What is better a two-circuit boiler or a column

Can it be installed next to the boiler

Rules, which regulate the location and connection of the hot water unit, are prescribed in SP 62.13330 Gas Distribution Systems. The code clearly states that the necessary distance between the boiler, the column should be determined directly by the manufacturer. There is no limit in the documentation itself, which specifies the minimum or maximum value.

If you look at the information in the instruction manual, the following information is displayed as standard:

It is forbidden to install a gas boiler on top of each other, placing the equipment side by side is allowed.

Requirements for the room for installation of a gas boiler and a boiler are prescribed in SNiP. It states:

The minimum area must be 8-9 m; height of ceilings. from 220 cm; the room requires a window or a window that can be opened; it is forbidden to place gas equipment in bathrooms and living rooms; the room, which is used as a boiler room, must be closed by the door, the gap between the floor and the floor. from 5 cm; mandatory conditions. Triple air exchange and natural fresh air extraction.

Comfort of use

It is more convenient to use an electric boiler than a gas boiler. First of all, because it is possible to set the smallest water pressure, because its functionality does not depend on the flow of water.

In addition, if you connect an additional water point, the temperature of heating will not drop as in the column. Both devices need to be descaled and inspected annually. The heat-exchange apparatus of the column is required to be cleaned from soot, the electric boiler is cleaned from scale and the magnesium anode is replaced. Obviously, it is difficult to give preference to one or another device. Everything will depend on the wishes of the subscriber. For those who need maximum comfort, it is preferable to buy an electric heated water heater.

For those who are more important cost-effectiveness or have restrictions on the placement of the unit. it is preferable to choose the economical gas-fired boiler.

Two-circuit gas boiler

This type of equipment can separately heat the coolant in the heating system and water separately. Wall-mounted and floor models of different capacities are available. This option is considered ideal when it is necessary to arrange gas heating of a country house.

  • The device is a system “2 in 1”;
  • Relatively affordable cost (you buy one device instead of two);
  • Easy installation;
  • A wide range (there are models with autonomous and mechanical control).

Features that two-circuit gas boilers have:

  • The boiler operates continuously, even in the summer period for heating water. This often causes the formation of condensation inside the heating system, which increases the risk of corrosion. To solve the problem will help periodic preventive maintenance of the heating circuit and softening of water through different filters.
  • For comfortable use of hot water consumption points should be installed as close to the boiler. Otherwise, you can not avoid large heat loss.
  • Many boilers do not operate simultaneously for heating and DHW. As a result, during the consumption of hot water heating circuit is not heated, which leads to increased fuel consumption due to the additional heating of the coolant.
  • The most important. if the boiler breaks down, consumers are left without hot water and without heating.

Gas boiler column

Boiler columns running on gas are used in cottages, country houses, apartments and small offices. They provide an uninterrupted supply of heat and, depending on the configuration, heating of water in the central water supply system.

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Cross sectional diagrams help avoid misinterpretations. Cross-sectional charts help to avoid misinterpretations. No problems due to the high exhaust temperatures of fireplaces. With the increased implementation of oil combustion systems, stone damage is increasing. Lower temperatures Increased damage Lower exhaust temperatures, lower exhaust gas flows and resulting condensation and acid attack have led to moisture and debris intrusion. Dual-sink and triple-shell duals helped with the hassle.

Design features, principal differences

Single-circuit boiler is used for heating the premises with the heating medium by means of 1 heat exchanger built into the boiler. Gas boilers, which design supposes two heat exchangers, t.е. separately heating and water coolant for heating and DHW. are called double-circuit.

Photo from ktl.by

  • On the location. on floor and wall;
  • On energy efficiency: the usual, using low heat of combustion and condensing, designed to consume more heat of combustion of fuel with the additional use of thermal energy released with the condensate from water evaporation;
  • by the constructional arrangement of the gas burner. with an open and closed combustion chamber.

We also recommend reading: floor or wall gas boiler, which is better and Top 10 best floor gas boilers

When operating a gas boiler, you need to remember that gas is not only a boon, but also source of increased danger. Therefore, independent installation of equipment can lead to gas leaks and irreparable consequences.

