Strapping of a single-circuit boiler with indirect heating boiler

To keep your home comfortable and cut down on energy expenses, make sure your insulation and heating system are operating efficiently. The correct installation and strapping of an indirect heating boiler with a single-circuit boiler is a crucial step in this process. This system is essential to efficiently distributing heat throughout your house, guaranteeing cozy temperatures even in the coldest months.

The single-circuit boiler with an indirect heating boiler has various benefits when it comes to heating systems. Indirect heating boilers use a separate heat exchanger to transfer heat from the boiler to the water, in contrast to traditional boilers that heat water directly for home use. This indirect approach prolongs the system’s life and increases energy efficiency while lowering the chance of corrosion and scale buildup.

Careful planning and execution are necessary to strap a single-circuit boiler to an indirect heating boiler properly. The first step in the process is choosing the ideal location for the boiler, taking into account elements like ventilation, ease of maintenance, and distance from gas and water lines. Furthermore, minimizing heat loss and increasing overall efficiency can be achieved by making sure the boiler and pipes have enough insulation surrounding them.

Its adaptability is one of the main advantages of coupling an indirect heating boiler to a single-circuit boiler. Homeowners can tailor their heating configuration to suit their needs and tastes by integrating this system with a variety of heat sources, such as biomass boilers, heat pumps, and solar panels. Modern thermostats and controls also make it possible to precisely regulate temperature, which maximizes comfort and reduces energy use.

Homeowners can have dependable and effective heating all year long by investing in the correct installation and strapping of a single-circuit boiler with an indirect heating boiler. This system not only keeps the entire house consistently warm, but it also contributes to lower energy costs and utility bills. You can extend the life and performance of your heating system and ensure comfort and savings for many years to come with expert installation and routine maintenance.

What is a single-circuit boiler

The single-circuit boiler is the more common of the two types of boilers currently in use. It is distinguished by the number of integrated heating circuits it has. The single-circuit boiler’s only useful feature is the ability to supply heat to the batteries, raising the room temperature. Since the mixer’s design cannot provide hot water to the faucet, it serves no purpose in this situation. The different heating methods, power, and flow rate of the boilers account for their electric (FET, induction, electrode) and gas nature.

The terms "central tank," "heating elements," "tubular heating elements," "inlet-outlet connections in the lower part of the body," "circulation pump for running water in the system," "thermostat," and "indicators" are used to describe electric boilers. The hot water outlet pipe is mounted on the upper cover of the structure, and coils powered by electromagnetic induction replace heating elements in induction boilers. Electrode boilers function by producing heat and an electric voltage through the anode and cathode, which are the poles of a closed electrical circuit that are installed in parallel.

A heat exchanger, the combustion chamber of the fuel entering the boiler from the gas burner, a circulation pump, an expansion tank, a three-code valve, and a valve for connecting to the gas line are all features of this gas single-circuit boiler.

Apart from the inlet-outlet spigot, all contemporary single-circuit boiler models have spigots for connecting to external water heating units as part of their parts. Thus, it is possible to combine an indirect heating boiler with a single-circuit boiler to create a multipurpose heating system and hot water supply for the home.

What is an indirect heating boiler

Its peculiarity is that the principle of operation is based not on heating water at the expense of its own unit, but on heat exchange from external sources, such as fuel combustion, electrical resistance (resistance), contact with central heating, the use of solar panels for energy processing. In its essence, the boiler is a link between the heart of the heating system (boiler) and all its vessels and arteries, correctly distributing the load and pressure on each branch. In this distributor, the hot liquid passes through a metal spiral (coil) built into the storage tank. Heat exchange takes place by means of heat conduction between the coil and the cold water tank. An obligatory part of the boiler is thermal insulation, resembling in structure a thermos to maintain the temperature inside the tank, excluding the loss of accumulated joules outside the device. The material for thermal protection is mainly polyurethane. The boiler circuit also includes a protective anode, inspection hole, baffle, immersion sleeve (for temperature sensor).

Water can be heated quickly thanks to the heat exchanger—up to 20 minutes to go from freezing to sixty degrees Celsius. The sole requirement is that in order to heat a space so quickly, an indirect heating boiler must be connected to another boiler—most frequently a gas boiler.

Boiler and indirect water heater circuitry

It is crucial to remember that there are specific guidelines that must be followed before direct piping can be connected to the two heat supply system components that are being considered (the indirect boiler and the single-circuit boiler).

1. The location of the boiler should be chosen based on the location of the boiler itself. It is best to place them as close to each other as possible. This will reduce the time of hot water entering the tap;
2. Purchase and install a membrane hydroaccumulator at the outlet of the hot liquid from the boiler, which helps to prevent damage due to the effect of thermal expansion;
3. Additionally install a ball valve on each circuit;
4. Fasten the check valves to regulate the direction of water flow;
5. Place filters for cleaning;
6. The pump shaft should lie horizontally.

There are various ways to execute the piping:

Variant 1. Connection by means of a three-way valve.

We have covered the three-way valve previously. This unit, which enters the boiler, branches off of it, and exits into the heating sector, is positioned at the head of the scheme. To increase productivity and efficiency, this unit is built as a parallel connection between the boiler and the system. One of its advantages is the ability to change the heat priority from radiators to the indirect heating boiler’s rapid heating. Requirement for customers who use the boiler regularly.

See a variation of this plumbing plan in our video.

