What are single-circuit gas boilers + their operating principle and the most popular manufacturers

Many homes depend on single-circuit gas boilers as a dependable source of heating, making them an indispensable fixture. These boilers are an easy-to-use and effective way to keep your home warm because they only heat the water that runs through radiators and underfloor heating systems. Single-circuit boilers do not supply hot water for taps like their double-circuit counterparts do, which can be advantageous if you have separate systems for your hot water and heating requirements.

Gas boilers with a single circuit have a fairly straightforward working principle. Heat is produced by burning gas in the combustion chamber of the boiler. The water that circulates through the system then absorbs this heat. Warmth is released into your living areas via the pumping of heated water through radiators or underfloor heating pipes. A continuous cycle that maintains the temperature in your house is created when the water cools and then returns to the boiler to be heated again.

Regarding the selection of a single-circuit gas boiler, a number of manufacturers are distinguished by their dependability and efficiency. Boilers with long-term durability and efficient heating are produced by renowned companies such as Bosch, Vaillant, and Baxi. These manufacturers are well-liked by both homeowners and heating professionals because of their reputations for cutting-edge technology, sturdy construction, and first-rate customer service.

Making an informed choice can be aided by knowing the fundamentals of single-circuit gas boilers and the leading manufacturers, whether you’re installing a new heating system or upgrading your old one. You can make sure your house stays warm and cozy during the winter months by choosing the correct boiler.

Feature	Description
Definition	Single-circuit gas boilers are heating devices that provide hot water for space heating only.
Operating Principle	These boilers burn gas to heat water that circulates through radiators or underfloor heating systems.
Energy Efficiency	Modern models are designed to maximize energy efficiency, often featuring condensing technology.
Installation	Installation requires a gas supply, a flue for exhaust gases, and a connection to the heating system.
Popular Manufacturers	Vaillant, Viessmann, Worcester Bosch, and Baxi are some of the well-known manufacturers of single-circuit gas boilers.

What is a single-circuit gas boiler and what is the difference from a double-circuit one??

Gas boilers with a single circuit are made to do one simple job: heating the coolant. They don’t address any other issues and only have one main heat exchanger.

By doing this, you can increase the unit’s resistance to all loads and influences, increase its reliability, and minimize the number of parts and components in its design. These designs differ from double-circuit ones in that the hot water supply is not prepared independently.

But if you connect single-circuit boilers to an external storage boiler, they can supply a house with hot water just fine.

When an external storage tank is used, the amount of domestic hot water it can hold is significantly more than when a double-circuit boiler is used. Furthermore, there are no sudden temperature fluctuations when turning on the faucet.

Advantages and disadvantages

Boilers with a single circuit have the following benefits:

• simplicity, reliability of design;
• absence of unnecessary components and parts;
• less risk of breakdown, more stable operation of the device;
• the absence of additional components reduces the weight of the boiler;
• when using an external boiler, it becomes possible to supply hot water, and this method is considered more effective;
• the price of single-circuit models is lower.

Consequences to take into account are:

• there is no possibility of preparing hot water independently;
• the cost of external boilers is quite high, and installation requires space;
• in the summer, you have to spend fuel to heat water in an external boiler (if there is one);
• the use of external storage devices increases the load on the heat exchanger and increases fuel consumption.

The drawbacks of boilers with a single circuit are not very problematic. Experts choose to buy precisely these kinds of units in order to use a boiler to get a more dependable heating system and a steady supply of hot water.

Operating principle

The idea behind single-circuit installations is the use of a gas burner to heat the coolant through flow. The heat exchanger, which receives the return flow from the heating circuit, is where the process happens.

The liquid exits the heat exchanger and enters the three-way valve after reaching its maximum temperature. To achieve the temperature that the mode specifies, it combines hotter return flow with colder return flow.

Through the use of a circulation pump, the prepared coolant is transferred from the boiler to the heating circuit for the subsequent circulation cycle. The turbocharging fan is in charge of providing air and eliminating smoke, while the circulation pump moves the liquid.