To put into operation must obtain a package of permits and consult with a specialist. Even better. trust the installation of heating professionals. You should not save on the health of loved ones.

The difference lies in the design and purpose:

  • Gas water heater has one working loop, which provides the room with hot water. The cost of a boiler is usually inexpensive, and it is easier to install it. Sanitary and hygienic standards are less stringent, since we are talking about supplying only hot water to the building.
  • Gas boiler has two working circuits. The first heats the water, feeds it to the hot water system. The second heats the water, feeds it into the heating system. It costs more, and it is a little more difficult to install it. SanPiN norms will be more stringent.

Simply put, the water heater provides only hot water. while the boiler is both water and coolant for the heating system. Devices have some other differences, but they are minor, so in our review, we will omit them.

The figures in the payment receipts are not happy every year. Counting the costs, almost every second person asks the question how to solve two global problems more economically and efficiently for each family DHW and heating in the cold season. What to choose a boiler that provides simultaneous DHW and heating or a unit with a single circuit combined with a third-party water heater?

Two-circuit boiler is equipment that is designed to heat hot water for consumer use and space heating. Today, modern gas boilers have become quite technological equipment, their efficiency can exceed 110. Because of the constant rise in gas prices, modern manufacturers carry out a lot of upgrades for greater savings, in order to keep their consumers. Modularized gas burner output, all possible room and outdoor temperature sensors, and more.

better, two-circuit, boiler, column

There are 2 main types of two-circuit boilers:

Combi Boiler with Two Heating Zones, 230V Switching

• with integrated heat exchanger for hot water and heating• With a built-in tank for DHW.

By virtue of its compactness and functionality solves two problems at once, boilers two-circuit are very popular in new buildings in Ukraine. They are ideal for 2-3 room apartments with 2-3 water outlets. It is important to note that the gas dual boiler needs time to cook the first portions of hot water for household needs.

Wall mounted gas boiler with a built-in boiler is an alternative to two-circuit gas boilers. On the one hand, there is a constant supply of hot water. Reduces the waiting time and water consumption. On the other hand, the manufacturer still aims to keep the unit compact, so there is no physical possibility to provide a large volume of boiler. Typically, it is from 40 80 liters.

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WaterStore recommends dual-sink gas boilers from proven manufacturers:

Design and peculiarities of operation of boilers

Modern gas boilers, depending on the number of circuits, can be single-circuit and double-circuit. They are externally and structurally similar, but designed for different tasks, and in different conditions.

As a result, it can be argued that both types of equipment are equally useful and effective, so there is no better among them. So it all depends on the right choice. Next, let’s understand in detail what is still different between the single-circuit type of gas boiler and its two-circuit counterpart.

Differences in the design of single and double circuit units

Products that belong to both varieties of equipment in most cases consist of the same components.

Detailed arrangement of the modern single-circuit wall boiler and the scheme of its two-circuit “brother” are shown in the following pictures:

The basic units of the two types of boilers are similar in both name and purpose.

So, similar elements of single-circuit and two-circuit equipment:

Even the design element intended for heating water they have the same name. a heat exchanger.

But if you look into it, it turns out: the name is the only thing similar to this node in boilers of different types. a single-circuit unit heat exchanger is a tube, which serves for efficient transfer of heat, released during combustion of gas, to water.

And in the case of its two-circuit counterpart, everything is not so simple, since its heat exchanger is structurally more complex. And such products are divided into separate subtypes and can be bitermic and twin.

In the first case, the design is a pipe, placed in a similar product of larger diameter. This feature allows you to create 2 circuits, one of which is designed to transfer the heat of the fluid used for heating, and the second for the hot water system.

  • pipes that provide heating water for heating;
  • plates that transfer the heat to the water-supply fluid.
better, two-circuit, boiler, column

That is, the design complexity of two-circuit boilers heat exchangers differ solely because of the need to solve two problems.

