Plastic pipes for heating: sizes, which is better and the rules of choice

The longevity and efficiency of your home heating system depend on the pipes you choose. Plastic pipes are becoming more and more popular among the options available because of their resilience, adaptability, and simplicity of installation. This post will compare popular options, examine various sizes of plastic pipes used for heating, and go over important things to think about when selecting the best plastic pipes for your heating system.

Because plastic pipes can tolerate high temperatures and are resistant to corrosion, they are frequently used in heating systems. In addition, compared to metal pipes, they are lighter, which makes them simpler to handle and install. The two most popular plastic pipe types used in heating systems are CPVC (chlorinated polyvinyl chloride) and PEX (cross-linked polyethylene).

PEX pipes are available in diameters ranging from 3/8 inch to 1 inch. For residential heating systems, 1/2 inch and 3/4 inch are the most popular sizes. Because PEX pipes are flexible, they are perfect for installations where you need to bend and move around obstacles. Additionally, they can expand and contract in response to temperature changes, which lowers the possibility of frozen pipes bursting.

CPVC pipes, on the other hand, range in diameter from 1/2 inch to 2 inches and are stiff. Despite not being as flexible as PEX pipes, CPVC pipes can be used in both hot and cold water distribution systems and are still quite simple to install. Additionally corrosion-resistant, CPVC pipes are a robust choice for heating systems.

There are a few important things to take into account when deciding between PEX and CPVC pipes for your heating system. These consist of your heating system’s particular requirements, regional building codes and regulations, financial considerations, and individual preferences. You can make sure that the plastic pipes you select for your heating system will function dependably for many years to come by considering these factors.

Sizes Which is better and the rules of choice
Plastic pipes for heating come in various sizes, including diameters of 16mm, 20mm, 25mm, and 32mm. When choosing the best plastic pipes for heating, consider factors like the material (such as PEX, PPR, or PVC), the intended application, and the specific requirements of your heating system. Additionally, make sure to follow the manufacturer"s recommendations and local building codes when selecting the size and type of plastic pipes for your heating system.

The difference between the tap and heating system

Knowing exactly which kind of plastic pipe will work best for a given project is important because different plastic pipe types have different operating characteristics.

  • For cold water supply networks, any kind of polymer pipes can be used.
  • In hot water supply networks, the carrier has a temperature of 50–75 ° C, so for the construction of networks only materials resistant to high temperatures. PVC pipes are not recommended here, since the material begins to melt already at 50-60 ° C.
  • In heating systems, the carrier temperature can rise to more serious values. Pipes made of stitched polyethylene, polypropylene or metalloplasty are suitable here.

Regarding the working environment pressure, this indicator can range from approximately 4 bar in water networks to 2–12 bar in central heating networks (based on the number of stories), and 1.5-2 bar in private heating systems. The selection of pipe material may also be influenced by this indicator. Use of reinforced products or thick-walled pipes is preferable for high-pressure networks.


Apart from the PN marking, which denotes pressure and temperature, there are: all plastic pipes

  • The word "pipe";
  • the name of the material in abbreviated form;
  • SDR – the value of the external size to the thickness of the walls;
  • external profile size;
  • Operational class;
  • the outer pressure of the working pressure;
  • Standart room.

SDR 11–20´ Pip PP–R 1.9 Class 1/1.0 MPa Whereas: GOST R 52134-2003

  • Polypropylene profile with random – copolymer SDR 11;
  • external diameter 20 mm;
  • wall thickness 1.9;
  • class 1;
  • Permissible pressure 1 MPa.

Profiles in structure are separated into:

  • S – single -layer;
  • M – multi -layer;
  • Ti – with a heat -insulating layer;
  • PP – standard;
  • PP-RP-withstanding high pressure.

Based on the kind of content, there are:

  • PPB – they have high strength, their purpose – sexual heating with hot coolant;
  • PH – have an enlarged internal diameter, mounted on ventilation systems and cold water;
  • PPR is a universal type, withstanding elevated temperatures.

They are split up in the class into:

  • Class 1 – up to +60 C, intended for water supply;
  • 2 – up to +70 (pipelines);
  • 3 – + 60 (warm floors);
  • 4 – +70 C, used in heating;
  • 5 – + 90 (heating);
  • Class XB – for cold water supply.

Each manufacturer marks their products with a trademark.

