Radiation heating system: schemes and advantages of wiring. Device and installation of a radiant heating system Radiant heating system

Radiant heating system for a private house

The market offers an endless array of heating technologies for those who decide to heat their homes. But the main elements of all systems are the boiler, pipes and heaters that produce space heating.

There are many options for piping connections. Some people prefer a radial (fan) heating system.

Features of beam wiring

All heating systems are produced with one purpose - to heat the room, that is, to restore the heat that is lacking in the house due to the temperature difference inside and outside (on the street).

There are only two options for combining all heating devices:

1. Trinity connection.
2. Beam wiring of the heating system (collector connection). In this case, a separate pair of pipes is connected to each device with the help of a collector for direct and reverse supply of the heat carrier.

The first version of the pipeline system is budgetary. However, due to the special connection of pipes and connection to one riser, if it is necessary to install a battery or a separate section, the system will have to be turned off entirely and the liquid drained.

Of course, you can also buy stop valves, but the installation will cost much more.

As a rule, the classical distribution of the pipeline around the perimeter is open. Fan heating systems are mainly located in the walls or in the floor, because many pipes lying on the structure do not look very attractive in the interior.

Concealed installation looks good in any room. After all, only heating batteries remain in sight.

The collector-beam heating system is not cheap compared to the perimeter device of the system. However, the advantage of this installation is that the warm liquid will spread to all points at once and evenly heat the rooms.

Collector heating system at home

Pros and cons of a collector heating system

You need to get acquainted with all the advantages and disadvantages of this heating system in advance.

Disadvantages of fan-shaped piping:

1. There is only one strong argument against - the beam system has many elements in its design. including pipes. In addition, it uses a lot of connecting elements.
2. A large number of parts in this system can result in high repair costs. A classic heating system costs less and is cheaper to repair.

It is required to take a very responsible approach to connecting all heating devices of the fan circuit, because errors can cause frequent breakdowns of the system as a whole.

Against the background of the advantages of a radiant heating system, the disadvantages lose their weight. Indeed, in the shortest possible time, a well-mounted system will definitely pay for its installation. In addition, it has many useful features.

Advantages:

1. The fan system allows you to establish heating separately in each room. Thus, the heat in the premises will be distributed more efficiently, and energy carriers will be saved.
2. When installing a radiant heating system, you have access to pipe connections, you can identify and fix problems in time.
3. The pipes of a classic heating system are quite difficult to hide. With fan-shaped wiring, the pipes are hidden in the walls or in the field. If the installation is of high quality and correct, then the elements will not be visible to the eye.

A correctly designed scheme of a radiant heating system makes it possible to rationally distribute heat over all areas of the house.

How to make fan wiring

The collector is the most important element of the system under consideration. When it is planned to organize a fan heating system in a two-story house, the collector must be installed on all floors. Collectors are hidden in a special closet. In the future, they will be easy to maintain or adjust if necessary.

The number of connections is reduced to a minimum, which has a good effect on the hydraulic stability of the entire heating system.

The boiler is the heart of the whole system. To efficiency always strived for the maximum indicator, it is required to take into account the power of the boiler equipment, the consumption of heat energy by heating devices and the heat losses of the system. This applies to all boilers, no matter what type of fuel they operate on.

Some of the heat can be lost with a large length of the pipeline system, which must also be remembered.

Circulation pump selection

Beam piping is usually used in horizontal type systems with a bottom supply of heat carrier. It requires a pump that stimulates the circulation of warm liquid through all branches.

Circulation pump equalizes the temperature readings at the inlet and outlet of the heating circuit. Thus, the quality of heating is improved. The system becomes more compact and less material intensive.

The pump is selected based on performance, as well as head height.

For the correct choice of the circulation device in connection with these characteristics, it is necessary to know the diameter of the pipes, their length and distance from the pump itself. It is necessary to calculate these indicators already at the stage of drafting the project.

How to install the pump

To achieve maximum efficiency and quality heating, the following must be taken into account:

1. Glandless pumps are mounted with the shaft horizontal.
2. The equipment is usually installed on the return line of the pipeline system, since the temperatures are lower there. Newer devices can also be installed on the supply circuit, they are not afraid of high temperatures.
3. Should be as close as possible to the expansion tank.
4. The thermostatic pump must be kept away from hot objects.
5. The heating circuit must be equipped with a de-airing device. In the absence of it, the circulation pump is bought with air vent.
6. To remove solids before installation, experts advise flushing the system.
7. Before starting the pump, it is worth filling the system with coolant.