A self-diagnosis system consisting of sensors and thermistors that is linked to the electronic control board keeps an eye on the unit’s performance.

Every issue that occurs is shown on the screen as a specific error with a special designation.

Kinds

Certain features are shared by a number of designs.

By way of installation:

• wall-mounted. Mounted in a hinged manner on load-bearing walls. They are made from lighter parts and assemblies, so their power is limited;
• floor. More powerful and heavier boilers, capable of heating larger rooms.

According to the kind of combustion chamber:

• atmospheric (open). Works on the principle of a gas stove. The air comes directly from the premises, and the smoke goes into a traditional stove-type chimney under the influence of natural draft;
• turbocharged. The air supply is carried out by a special turbocharging fan. There is excess pressure inside, displacing smoke through a special horizontal chimney.

As per the material of the heat exchanger:

• steel. The most common type of construction for budget models. Usually they have a tubular design, less often they are created in the form of a water jacket;
• copper. Installed in the form of a coil in more expensive models;
• cast iron. They are used only for floor-standing models, as they are large in weight and size. Demonstrates high performance and stability.

Through the process of heat transfer:

• convection. Heating of the coolant depends on the operating mode of the gas burner;
• condensation. A two-stage method of preparing the liquid is used – first it is partially heated in the condensation chamber, after which it is finally brought to the desired temperature in the usual way. For primary heating, the thermal energy released during condensation of exhaust smoke is used.

Condensation models can only operate when the temperature differential between the interior and exterior is less than 20°. This essentially rules out the use of such structures under Russian conditions.

Do I need a boiler??

A container with a coolant coil inside is called an indirect heating boiler. It is attached to boiler pipes made specifically for these kinds of equipment.

The water in the tank heats up as the hot coolant travels along the coil. The volume is refilled during disassembly and is continuously heated by the coolant circulating.

When the user wishes to supply hot water, a boiler installation is required.

No other equipment is required if the boiler is only used for heating.

Most popular manufacturers

The industry leaders in single-circuit boiler manufacturing are European firms.

Among them are:

• Viessmann. A German company known for the high quality and durability of its products;
• Vaillant. Also a German company, well known to Russian users. Produces several series of boilers adapted to difficult Russian operating conditions;
• Baxi. One of the leaders of Italian heating engineering;
• Ariston. Another representative of the Italian industry. Famous for quality and affordable prices;
• Bosch. A transnational German concern that produces a huge number of technical devices, including single-circuit gas boilers;
• Protherm. Slovak company offering a wide selection of high-quality gas boilers;
• Navien. This is a company from South Korea. Famous for its high quality and affordable prices for all boiler models.

The aforementioned list is not exhaustive. Only the most renowned manufacturers on the Russian market are these ones.

Installation and Installation

The method of installation varies depending on the type of boiler; for wall-mounted models, special brackets that come with the delivery kit must be fastened in advance. Floor-mounted units are set up on specific stands or, if they satisfy fire safety regulations, directly on the surface.

For atmospheric models, it is imperative to make sure the boiler is positioned correctly in relation to the central chimney or to first drill a hole in the wall and install a horizontal pipeline. Establish a communications connection after installation.

The principal ones are:

• gas supply;
• forward and return lines of the heating circuit.

Furthermore, the majority of single-circuit boilers come with pipes that can be used to connect an external boiler. Plugs are fitted if it is absent.

An alternative method of connecting the boiler is by creating a break in the supply line. The direct boiler pipeline is connected to the boiler’s inlet, and the heating circuit is connected to the boiler’s outlet.

When seeking for an economical way to heat their homes, homeowners frequently opt for single-circuit gas boilers. These boilers are a simple and dependable choice because their only purpose is to heat water. They work by heating water through the use of natural gas, which is subsequently pumped through radiators or underfloor heating systems. Several models are available from well-known manufacturers like Bosch, Vaillant, and Ariston; these units are renowned for their dependability, energy economy, and feature-rich designs. This post will discuss the advantages of single-circuit gas boilers as well as the best brands to take into account for your home’s heating requirements.