Temperature table

We provided a table of the temperatures that polypropylene pipes can tolerate for clarity’s sake.

View Purpose Maximum temperature level Working pressure (atm)
Pn 10 Cold water supply +40 p 10.2
PN 16 Universal model +60 16.3
Pn 20 Universal +80 – 95 20.4
PN 25 Hot water +95 – 120 25.5

Features of use in the heating system

Temperature of polypropylene pipe degradation. Check Out This YouTube Video

Polypropylene profiles are being utilized more frequently these days to heat private buildings as well as central heating systems. Because they are resistant to deformation, oxygen leakage, and freezing temperatures, the system as a whole is not harmed when water in the highway freezes.

You can respond to the question of which polypropylene pipe is best to buy for heating with clarity: you need to get one that can withstand temperatures as high as +60 to +95 C. The best PN 20 models are those with a heating degree of +60 or PN 25 – +95.

It is important to consider the following factors when selecting heating polypropylene profiles, in addition to temperature:

  1. Plastic products are strict, it is difficult to bend them. To turn the highway, it is required to install a corner, which is not very convenient.
  2. The cross section of the pipes should correspond to the size of the risers to which they will be connected. In a private house, central wiring is made from a profile with a cross section of 32 mm, connection to batteries is made by pipes with a size of 20 – 25 mm.
  3. Pip PP fittings have a large section, which worsens the appearance of the system.
  4. Polypropylene is stretched when heated, this leads to the refinement of the walls and sagging the pipeline, which looks ugly with open installation.

When mounting the plastic pipeline, it’s crucial to avoid overheating it because this could cause the passage to narrow when the pipe is inserted into the fitting. The system’s efficacy is greatly diminished by this error.

Additionally, strapping boilers with polypropylene products is not advised. The boiler room experiences frequent temperature changes, which is inappropriate for this kind of profile.

Considering everything mentioned above, polypropylene species that have a maximum temperature of +95 are excellent choices for the heating arrangement.

Using fiberglass as reinforcement

Fiberglass or aluminum foil are used as reinforcement for any polypropylene pipe. However, many manufacturers refused to use aluminum foil, opting instead to use fiberglass because aluminum foil greatly increases the product’s value. The fiberglass itself cannot withstand falls or extremely low temperatures. However, polypropylene pipes are frequently just kept in cold storage in retail and wholesale establishments. Verifying the method of material transportation from the manufacturer to a specific retailer is also challenging. As a result, there’s a chance you’ll receive a subpar product, and a reinforced layer won’t allow you to double-check everything.

Technical characteristics of PVC plastic pipes for heating

Products made exclusively of chlorinated polyvinyl chloride are used for the installation of systems using hot coolant. There are two types of HPVX pipes made:

  1. Green Line Type One. This material withstands heating up to 80 ⁰C, and at 95 ⁰C it begins to deform. It is possible to use in heating and hot water supply systems in which the temperature does not exceed the maximum value.
  2. Flow Guard Gold Type Two. Material with great capabilities, since the operating temperature is 100 ⁰C. Products from it are used to lay not only internal, but also outdoor communications.

Other qualities indicate that the varieties are comparable:

  • thermal conductivity – 0.14 W/MK;
  • temperature expansion coefficient – 0.62;
  • Density – 1.57 g/cmᶾ;
  • Strest of fluidity-50-55 MPa;
  • strength – 10 MPa;
  • oxygen permeability at 70 ⁰C – less than 1;
  • elasticity module – 2400.

Chlorinated polyvinyl chloride’s low thermal conductivity makes it possible to lay highways inside structures without worrying about condensation or thermal insulation. High rigidity, however, places additional limitations on how they can be used. Manufacturers of solid products guarantee that the operational properties won’t change for 25 years.

Owing to its superior qualities, PVC pipes for heating offer the following benefits:

  • long service life;
  • high environmental safety, since toxic substances are not released during heating;
  • mechanical strength, which allows without grave consequences to withstand blows from randomly dropped objects;
  • lack of need for staining, as polyvinyl chloride does not burn out;
  • relatively low cost;
  • a smooth inner surface, due to which plaque and deposits are not formed;
  • simple installation;
  • lack of need for special care;
  • Small weight – 9 times less than that of metal analogues;
  • antibacterial properties that are provided by the presence of chlorine;
  • vibration resistance.
  • The lower temperature limit of -10 ⁰C is insufficient in the conditions of the Russian climate, so enhanced thermal insulation is required for the outer laying;
  • Due to high rigidity for installation, a lot of fittings are necessary;
  • The reliability of the system is guaranteed provided that the pressure in it does not exceed 6 atm at the maximum permissible temperature.