But still the most significant difference between single and double circuit products is the presence in the design of the latter three-way valve. whose task is to change the direction of hot water.

So in the standard position, the valve is in a position where the heat transfer fluid only to the radiators. Everything changes when you open the hot water tap. Since the three-way valve, upon receiving the appropriate signal, moves to a different position. Namely in providing hot water supply.

In this case, the supply of coolant to the radiators is stopped, and in full. the premises will not be heated for the duration of the use of hot water for household purposes.

That is the design of double circuit boiler allows it to supply hot water only in one of two modes. Still, this feature should not be considered a weakness of the equipment.

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Comparative review of gas boilers

Both presented types of equipment serve to heat the coolant in order to heat the premises, buildings. The functionality of single-circuit boilers is limited to this.

Their two-circuit analogues are additionally used to provide hot water in order to solve any domestic problems. That is, give the opportunity to take a shower, perform any other hygienic procedures, wash the dishes, etc.

Next, we will conduct a comparative review of single-circuit and two-circuit boilers on a number of criteria.

Comparison criteria Single-circuit boiler Double-circuit boiler
Type of installation floor; wall mounted floor-standing; wall-mounted
Additional capital investments Are absent, if there is no need for DHW; if DHW is required, you will need to purchase a storage boiler no more than 2 extraction points and they are located next to the boiler
Cost efficiency turns on when the water temperature in the boiler cools below the permissible level the heating circuit is turned on when the coolant is below the permissible level; the DHW circuit is turned on every time after water extraction
Compactness When used in conjunction with a boiler, the occupied area actually doubles is more compact than a single-circuit; wall-mounted models are suitable for use in a limited space
Ease of use when used in conjunction with a boiler hot water is the same temperature at all extraction points, the coolant in the heating system is supplied evenly when the capacity of the boiler is insufficient and there are many water intake points, the water and coolant temperature may vary dramatically; with open water taps, the water is not supplied to the heating system
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As we see, to organize the hot water supply in the presence of a one-circuit boiler will have to buy additional equipment. For example, a boiler of indirect heating. And this is an additional cost.

over, after buying a boiler it must be properly installed and connected. And how to do it correctly and what to consider when operating such devices, we described in detail in this article.

What is better a boiler or a water heater?

When there are two-circuit models of boilers, it seems: Who uses columns at all? After all, the boiler is able to perform two functions at once: to heat the room and provide DHW, unlike a gas boiler, which only heats water for household needs.

But there are nuances in which you have to put a separate boiler for heating and water heater for DHW.

The principle of operation of a two-circuit boiler

Such models of boilers have two heat exchangers. One is aimed at heating the coolant for the heating system, the second heats water for DHW.

What is a Boiler and How does It Work?

The advantage of such boilers is their compactness and low price compared to the purchase of two devices (boiler and water heater). When installing a two-circuit boiler requires only one connection to the gas line, which reduces the cost of drawing up documents from the gas supply company.

The disadvantage is the fact that most models of dual-circuit boilers shut off the heating circuit when you open the tap DHW. As long as the hot water flows, the room is not heated.

Two-circuit boiler is ideal for rooms, in which the use of DHW by a small number of users is provided. Then during the heating period, the temperature in the room will not drop significantly low, and deliver discomfort.

The principle of operation of the boiler and gas water heater for DHW

Household gas-fired flow-through water heaters, known to all as gas water heaters, are used to heat water in residential areas.

Equip the room with a boiler, and the column may be a more convenient solution. In this case, each direction will work independently, independent of each other. In case of breakdown of the boiler, the DHW will still work and vice versa.

When you turn on the hot water, the boiler will continue to heat the radiators without loss of heat in the room. This is especially true for buildings with a large number of users.

  • in total, the cost of two units will cost 30-50% more than the price of a two-circuit boiler;
  • Boiler and column requires more space for installation, so it may not suit everyone;
  • require the appropriate specifications for the allocated cubic volume of gas consumption;
  • According to the building regulations, two separate smoke exhaust systems are required.

In the selection of heating and DHW at the initial stage must take into account all the nuances and consult with experts.

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