Rating of TOP 5 wall-mounted single-circuit boilers

Let’s look at the most widely used wall-mounted single-circuit boiler models:

MORA-TOP Meteor Plus PK24SK

Engineers from the Czech Republic designed and produced this gas convection boiler.

The unit has a 24 kW power output, or 240 kW per square meter of serviced area. The boiler has an electronic control system and multiple stages of protection against external factors or malfunctions while it is in operation.

Primary settings:

• Efficiency – 90%;
• coolant temperature (max) – 80°;
• pressure to the heating circuit – 3 Bar;
• gas consumption – 2.6 m3/hour;
• dimensions – 400x750x380 mm;
• weight – 27.5 kg.

The most popular models are those with this power because they roughly match the requirements of medium-sized private homes.

BAXI ECO Four 1.14F

Gas boiler with convection, Italian. With its 14 kW of power, the unit is appropriate for rooms up to 140 square meters.

These could be tiny homes, offices, or apartments. Because of its closed combustion chamber, the unit can be placed in the kitchen.

Let’s examine its attributes:

• Efficiency – 92.5%;
• coolant temperature (max) – 85°;
• pressure to the heating circuit – 3 Bar;
• gas consumption – 1.7 m3/hour;
• dimensions – 400x730x299 mm;
• weight – 31 kg.

Although the quality of Italian heating equipment is well known, the costs cannot be deemed extremely low.

Viessmann Vitopend 100-W A1HB001

German technology is now considered to be of the highest caliber by all manufacturers. This view is supported by the Vitopend 100-W A1HB001 boiler.

Its 24 kW power is the most widely used amount for heating a 240 kW house. m. Installation in the kitchen or other interior rooms of the house is feasible because the turbocharged burner doesn’t release any smoke odors.

Choices:

• Efficiency – 91%;
• coolant temperature (max) – 80°;
• pressure to the heating circuit – 3 Bar;
• gas consumption – 2.77 m3/hour;
• dimensions – 400x725x340 mm;
• weight – 31 kg.

It is possible to switch the unit to using liquefied gas as power; however, this will require changing the nozzle set and a few other settings.

Buderus Logamax U072-24

Superior heating boiler produced by a well-known German manufacturer.

The fact that the business is a division of the Bosh concern speaks volumes about the caliber and competence of the division. Heater area: 240 square meters; power: 24 kW.

Principal attributes:

• Efficiency – 92%;
• coolant temperature (max) – 82°;
• pressure to the heating circuit – 3 Bar;
• gas consumption – 2.8 m3/hour;
• dimensions – 400x700x299 mm;
• weight – 31 kg.

A heat exchanger in the form of a copper coil powers the device. This improves heat transfer and strengthens and stabilizes the boiler.

Protherm Panther 25 KTO

This model has been modified twice, in 2010 and 2015.

They don’t really differ from one another. Some shortcomings have been removed and power has been slightly increased in a more recent design. Its 25 kW makes it possible to heat 250 square meter homes.

Boiler specifications:

• Efficiency – 92.8%;
• coolant temperature (max) – 85°;
• pressure to the heating circuit – 3 Bar;
• gas consumption – 2.8 m3/hour;
• dimensions – 440x800x338 mm;
• weight – 41 kg.

Slovakian equipment is a well-deserved success with consumers.

One distinguishing element of the series are their names. For instance, every wall-mounted boiler series has an animal from the cat family as its name.

Rating of TOP-5 floor-standing single-circuit boilers

Now let’s look at the most widely used floor-standing single-circuit boiler models:

Protherm Wolf 16 KSO

Slovak-made gas convection boiler. Because of its energy independence, it can be used in isolated communities or places where power outages are common.