In order to avoid noise, it is worth selecting circulating equipment based on the performance of the heating system.

Many are interested in the question of whether it is possible to do without a pump, sensors and air vents. The answer is yes. However, it will be necessary to organize some conditions, because the circulation of the coolant will be natural.

A small cottage or other small facility may be optimally suited for a system with natural fluid circulation. However, no matter which version of the heating system is chosen, everything should be thought out at the stage of drafting the project.

Distribution header selection

It is also called a comb. It is necessary for supplying liquid to a warm floor, radiators, convectors, etc. With the help of it, an outflow is carried out along the return circuit, from where the liquid is then sent to the boiler or mixed again in the circuit for temperature adjustment. The collector copes with a maximum of twelve branches.

As a rule, combs have redundant locking-regulating and temperature-regulating elements. With the help of them, it is possible to adjust the rational flow of the heat carrier for all heating circuits. The presence of air blowers can guarantee the quality and stability of the system.

Mounting Features

Laying pipes of a hidden type implies the mandatory organization of thermal insulation. Heating elements can be heated up to +90 ° C, which can have a bad effect on both the screed and the wooden elements. You just need a heat-insulating material that restrains the speed heat transfer so that the heat has time to be distributed by the system. The market offers special polyethylene casings for concealed laying of pipelines.

To mount, you will need certain skills. The quality of the prepared pipe (its end with a calibrator) is very important for a tight connection with a fitting. Usually they use reliable compression fittings, connections of branches with fittings on heating batteries and collectors are not made collapsible.

Preparing for installation

Before you start all installation work, you should correctly select all the required elements and consider the location of the devices, including the following:

1. Decide on the place of installation of heating batteries.
2. Choose the type of radiators in connection with the pressure indicators and the type of heat carrier. Calculate the required number of sections or the area of ​​panel heaters so that there is enough heat to heat all rooms.
3. Draw a diagram of heating radiators and laying pipes. Do not forget about other heating elements (boiler, pump and collectors).
4. Write down all the necessary elements on paper, and stock up. In order to be sure of the calculations, you can consult with a specialist.

Installation of a radiant heating system

Initially, radiators are installed in each room. Their location on the same level is checked with a level. The power of the devices is calculated based on heat loss. On heating batteries they put plugs, thermostatic head connection points, taps (transition fittings for metal-plastic are connected to them).

Collector box installed. As a rule, simple and cheap distributors are selected, equipped with ball valves with 16 mm outlets and ¾ connections. American women are mounted on the collector.

You can connect the collector device to the boiler (to the tees of the line from the boiler) hidden under the floor or along the walls. Then the collector is connected with a supply and return of 16 mm to all heating devices.

Radiation system and underfloor heating

Fan wiring has the same principle as a water heated floor. Theoretically, a warm floor can be connected with batteries through one comb. This option is suitable in cases where you want to make warm floors in certain rooms, and install batteries in others.

When planning fan distribution with underfloor heating, remember that the system will work, however, floor heating is a low temperature system and radiators require high temperatures.

When nothing can be done to adjust the temperature, then there are two options: either with warm floors in the room you will be stuffy, or with batteries it will be cold. Remember this.

I must say about another plus of the collector heating system - a comfortable warm floor. This is because when fan-shaped wiring is installed, the distributors are placed near the risers or the center of the room. For all that, the pipes from the distributor to the batteries most often pass along the corridors, entering the premises through the door openings.

Pipelines are insulated with a material in one layer. However, most craftsmen know that 6-9 mm thermal insulation transmits up to 30% of heat.

Therefore, in places where the radiant heating system passes, the floors are not cool, but warm. The benefit is twofold: a reliable heating system without joints and optimally warm underfloor heating.

In a wooden house

To lay the pipeline in a wooden base, you need to make holes in the wooden floor beams. With all the holes, you need to make a little more than the diameter of the pipes in order to exclude the pressure of the beam on the structure.

It is required to securely fix the pipes in wooden floors, but not to create pressure.

Connections should be above the floor covering, they should not be in the thickness of the floor.