Polypropylene elements

There are various varieties of polypropylene pipes.

Structures with only one layer. PPRC’s random-polymer, the blockopolymer polypropylene RRV, and the homopolymer RRN are a few examples.

Multiple polypropylene layers. Three types are produced by products made from such material, each with unique characteristics:

  • The thick -walled pipe of the PP is covered with aluminum foil with a sealant and protected by a thin layer of polypropylene.
  • Products in which all layers are connected by perforated holes in the foil.
  • Plastic of less flexibility is concluded between the two main layers.

The products’ outer diameters range from 1.5 to 12.5 cm, and the pipe’s standard length is 4 meters. The equipment for polypropylene pipes varies according to their intended use; extras like a decorative box and fittings for pipe connections can be added to the kit.

Using specialized equipment, thermoplastic welding is used to join fittings and polypropylene pipes. By using threaded connecting elements, pP pipes can be connected to a steel pipeline.

Scope of use

Polypropylene pipes find application in various domains:

  • Household cold water supply, including drinking water.
  • Heating and hot water supply systems (using pprc pipes).
  • Technological pipelines, including lines for transporting products and installing compressed air.

Advantages and disadvantages

  1. Plastic pipes are not destroyed with prolonged moisture exposure.
  2. The material is environmentally friendly. He does not emit harmful substances when heated.
  3. Due to the low thermal conductivity, the water reaches heat exchangers without cooling.
  4. Average service life under normal operating conditions without overloads – 50 years.
  5. Due to the high noise insulation of the material in the rooms, the sound of water flowing through the tubes is not heard.
  6. Plastic parts are easy to transport, collect together without the help of outsiders.
  7. Plastic is not deformed when exposed to chemicals that may be contained in pipeline water.
  8. The plastic tubes have smooth internal walls. Thanks to this, plaque does not accumulate on them.
  1. High linear expansion coefficient. It must be taken into account when connecting individual elements of the pipeline.
  2. Low heat resistance. Therefore, when installing the pipeline on the street, you need to use additional insulation.
  3. The material is aging faster under the influence of ultraviolet rays.

More fasteners are required if the pipes are installed on vertical surfaces in order to prevent the pipeline’s individual components from sagging.

The ease of installation for pipes

Technical characteristics of PE pipes

Hot water circulating systems can also use polyethylene pipes.

They possess the following qualities at work:

  • the ability to function in conditions of the bearer to 90 ℃;
  • maximum working pressure can reach 10 bar;
  • maximum pressure at temperature indicators of 0-25 ℃ can reach up to 25 bar;
  • Short -term temperature peak can be 100 ℃, but no more;
  • When using pipes from the material with the above characteristics, their service life may also reach 50 years.

PE pipe for heating systems

PEX is the brand of polyethylene pipes used for heating and hot water supply. This particular polyethylene is made with a unique technology that suggests the formation of longitudinal and transverse molecular bonds during the manufacturing process, giving it enhanced strength and thermal resistance. These polymers are still referred to as stitched.

The principles of choice

A few things to consider when selecting plastic tubes are as follows:

  • pipes diameter;
  • the pressure that will occur in the pipeline;
  • temperature regime of operation;
  • Wall thickness.

Metalloplasty pipes (MP)

Pipes composed of a combination of plastic and aluminum foil are another type of plastic heating pipe. A five-layer "pie" is formed by the adhesion of these materials with special glue: plastic, foil, glue, and plastic.

A metal-plastic pipe reserved.

Among the aforementioned types, MP pipe is the most resilient because it can tolerate pressures up to 25 bar and temperatures up to +25 °C. Similar to re-pipes, MP pipes are adaptable and ideal for intricate circuitry. produced in 500 m-long bays.

MP pipes can be connected in three different ways: connective, compression, or non-proceeding. While the first type only requires a wrench and is easy to install, the last two types require special equipment, making it less likely that they can be installed on their own.