Option 2. Two circulation pumps

This scheme doesn’t have a three-way valve. Standard tees are used to transfer water to various areas of the system. Two pumps are installed: one on the heating circuit and the other on the BKN supply pipe. This solution’s goal is to always have warm water available for the household.

Variant 3. Use of a hydraulic arrow

Incredibly labor-intensive installation procedure that involves setting up the equipment on multiple separate circuits. It is distinguished by multilevel living, as in a two- and multi-story home. Appropriate for customers who use a lot of warm surfaces, allowing multiple taps to be opened simultaneously with hot water.

Variant 4. Recirculation of the coolant

The same battery that heats the bathroom also powers the zigzag towel drier. The circuit’s water masses are continuously circulated in order to maintain a steady temperature. High energy consumption is a drawback.

Option 5. BCH circulation without energy consumption.

The force of attraction serves as the foundation for the working principle. Using this approach, the tank is mounted above the water-bearing system as a whole. The boiler simply drains the water to every part of the circuit after receiving it from the boiler pump.

Boiler with water heater. Summer operation

Summertime brings with it the increase in outside temperatures and the directive to turn off the heating system. Which mode does the indirect water heater use to heat water that has already been heated externally during the summer, on its own? Some boiler owners "flash" their heating element devices in order to avoid using the boiler during the summer. Nevertheless, a tubular electric heater’s working capacity will not be enough to efficiently provide hot water for a large volume of water. It takes a while for the heating point to appear.

Installing a gas boiler is the best method to escape the agony of a hot water shortage. It allows you to concentrate the heated water in the faucet along with the integrated three-way valve that switches from heating to DHW. The gas burner valve opens in an ascending order. Gas raises the coolant’s temperature gradually. When the predetermined temperature rises above 5 degrees, the built-in relay (circuit breaker) opens the electrical contacts; it closes when the temperature drops by 1 degree.

Many single-circuit gas boilers have a summer mode of operation that heats the indirect heating boiler without using energy on the heating system.

Examples of boilers working directly with water heaters

Buderus U-072/Bosch Gaz A6000

A three-way valve with a servo drive integrated into the boiler model allows it to be used with an indirect heating tank. All you have to do is purchase a temperature sensor from Bosch and install it between the boiler and the tank.

The connection is easy. According to the diagram, locate the boiler sensor terminals inside the boiler and attach the wire ends to them. The boiler’s special connector requires the second end to be inserted. The installation is finished at this point.

Baxi Luna 3

This option is also available (single-circuit model only) from a well-known Italian brand. The boiler must have a servo drive with a remote sensor installed. After connecting them, you have a functional diagram.

Protherm Skat/Vaillant EloBlock

This option is also available for the German company’s electric boilers. Purchasing a specific module called "Fugas," installing it on the boiler, and connecting the sensor to the boiler are required.

Installing an indirect heating boiler in place of a single-circuit boiler is a critical step in creating a warmer, more energy-efficient home. In order for the two systems to function as a unit, maximize heat distribution, and reduce energy waste, they must be connected. Homeowners can enjoy constant warmth throughout their living spaces and lessen their impact on the environment and utility bills by integrating these technologies. This combination guarantees optimal performance with proper installation and upkeep, making it a wise investment for anyone wishing to improve the insulation and heating capacity of their house.

Two in one. Gas boiler with boiler

In order to save space in the internal layout, as well as simplified connection, you can resort to innovations in plumbing. Ready-made solutions have been developed that allow the boiler and boiler to be used in one seamless package. Such models are a floor unit, where under the boiler directly located under the tank itself, containing water. The volume of water can be 40, 60, 80 liters and more. Mounted single-circuit boiler with a boiler with the help of fixing plates, without the need for additional screwing. In addition, thermostats, monometers, LCD panels allow you to monitor and adjust the water supply yourself, track the temperature and change it with a rotary mechanism from anywhere in your property, or from a remote digital panel. A striking example of such a model is the Baxi Luna 3 Comfort Combi boiler.

Indirect boiler or two-circuit boiler

Installing just a two-circuit boiler or combining an indirect boiler with a single-circuit boiler is frequently the option. Although a two-circuit boiler will be far less expensive, it can only produce 12 to 18 liters of hot water per minute.

In addition, the amount of water that can be supplied in a given amount of time is greater with an indirect water heater. It is therefore preferable to use a boiler bundle with a tank if there are multiple hot water consumption points. All you can do if there’s only one bathroom is install a two-circuit boiler.

The efficacy and efficiency of your heating system can be greatly increased by wrapping your single-circuit boiler with an indirect heating boiler. This way will help you distribute heat as evenly as possible throughout your house, keeping it warm all winter long.

The capacity to supply hot water on demand without interfering with the heating process is one of the main advantages of equipping a single-circuit boiler with an indirect heating boiler. This implies that you can maintain a comfortable temperature in your living areas while having a consistent supply of hot water for various household needs.

In addition, the indirect heating method reduces heat loss, which ultimately results in higher energy efficiency and lower costs. Utilizing the boiler’s heat for hot water as well as heating will help you use less energy overall and pay less in utility bills.

In addition, the installation of an indirect heating boiler allows for increased system design flexibility and versatility. This configuration can be adjusted to fit your unique requirements and space limitations, regardless of whether you’re planning a new construction project or retrofitting an existing heating system.

To sum up, installing an indirect heating boiler on a single-circuit boiler is a useful and effective way to improve the efficiency of your home’s heating system. This method has many benefits for homeowners who want to lower their energy bills and increase their comfort level, including constant warmth, hot water on demand, energy efficiency, and design flexibility.

Video on the topic

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