Frequently asked Questions

• Q: What pipe diameter is best?
  Answer: as practice shows, the 16th pipe diameter is enough to install the fan system. Rarely use a larger size.
• Question: Is it possible to have a radiant heating system for a private house with two floors?
  Answer: of course. Wiring can be arranged in a three- and four-story house. It is only important to put a separate collector on each floor.
• Question: is fan wiring possible in the apartment?
  Answer: it's real. Most likely, this cannot be done directly from the combined heat and power plant. But if you have your own heating system, or if you connect to the combined heat and power plant through a heat exchanger, then everything will work.

If we consider the radiant heating system at home in more detail, we can highlight even more of its advantages than mentioned above. Analyzing them, you can close your eyes to the shortcomings. Of course, an efficient system with high performance simply cannot be cheap, but its long service life and easy maintenance are trustworthy.

The variety of schemes for heating buildings that exists today makes it easy to choose the best option for heat supply. However, not all of them can be sufficiently effective in the case of providing heat to houses with a complex configuration or multi-room layout. And in difficult projects, the modern radiant heating system has proven itself well, while not very popular, but gradually gaining recognition from both specialists and property owners.

Unlike others, such a scheme provides for individual heating of each of the installed heating devices, i.e. both supply and removal of the coolant are carried out in parallel through pipes separately connected to the radiator. Externally, the configuration of this system resembles rays diverging in different directions from a heat source, which gave it its name.

Radiant heating can be organized with one or two pipes. The second option finds the greatest application, which is distinguished by higher heat transfer rates, and, consequently, greater efficiency.

Figure 1 - General scheme of a radiant heating system

Structure of a radiant heating system

Any heating system has in its structure a heat source (boiler, stove, boiler), heating devices (radiators, convectors), pipes, shut-off and control valves, and in most cases a circulation pump. The beam scheme also implies the use of the above elements, as well as important equipment that distinguishes it from others - the collector.

Many of the listed structural components are standard, so it is inappropriate to dwell on their description. Below we will consider only those for which special requirements are imposed.

Heat sources

As you know, this is the main unit of any home heating system, the choice of which should be approached reasonably. The beam scheme is structurally quite complex and, accordingly, requires powerful equipment.

When choosing the power of the boiler, it must be taken into account that an extensive network of pipelines laid in radiant heating, as a rule, in the floor structure, causes somewhat large heat losses that affect the efficiency of the system as a whole.

Heating manifold

The second most important element in such a heat supply system is collector. It is a device in the form of a short pipe with numerous nozzles for connecting radiators. In the literature, you can often find another name for it - comb.

Figure 2 - Heating manifold

The dimensions of the collector can be adjusted during operation, adding new sections as new heaters are connected.

Its main function is to centrally distribute the coolant from the heat source to the heating devices. It also allows you to adjust the heating intensity of each of them, as well as turn off a separate circuit for repair or scheduled replacement without affecting the operation of the system due to the installation of various types of shut-off and thermostatic valves.

Radiant heating, as a two-pipe system, involves the use of two collectors: supply and discharge, which are usually installed in pairs. And to accommodate the entire assembly, it is recommended to use a special cabinet, which will not only provide free access to the equipment, but also hide its unaesthetic appearance.

It should be noted that the use of collectors in the heating circuit makes it easily modernizable and allows it to be connected to the Smart Home system. Specially installed sensors provide the ability to automatically control the degree of heating of the coolant depending on temperature fluctuations in the premises, as well as remote control of home heating.

Circulation pump

A radiant heating system, as a rule, implies forced circulation of the coolant, therefore it necessarily requires the installation of a pump.

When choosing a model of a circulation pump, one should take into account not only its power, but also such a parameter as the speed of pumping water per unit time.

Depending on the complexity of the configuration of the circuit, as well as the length of the pipelines, two devices may be required, mounted both on the supply and on the return.

Pipes

Metal, metal-plastic and polypropylene pipes can be used to organize a radial heat supply scheme. When choosing a particular type, one should proceed not only from the cost of products, but also from the complexity of installation and repair. In this regard, the plastic version has found the greatest use.

When purchasing pipes, it must be taken into account that their diameter must correspond to the dimensions of the inlets and outlets of the boiler and collector. If necessary, the use of adapters is allowed.