The cost of the plastic pipes is significantly lower when compared to copper or stainless steel pipes, which are also renowned for their durability.

Good water flow rate is provided by the smooth inner surface of the pipes, which also prevents deposits and scale growth.

Because the lumen doesn’t change in diameter over time, the pipeline’s throughput and efficiency stay constant.

The ease of installation of plastic is an additional benefit. Due to their light weight, the pipes can be independently unloaded and transported in a family vehicle. Even for non-professional construction businesses, mastering the use of compounds, fittings, or soldering irons is an easy task.

Cost, resistance to corrosion, fifty years of service life, simplicity of installation, and plastic pipes manufactured with everyday items!

Pipe selection criteria for heating

Thus, it is clear how heating and tap systems differ from one another. As a result, a set of requirements must be met by the pipes used in their construction. In this instance, choosing pipe material only based on cost would be incorrect.

The pipes in a typical heat system should possess the following qualities:

  • The pipeline must withstand the prolonged exposure to high temperatures of the coolant. In central heating networks, this value is regulated and does not exceed 70-75 ° C. It is more difficult to control the carrier temperature in private networks, so the supply of pipes should be even higher.
  • Pipes should withstand an increase in the pressure of the working environment and related possible negative processes, one of the most dangerous ones of which is considered hydraulic water – a sharp short -term increase in fluid pressure.
  • The design of the pipe should have a smooth inner surface that prevents the formation of blockages, as well as the accumulation of deposits. This condition is satisfied with all types of plastic pipes.
  • The material from which the pipe is made should have a small coefficient of thermal expansion. This will avoid deformation (in the worst case – mechanical damage) of the pipeline during operation.
  • The material should ensure resistance to corrosion and the effects of aggressive chemical media.
  • Pipes should have durability, comparable or exceeding the life of other elements of the heating system.
  • The circulation of the coolant should occur as quieter as possible. In plastic products, as a rule, there are no problems with this, but in metal pipelines, swirls of liquid are often created, accompanied by a strong noise.
  • Aesthetic component. The pipeline should organically fit into the interior of the room.

We advise you to acquaint yourself with the following: how do you properly solder plastic pipes?

These requirements are fully met by a variety of polymer pipe types produced by modern industry.

Positive qualities of plastic pipes

Comparing plastic heating pipes to comparable metal products, a number of their advantages set them apart.

It is important to emphasize the following primary benefits of plastic pipes:

  • Plastic heating pipes are not afraid of a humid environment. Plastic is a polymer, and such material, as you know, does not interact with chemical and other aggressive substances.
  • Due to its corrosion resistance and inappropriation of decay, such pipes may well last up to fifty years.
  • Plastic heating pipes are considered environmentally friendly, because toxic compounds are not released from them.
  • During the transportation of water to such pipes, they do not make noise. All because the plastic is worse misses the sound. In addition, plastic pipes are not collected on plastic pipes, which positively affects their bandwidth.
  • The plastic has small thermal conductivity, which is very important for constructing a heating system. This can be considered its main advantage over steel pipes, in which water quickly becomes cold.
  • The characteristics of plastic pipes for heating are such that they are more successful with temperature changes. It also makes them indispensable when organizing a heating system in the house.
  • Due to its lightness, they are very easy to transport and lay them up. It is worth noting the fact that the pipes are interconnected by fittings, the method of soldering. The process takes a minimum of time, and the pipes themselves do not need painting, maintaining their aesthetics for a very long time.
  • In addition, they have a low cost. Steel pipes will cost much more.

Pipe from stitched polyethylene (re-x)

Due to its altered molecular structure, sewed polyethylene is different from conventional polyethylene in that it can be utilized to create pipelines for heating systems as well as cold water supplies. The re-pipe can withstand 7 bar of pressure at 95 °C working temperature, which is equivalent to an unoccupied polypropylene pipe PN 20.

A steam-coated polyethylene pipe placed within the heat-distribution plates of a floor heated by water.

Flexibility, resistance to frost, and the capacity to revert to its original shape in the event of deformation due to increased load are characteristics that set the re-pipe apart. This feature is used during installation: a pipe end extender is used to quickly stretch the pipe and attach the connecting fitting. As the pipe reverts to its original diameter, the fitting is securely covered, resulting in a dependable connection.

En ISO 15875 approved Uponor Radi Pipe 40 × 5.5 steamed polyethylene pipe.

