired diameter of the chimney to install the boiler in the home, focusing on fire safety standards.

How to correctly choose the double-pressure boiler, taking into account the technical characteristics described article, The content of which is devoted to this complex issue.

Overview of gas boilers manufacturer

In countries where gas heating used actively, the market is filled with products of different companies. The competition is so high that companies can not withstand it because of the poor quality of the goods, quickly go from a distance.

Consider best offers producersThat are popular and are distinguished by excellent quality.

Boilers Italian company BAXI

BAXI company established a little less than a century ago - in 1924. Today it is part of the holding BDR Thermea and specializes in the production of the wall of the gas equipment. Known line ECO boilers, MAIN, NUVOLA, LUNA proven itself as a reliable and well-functioning equipment.

Gas boiler BAXI

BAXI brand device adapted to the conditions of the country, which are exported. All models feature a classic design and a user-friendly control system

Home owners with a deficit of free space for the installation of gas boilers will be interesting ECO Four model series. This ultra-compact device height of 73 cm, and width - 40 cm. Capacity is limited to 24 kW, but it is sufficient to heat the house 200 m².

Among the models - Single and double-circuit, with different types of combustion chambers. Required element - LCD display showing the relevant parameters.

German quality Bosch Thermotechnology

Emerged in the nineteenth century, Bosch is known in many industrial sectors, including in the manufacture of gas boilers residential applications. Double-circuit wall devices that are available in many parts of the world, have a high processability, compactness and ease of control.

BOSCH GAZ 6000 Turbofan boiler

Popular among users of the model - a compact double-pressure boiler with installation on the wall BOSCH GAZ 6000. Boilers adapted for use in Russia and produced in two places - in the city Engels (Russia) and in Turkey

Let us consider in more detail than good boilers series 6000:

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A convenient boiler control unit

On the big, bright light illuminated LCD display shows the main parameters of the boiler operation. Button operation and intuitive programming menu does not cause problems for setting up

Two separate coil: primary and secondary

System with two heat exchangers better adapted to connect to the two circuits - heating and hot water. The primary heat exchanger made of copper - a material with high heat transfer

Gas valves for power control

On leaving the primary heat exchanger is mounted a three-way valve, distributes the flow of water along the contours. To control the TC uses an electric actuator. Water flow sensor signals the need for heating and control the water flow

Modulating turbine simplified construction

Previously, turbine governing the work, depending on the size of the chimney and functioning valves, installed only in expensive models. Modification Bosch - a simpler execution of the turbine, allowing to save gas

A convenient boiler control unit

A convenient boiler control unit

Two separate coil: primary and secondary

Two separate coil: primary and secondary

Gas valves for power control

Gas valves for power control

Modulating turbine simplified construction

Modulating turbine simplified construction

The German manufacturer pays great attention to its compact devices and is working on the release of fuel-efficient models. Gladden new items condensation type, allowing to increase efficiency by the use of condensate.

Korea Gas Equipment Navien

We can say that Navien Korean company is slowly but surely gaining the whole world. Starting production of gas heating devices in 1978, it provides equipment already in more than 30 countries.

Asian manufacturer is known that develops environmentally friendly technologies and care about the environment. Part of the profit from sales goes to the own environmental foundation and insulation housing for the poor.

Korean boiler Navien

Gas wall popular models PRIME series, DELUXE, ATMO. All devices equipped with frost protection devices and controlling operation at low pressure gas or water mains

Bonus for lovers of comfort - handy remote A / Y LCD, with which you can adjust the temperature of the water in the hot water, to install cost-effective fuel consumption mode.

In addition to these manufacturers, you should pay attention to the wall modification Italian brands Hermann, Beretta, Weller, Feroli, and Chaffoteaux (France), and Airfel Demarad (Turkey), Protherm (the Czech Republic), Aton (Ukraine) and NEVA Lux Gazlyuks (Russia).

Rules of installation and connection of wall-mounted gas boilers are given in next article, With the content of which we recommend reviewing.

Conclusions and useful videos on the topic

About design features, as well as the nuances of the installation and use of a gas bypass equipment with a wall bracket can be obtained from submitted video.

Video # 1. User Review NAVIEN 24 models:

Video # 2. On the technical characteristics Protherm Lynx 24:

Video # 3. Comparative characteristics of the 1- and 2-contour boilers:

When choosing a gas fired boiler is necessary to be guided not by appearance, which in many models is identical, and the technical capabilities of models. It is important to consider both the home area, and the pressure in the gas line and cold-water network.

Even the new model in need of care, so it is useful to clarify the existence of the workshop and capable to carry out servicing.

Tell us about how to buy a wall unit for the gas installation in your house / apartment. Share than was unreasoned your choice. Please write comments in the block located below, ask questions, post pictures of the article.

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