The main advantages and disadvantages of a radiant heating system

The organization of the radiant heating scheme predetermined a number of its benefits, among which should be noted:

• reliable operation - the system eliminates the possibility of hydraulic shocks; there are few weak points in it, since the number of pipeline connections from the collector to the radiator is minimized, or they are completely absent;
• independence from the configuration and size of the building (flexibility) - it allows for efficient heating of a house of any layout and number of storeys;
• balance - all heaters heat up evenly;
• the possibility of regulation, including automated, temperature in each of the premises;
• ease of repair and maintenance work - the replacement of damaged areas does not require opening the floor covering; to carry out such events, the required circuit (beam) is turned off without affecting the functionality of the system;
• the possibility of modifying the system at any stage of creation and operation;
• aesthetic appearance - pipelines are usually laid in the floor structure, and collectors are installed in special cabinets or niches.

Despite its high efficiency, the radiant heating scheme has several shortcomings:

• high material consumption and, accordingly, price - due to the significant total length of pipelines, as well as the need to purchase a large number of connecting elements, control valves, manifolds, pumps, sensors, etc.;
• the need for competent and high-quality installation in order to avoid problems in the future.

Existing schemes and nuances of mounting the beam system

The classic version of such heat supply provides for the installation of heating collectors on each of the floors or parts (with a complex configuration) of the building.

In this case, the collectors are mounted on the walls (in existing or previously provided niches) or placed in special cabinets, and the piping system is laid along the subfloor, as a rule, before the screed is made.

Figure 3 - Scheme of installation of a radiant heating system

If the collector is located above the radiators, air will accumulate in it over time. To eliminate this, the mandatory installation of automatic air vents is required.

There is also an option in which the heaters are placed at a higher level, i.e. the comb is mounted on the basement or basement. In this case, the pipelines are laid along the walls, which are subsequently sheathed with structures of various types (plasterboard sheets, PVC panels, etc.) to give them an aesthetic appearance.

Figure 4 - Radiant heating with the lower location of the collector

In two-story, small-sized houses, one can sometimes find a scheme using one collector unit, which provides heating for both levels. In this case, it is required to purchase a sufficiently powerful pump capable of pumping the coolant to all floors. But since the cost of the corresponding equipment is quite high, this option is practically not used.

Figure 5 - Scheme of radiant heating of a two-story house with one collector node

Arrangement of the heating system is the most expensive item in the estimate of major repairs or construction. From the correct installation and the features of all elements of this object, the operational characteristics, the costs of the owners for energy resources in the winter period depend.

Gradually replaces the obsolete tee wiring. This is due to a number of its advantages. How to equip such a wiring on your own, as well as what are its main features, the master must find out before starting installation.

general characteristics

Can be done with various wiring. The beam system is also called the collector system. Each radiator in the building is connected to K by a separate pipe. Each of them returns its own pipe to the collector. Radiators with this connection are a separate element. They are independent of other heating devices in the network and are connected to the collector in parallel.

The collector is a general device. He is responsible for supplying the coolant to each individual circuit. If it is necessary to repair one battery, the heating system continues to operate as before. Only one radiator is cut off.

according to the tee scheme, it involves a smaller number of pipes. However, installation costs pay off during the operation of the system. The positive economic effect from the use of beam wiring in a large house or cottage with two or more floors is especially pronounced.

Advantages and disadvantages

Some features are characterized beam wiring of the heating system. Advantages and disadvantages such an organization must be considered before installation. The disadvantages include a larger number of pipes and fittings. This greatly increases the cost of repairs. The tee scheme is much cheaper during installation. Also, a large number of connections, if connected incorrectly, can lead to frequent system breakdowns.

However, all these shortcomings fade against the background of the advantages of the radiation organization of heating. In this case, the system quickly pays for its installation cost. The ability to regulate the heating in each room significantly reduces energy costs. When organizing such a system, many joints and surges are obtained. The master has easy access to them. Therefore, when carrying out repairs, this factor greatly facilitates the work.

The pipes of the beam system can be hidden under the floor, in the thickness of the wall or simply behind the curtains. A properly planned scheme allows you to remove unattractive communications from view. The tee scheme does not provide such an opportunity to homeowners.

System elements

Consists of several required elements. The main one is the boiler. When calculating its power, the area of ​​\u200b\u200bthe premises, as well as the heat loss of the building, are taken into account.

The circuit includes a circulation pump. There are systems with natural circulation of the coolant. However, they are less efficient. Today, almost all radiant heating schemes incorporate a pump. It forces the heated liquid to move along the contours at a certain speed. In this way, it is possible to maintain the optimal mode of heating the room.