Because the re-pp can be produced in bays up to 200 m long, it can be divided into segments of any length.

2 a huge number of joints

These products are often connected because they are sold in pieces of 2-4 meters rather than in bays. Different turns and angles also result in an increase in the number of joints. There may be roughly 100 of these joints on a house’s heating system with a 100 m2 area. Moreover, the majority of polypropylene pipes will be concealed by plaster if you consider that they are typically made for concealed installation.

Remember that two pieces of pipe must be soldered together to complete the connection, and this must be done by a person. In the event that someone overexposed or failed to hold the pipe in the apparatus, the connection becomes unreliable and eventually starts to flow. In this instance, the wall will need to open.

High-quality soldering iron for welding pipes Candan CM-03

Which plastic pipes are best chosen for heating?

You must research the characteristics and benefits of each type of pipe in order to select ones that are appropriate for your particular heating system variant as well as your budget.

Pipes made of polypropylene. The least expensive heating option. The high coefficient of linear expansion of polypropylene pipes is a major disadvantage. During the heating season, the trunk mounted on PP pipes can deform, bending and sagging, which significantly impairs the system’s performance and aesthetic appeal. Only when you are certain that there won’t be any pressure drops or system temperature drops throughout the winter can you make an informed decision about whether or not to use such plastic pipes for heating.

Polypropylene pipes reinforced. a range of pipe pp that has been enhanced by an extra layer of foil or fiberglass. The installation process for fiberglass-reinforced plastic pipes is the same as that of standard PP products. Simultaneously, structures made of protected polypropylene pipes become several times stronger. These pipes are the best options available on the market today.

Reinforced using PP pipe and aluminum foil. Technically speaking, they are identical to plastic heating pipes reinforced with fiberglass. The only negative aspect of them is that installation requires extra labor. Prior to soldering from the metal layer, the ends of the aluminum-reinforced pipe should be released. Polypropylene pipe stripping is an easy task that you can complete with just your hands.

Polypropylene is one of the most widely used materials for heating pipes; systems made of it can even be installed in a closed manner.

Excellent guidance! It is preferable to purchase foil-reinforced pipes if the system’s total pressure is unknown. Compared to fiberglass reinforcement, they are more resilient to pressure drops.

Stitched polyethylene pipe. High-quality plastic pipes intended for underfloor heating and central heating. The properties of plastic heating pipes are similar to those of reinforced pp pipes. Installing a heating plastic pipe like this by hand calls for specific knowledge and clamping tools that aren’t always available around the house. Thus, when installation will be done by experts, it makes sense to buy polyethylene pipes.

Plastic-metal pipes. These products have a similar design to aluminum-reinforced polypropylene pipes, but their walls are thinner. It’s difficult to select high-quality metal plastic; you can frequently buy a fake. Over time, metal-plastic pipes that were manufactured with little regard for technology become less rigid.

Note the technical characteristics of pipe PP

Systems for hot water transportation and heating can also employ polypropylene pipes. However, due to their slightly worse working properties than the previously mentioned materials, pipes made of this material are not as commonly used.

Polypropylene exhibits the following functional qualities:

  • It is allowed to use in systems with a coolant up to 70 ° C;
  • maximum working pressure in maximum temperature conditions is 10 bar;
  • maximum working pressure at temperature indicators from 0 to 25 ° C is 25 bar;
  • peak temporal temperature can increase to 90 ° C;
  • When using polypropylene pipes with the above characteristics, their service life may well be 50 years.

Contacting the diameter of the junction

When welding pipes, the diameter of the joint may be directly conserved, or brewed. By reducing the diameter of the connection, an inexperienced installer or you (if this is your first time soldering) can breech the connection. As a result, the duct gets worse and the pipeline’s resistance rises. Should these "jambs" extend somewhat along the entire pipeline, the heating system’s performance could deteriorate markedly.

Regrettably, while installing pipes in apartment buildings, these "jambs" are frequently discovered, so exercise caution when selecting installers.

Selecting the appropriate pipes for your home’s heating system is essential for both longevity and efficiency. Plastic pipes are a common option because of their affordability, flexibility, and longevity. But with so many different styles and sizes to choose from, it’s crucial to know which one works best for your heating system. This post will compare different types of plastic pipes for heating, examine their various sizes, and go over key considerations for decision-making. Knowing your options will help you choose the best heating system for your house, whether you’re replacing an old one or installing a new one.