It has a steel heat exchanger and an open-type burner. The unit has 16 kW of power, which is enough to heat a 160 kW/m³ home. Concerning

Steel properties

• Efficiency – 92.5%;
• coolant temperature (max) – 80°;
• pressure to the heating circuit – 1 bar;
• gas consumption – 1.9 m3/hour;
• dimensions – 390x745x460 mm;
• weight – 41 kg.

Because of the boiler’s 2-pass heat exchanger, you can raise the volume of liquid that is heated.

By doing this, you can improve the natural circulation that energy-independent installations require to function.

Lemax Premium-20

Russian manufacturers are not the same as Western manufacturers. There, having as many options as possible is crucial, but maintaining process continuity and dependability is also required for operations in Russia.

For this reason, the boilers that our manufacturers make are primarily energy-independent. With this model’s 20 kW of power, you can heat an area that is 200 square meters.

Unit specifications:

• Efficiency – 90%;
• coolant temperature (max) – 90°;
• pressure to the heating circuit – 3 Bar;
• gas consumption – 2.4 m3/hour;
• dimensions – 556x961x470 mm;
• weight – 78 kg.

Buying a boiler also comes with the benefit of a long 3-year warranty.

Lemax Premium-12.5

The heating floor boiler, produced in Taganrog, has a power output of 12.5 kW. With this, you can heat an area of 125 kW/m^. This device has an atmospheric combustion chamber and is non-volatile.

Principal attributes:

• Efficiency – 90%;
• coolant temperature (max) – 90°;
• pressure to the heating circuit – 3 Bar;
• gas consumption – 1.5 m3/hour;
• dimensions – 416x744x491 mm;
• weight – 55 kg.

The mechanical operation of all controls and protection devices removes the chance of burnout or shutdown.

Lemax Premium-25N

An additional 25 kW-power output from the Taganrog plant. This allows for the serving of a 250 square meter room.

Its specifications:

• Efficiency – 90%;
• coolant temperature (max) – 90°;
• pressure to the heating circuit – 3 Bar;
• gas consumption – 3 m3/hour;
• dimensions – 470x961x556 mm;
• weight – 83 kg.

Only the power output and unit size distinguish the various Lemax boilers from one another in terms of features.

MORA-TOP SA 60

Gas boiler, standing, Czech, 49.9 kW in power. This can be used to heat an area up to 500 square meters.

• Efficiency – 92%;
• coolant temperature (max) – 85°;
• pressure to the heating circuit – 3 Bar;
• gas consumption – 5.8 m3/hour;
• dimensions – 700x845x525 mm
• weight – 208 kg.

A large cast iron heat exchanger that offers uniform heat transfer and high efficiency is fitted with this boiler.

Any model can be used with external drives as long as the necessary pipes are installed or a break-in connection is made.

Price range

A single-circuit boiler can cost anywhere between 12 and 80 thousand rubles, depending on its power. Installations for industrial use are substantially more expensive than this range, which applies to domestic models.

For many homeowners, single-circuit gas boilers are a sensible option. By concentrating only on warming the area and not adding extra features to the system, they offer effective heating. This is a big plus for people who like things simple because it makes them easy to use and maintain.

These boilers have a fairly simple operating principle. They produce heat by burning gas, and that heat is then transferred to the water that runs through the heating system in your house. This procedure guarantees a steady and dependable supply of heat for the entire property. In many areas, single-circuit gas boilers are a preferred option due to their dependability and efficiency.

In the industry, a number of producers have established a solid reputation for creating superior single-circuit gas boilers. Strong and effective designs are characteristic of well-known brands like Vaillant, Worcester Bosch, and Viessmann. These businesses make significant investments in R&D to guarantee that their boilers are at the cutting edge of technology, offering consumers dependable performance and energy economy.

Selecting a single-circuit gas boiler from a reliable supplier guarantees that you will get the newest models and a strong guarantee. These boilers provide a dependable way to maintain a warm and cozy home, whether you’re replacing your old heating system or installing a new one.

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