The collector is a distribution unit. He is responsible for the optimal nutrition of all circuits. This element may incorporate various control and shut-off equipment. The presented devices are installed in a special cabinet. This allows you to protect the equipment and hide it from prying eyes.

Circulation type

Can use the principle of natural or forced circulation. In the first case, the coolant is distributed through pipes and radiators by gravity. This requires the installation of pipes of large diameter. This is a simple but less efficient system. It is suitable only for a small one-story house, to which electricity is not supplied.

In modern construction, beam systems are used in combination with a pump. It provides forced circulation of the coolant. The pump is installed on the supply or return circuit. It works with a certain power. Such a device is necessary for the heating system of a large or two-story cottage.

Due to the mass of advantages, as well as the acceptable cost of circulation pumps, today this installation option is used almost everywhere.

Design

Calculation of a radiant heating system carried out at the design stage. To do this, on paper, you need to draw a detailed diagram with dimensions. It lists all elements. If necessary, the drawing can be ordered from a special organization.

First you need to evaluate the existing features of the premises. The rooms should not be decorated. It is best to hide the pipes in the floor under the screed. The plan also indicates the radiators, their location (on the wall under the window). The number of sections and their internal volume depend on the material of the convector, as well as the thickness of its walls. In accordance with the parameters specified by the manufacturer, the need for the volume of coolant for each battery is calculated.

According to the ray scheme, it is characterized by some additional heat losses. The heated liquid is supplied to the batteries through pipes, the length of which will be greater than in the tee scheme. This feature must be taken into account in the calculations.

The plan shows where the pipes will be laid. Manometers, thermometers, shut-off and shut-off valves are added to the equipment. Before installation, all elements of the main and additional equipment should be carefully considered. The sequence of their installation is also indicated in the diagram.

Manifold selection

Includes a collector (comb). This element has branch pipes for the inlet and outlet of the coolant. For a beam scheme, two types of collectors should be installed.

The first of these will be the input comb. A pump is connected to it, as well as a coolant distribution valve. It can be three- or two-way. The valve contains a thermometer. It is installed in the collector housing. The device transmits information to the valve. It opens or closes the damper, mixing hot liquid into the circuit.

The outlet collector collects the cooled coolant, which is returned to the boiler. The heater heats it up again. Additionally, a balancing flow controller can be installed on this branch pipe. The collector group ensures the stability of the system. It is responsible for optimizing and balancing the heating of the coolant in the system.

Pipe selection

Which is mounted according to the beam scheme, requires the correct selection of pipes. Communications must be flexible enough to avoid the installation of a large number of connections. Pipes made of cross-linked polyethylene are best suited for these purposes. Such products are sold in bays.

Polyethylene pipes that are suitable for a radiant heating system must have an airtight layer. When using conventional varieties, air enters the system. It leads to the development of corrosion of metal elements, the rapid failure of equipment.

¾ inch pipes are used to connect the collector to the boiler. Radiators can be connected to the comb with ½ inch communications. This is possible under the condition of application in the pump. Otherwise, the diameter of the pipes may be larger.

Mounting Features

It can be mounted by the owners of a private house. To do this, it is necessary to allocate a separate room for the arrangement of the boiler room.

After installing the heater, a comb is mounted immediately after it. The equipment must be in a protective box. The collector must be freely accessible. A manometer and a thermometer are installed at the outlet of the coolant. Mayevsky crane and other safety devices allow to stabilize the pressure in the system.

Shut-off valves allow, if necessary, to carry out preventive maintenance or repair of equipment. After installation, the equipment is checked. If everything is normal, the pipes are poured into the screed.

When deciding how to heat their own home, the owner can choose from a variety of heating technologies. What they have in common is a similar set of structural elements, which includes a boiler, a pipe system and heaters that directly heat the room.

There are differences in the schemes for connecting pipelines, one of its options is a radiant heating system, the characteristics and construction rules of which will be discussed in the article. We have described in detail the specifics of the collector wiring, provided options for its arrangement. The criteria for selecting equipment for the construction of contours were outlined.

For visual perception of the information presented, the text is supplemented with collections of photos, useful diagrams, and videos.