Types of polymer pipes for heating pipelines

Three different kinds of plastic pipes for heating systems are currently available on the market. Various polymers are used to make products.

  • Pipe from stitched polyethylene.
  • Polypropylene pipes.
  • Metal -plastic products.

Installation of a dependable and long-lasting heating system is possible with any kind of pipe. Nonetheless, certain aspects of how these heating systems work will depend on the characteristics of each material.

Pipe from stitched polyethylene

The cost of polyethylene pipes and the components that connect to them is higher than that of polypropylene equivalents. Additionally, since no special tool is needed, mounting such products is simpler. Particularly when they are preheated, polyethylene pipes are easily bent.

Take note: The term "sewn" does not in any way indicate that the pipes have joints or seams. This pertains more to the internal organization of the material used to make the pipe, specifically to the arrangement of the molecules in a specific order.

The plastic pipes of this type exhibit the highest resistance against freezing in multiple media. Temperature range for operation: -50 to 100 °C. The lifespan of a pipeline made of stitched polyethylene can reach 50 years when subjected to these conditions.

One of the drawbacks of polyethylene pipes is that the material is susceptible to UV light. To reduce this detrimental impact, a protective shell is now offered on a large number of modern products.

Polypropylene pipes

Small value is the primary benefit of polypropylene pipes.

Installation simplicity, which is frequently mentioned, varies greatly. First, a specialized welding machine will be needed for installation. The gadget is expensive and needs specific knowledge.

Second, it is nearly impossible to inspect the quality of the welded joint in polypropylene because it depends on so many variables. from the master’s credentials, the welding machine’s state, the ideal heating temperature, and the exposure duration.

Take note: Inadequate endurance can eventually result in a leak, and overheating can melt the inner plastic layer and lower the pipeline’s throughput.

Linear elongation is yet another disadvantage of polypropylene pipelines. When heated, even reinforced products can lengthen noticeably, which frequently results in a change in the pipeline’s configuration.

We advise you to become knowledgeable about how to select the appropriate size of plastic pipes for different types of pipelines.

Because of this, it is not advised to use polypropylene in projects where a pipeline is to be filled into a screed.

It is important to keep in mind that not all polypropylene pipe types are appropriate for use with heating systems:

  • The first type. PP-H label. Not intended for networks with high carrier temperatures. It is used for the most part in ventilation and cold water supply systems.
  • The second type. Marking PP-B (PP-2). It is often used in networks with low media temperatures, for example, warm floor systems.
  • The third type. PPRC marking (PPR, PP-3). Resistant to compression influences and high temperatures. Best suited for the construction of heating systems.

Metal -plastic products

The kind of pipes used in heating systems the most frequently. The pipe’s multilayer structure—two layers of stitched polyethylene, two layers of glue, and an aluminum insert sandwiched in between—allows it to withstand high temperatures and bend products with ease without the need for a specialized tool. A high degree of flexibility will make the number of connecting elements much smaller.

Plastic made of metal has good soundproofing properties and doesn’t condense. Bays produce pipes, and epaulet meters sell them. This makes waste reduction possible.

Fittings, which are ironically thought to be the weakest component of these heat systems, are used to connect the pipeline sections:

  • Threaded joints are easily mounted, but are not considered reliable and durable. In addition, the cost of such fittings is unreasonably high.
  • Press-fiting are considered more reliable, but special squeezing ticks are required for their installation. This compound is non -graceful.

A variety of heating pipes from polypropylene and their properties

PPR polypropylene is used to make polypropylene pipes. He also has great strength and heat resistance by nature.

It is important to remember that polypropylene pipes differ slightly from other types of plastic products. Due to their high fluidity, they are influenced by the power of attraction and change over time.

Thus, the answer is yes if you’re wondering if it’s feasible to heat this kind of food using plastic pipes. When organizing internal wiring, it’s important to use more fasteners.

Compared to other polymer pipes, polypropylene pipes are more rigid. In this sense, you will need to use more rotary fittings and pay attention to large radii for bends. As a result, using polypropylene pipes is thought to be more expensive than using other alternatives.