The main task of the heating system is to compensate for the heat that the building loses due to differences between the internal and external air temperatures, as well as due to the different degree of thermal conductivity of the external walls. Its solution largely depends on a well-chosen one that delivers the coolant to the devices.

In practice, you can connect all heating devices together by the following methods:

• tee connection;
• radiation(manifold) connection, when a separate pair of pipes is supplied to each heater using a collector for direct and reverse supply of coolant.

A tee or perimeter type of pipe connection is cheaper. But due to the fact that the devices are connected to each other and connected by a pipeline to a single riser, the system will need to be completely turned off and freed from the coolant to repair a separate radiator or section. Or equip with bypasses and valves, which will significantly increase the cost of organizing heating.

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There are a considerable number of wiring for radiator heating pipes, but due to many of its advantages, two wiring has become especially entrenched: two-pipe and beam. Most often, any developer has to choose between these two systems (if it was decided to install radiators by itself). In the hope of getting recommendations from installers, you usually do not meet objectivity and everyone woo what is more convenient for him.

And there is also the most pleasant phrase that every customer likes to hear: “well, you decide there yourself, but it doesn’t matter to us what to mount.” Let's try to adequately understand the strengths and weaknesses of the two-pipe and beam radiator wiring

This is a consequence of the evolution of a single-pipe system, in which all the main shortcomings were eliminated. In this system, two pipes are connected to the radiator in parallel. One supply, then supply, the other reverse, then return. A hot coolant is supplied to the supply, and it will enter each battery with almost the same temperature. And on the opposite side, the already cooled coolant flows by itself.

In a single-pipe system, we were faced with the fact that only one looped pipe was responsible for the supply and return. Therefore, the temperature difference between the first and subsequent batteries was more significant. And it was not possible to "level" the system so that each radiator was at the same temperature.

What is a radiant heating scheme?

Let's now highlight the strengths and weaknesses of each heating scheme

Which heating is cheaper?

The most eye-catching plus of a two-pipe system is the price. This system is cheaper than beam. Mainly due to the fact that fewer pipes are used and there is no need to buy a distribution manifold. But in a two-pipe system, more fittings are used. At our last facility with an area of ​​300 squares, the difference between the beam and two-pipe system was 30,000. In both cases, metal-plastic pipes were used, as well as connections from the same company.

On the one hand, this can be written down as a disadvantage of the ray system. But on the other hand, for such an object, for many developers, the difference of 30,000 will be insignificant.

Materials used

Polypropylene can be used for piping a two-pipe system. As we know, this is the most affordable type of pipe on the market. Now we will not list the advantages and disadvantages of this material. Just need to keep in mind that if the budget is limited, then you can use polypropylene

For beam wiring, only metal-plastic pipes or pipes made of cross-linked polyethylene with a thicker wall are used.

Number of joints

Here its clear advantage is behind the radiant heating system. Its main advantage is the absence of connecting parts in the concrete screed. All connections are in the manifold and on the radiator itself. Accordingly, if something ever decides to leak, then it will happen in a visible field and you can quickly eliminate everything.

In a two-pipe system, all connections are poured with a concrete screed and recessed into the walls. This adds to the likelihood of any leakage due to the operation of the system. Although press and tension pipe connections are famous for their reliability, accidents are actually quite rare.

Another thing is if you use polypropylene. There are even more joints and most of them are also located in an inaccessible area. This is where the lottery really comes in. If suddenly, the installer welded the joint inaccurately, then it may not leak immediately. Will last a year or two. And that's where the fun begins. So with flush-mounted polypropylene pipes, I would recommend being extremely careful.

Temperature control

These systems have convenient ways to adjust the temperature. The most commonly used thermal heads on radiators. This is a relatively inexpensive and convenient adjustment option.

The advantage of the beam system is that you can put servo drives on the collector and control the temperature in each room using room thermostats. This option is already much more expensive, but at the same time more advanced.

What is the bottom line?

An insignificant minus of the beam system can be attributed to the fact that space is required to install the collector. And in fact, it is not always present. Plus, it is desirable to put the collector in the middle of the house.

If we consider these two systems in terms of efficiency, economy, then they have absolute parity. Both systems do their job remarkably well.

Just if your budget is limited, then you should look towards the two-pipe system. You can also use polypropylene if you wish. The beam system will add to you some conveniences and peace of mind, that under the screed, in which case, nothing will leak.

It is important to understand the main thing. In both cases, your choice will be absolutely correct!