The dimensions of plastic pipes for heating systems: how to choose the right thing

The effectiveness of the system’s operation depends on selecting the diameter correctly. The following factors must be considered when calculating the pipe section:

  • wiring scheme;
  • the speed of the coolant;
  • diameters of the pressure and reverse boiler pipes;
  • calculated decrease in the temperature of the liquid in batteries;
  • The value of the resistance coefficient.

However, with a complex wiring scheme, especially when, in addition to radiators, a warm floor is also planned, standard calculation methods are not suitable. Then, to determine the diameter of the pipes, you will have to contact a specialist or consult with neighbors who have a similar system. If it is planned to install heating with compulsory water circulation, it is preferable to choose options with a smaller cross -section. This will facilitate the installation, reduce the volume of heated water. However, you should not get carried away with minimization of diameter, as this will cause a decrease in heat transfer due to increasing the speed of water and the appearance of noise. The optimal speed varies from 0.2 to 1.5 m/s.

The diameter of plastic pipes should be independently calculated using the calculation that 100 watts of thermal energy are needed to heat 1 m² of space up to 3 m in height. Therefore, 2 kW plus 20% of the reserve is required for a room with one or two 20 m² batteries, equal to 2.4 kW. According to the table, pipes between 8 and 10 mm in diameter are appropriate for transmitting this kind of power. Although the outcome is imprecise, it will assist in estimating the cost of purchasing pipes.

Technical characteristics of metal -plastic pipes

It is permissible to transport hot and cold water via metal and plastic pipes.

The following are the functions of this kind of plastic heating pipe:

  • maximum working temperature indicators should not exceed 95 ° C;
  • At this temperature, the maximum pressure in the system should be 10 bar;
  • At water temperature from 0 to 25 ° C, the pressure can reach 25 bar;
  • permitted peak temporal temperature – 130 ° C;
  • The service life of such pipes – 50 years – this is provided that the material from the above parameters.

Features of installation

Items composed of polyvinyl chloride that has been chlorinated cannot be soldered. Special high molecular weight glue holds them together. Due to the liquid composition’s composition of polyvinyl chloride mixed with a solvent, the process is essentially the same as cold soldering. Due to issues guaranteeing immobility during this time, the connection in difficult-to-reach areas is complicated because polymerization takes several minutes.

The installation of PVC pipes for heating is so easy that one person without any special training can do it. Since communication is not subjected to large loads, the laying can be completed without compensators due to the low temperature expansion. Hence, silent sliding fasteners will suffice. It is possible to install risers inside the outer walls without the need for additional insulation against the cold because of low thermal conductivity. Special fittings, such as seats and Americans or free flanges, are used to connect to radiators and metal pipes.

The installation process is completed in the following order:

  1. The branching system is evaluated.
  2. The assembly of the most complex knees is made.
  3. The remaining connections are mounted at the installation site.

Metal connection with plastic in shaped products

A metal insert is present in certain connecting parts. Because metal and plastic expand and contract differently in response to temperature changes, a leak may occur in their connection. Of course, using shaped products from dishonest manufacturers can lead to a similar situation. As a result, we advise against saving money and instead to purchase connections from reputable manufacturers, which are slightly more expensive.

We can suggest FV-Plast companies as being good; Kalde or Valtec are also appropriate. Although not the cheapest, their water supply is of excellent quality.

The longevity and efficiency of your heating system depend on the pipes you choose. Plastic pipes are becoming a popular option because they are inexpensive, long-lasting, and simple to install. When choosing plastic pipes for your heating system, take into account aspects like brand reputation, size, and material.

For heating systems, plastic pipes come in a variety of sizes, including 10mm, 15mm, 22mm, and 28mm. Your home’s heating needs and the kind of heating system you have will determine the size you select. To find the right size for your unique needs, it’s imperative to speak with an expert.

It’s crucial to take the material into account when selecting the best plastic pipes for your heating system. The three most popular types of plastic pipes used for heating are polyethylene (PEX), polybutylene (PB), and polypropylene (PP). Before choosing a material, it is crucial to conduct research and make comparisons as each has pros and cons.

In conclusion, careful consideration of elements like size, material, and brand reputation is necessary when choosing the proper plastic pipes for your heating system. You can help extend the lifespan of your heating system and guarantee effective operation for many years to come by selecting high-quality pipes and making sure they are installed correctly.

What type of heating you would like to have in your home?
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