Pipes for underfloor heating - selection, calculation and installation of the nuances of laying

Pipes for underfloor heating

Universal health formula that headshould be kept in the cold, and legs - in the warmth, and is known to all, in practice, easily performed in areas with environmentally friendly water heating floor, the main working elements are pipes for floor heating. The concept of the space heating process is to create a space between the base floor and topcoat pipe network through which coolant is circulated. In most cases, the coolant is heated to the optimum temperature of the water, but can be used ethylene glycol, or antifreeze solution.


  • Types of pipes for hot water underfloor heating
    • PP pipes for floor heating
    • Pipes XLPE
    • Metal-plastic - a set of priorities
    • Copper - expensive, but reliable

  • How to calculate the pipes for floor heating
  • Pipe installation of floor water heating

Types of pipes for hot water underfloor heating

water underfloor heating system uniformlyIt distributes the heat in the room and has advantages over other methods of heating, with proper selection of tubes and calculating the inherent components of the heating system.

So, to the underfloor heating system for a long time and functioned flawlessly for warm water floor pipe must meet the following requirements:

  • durability (optimum service life - not less than 50 years);
  • strength;
  • environmental friendliness;
  • memory effect or a low coefficient of linear expansion;
  • the minimum bending radius, facilitating ease of installation;
  • high heat;
  • soundproofing.

When constructing modern outdoor waterHeating four most popular types of pipes corresponding to a greater or lesser extent, all of the above conditions, and divide them by material of manufacture:

  • polypropylene;
  • polyethylene;
  • metal and plastic;
  • copper.

Polypropylene pipes for floor heating

Polypropylene pipes for floor heating lessothers are used in underfloor hot water heating arrangement, despite the most reasonable prices. Their main drawback - too large bending radius equal to 8 diameters. For example, the corresponding figure of polyethylene pipes - 5 diameters.

This means that when 16 mm diameterPPR pipes can be laid only with a minimum distance of 128 mm, which is not always sufficient to provide thermal design power of the heating system. Also reduces the popularity of polypropylene pipes limit their installation temperature, which should not be below + 15 ° C, ie the installation of this type of pipes in the extreme climatic conditions that differ most Russian regions, is not recommended.

Types of pipes for hot water underfloor heating

Polypropylene Pipes attract value, but they have a large bending radius is limited to installation temperature

Pipes XLPE

Polyethylene, or rather a pipe of cross-linkedpolyethylene, durable, resistant to temperature, successfully combine a good quality and reasonable prices. Their production technology uses a special crosslinking: by treatment under high pressure into the polymer structure, in this case polyethylene, the additional cross-links are formed that provide strength and thermal stability of the finished products. Depending on the method of processing the polyethylene obtained material different crosslinking densities: low (LDPE), medium (MDPE) and high (HDPE). For example, if the usual polyethylene pipe rarely survive prolonged thermal stress at 60 ° C, their analogs XLPE resistant to temperature 100-120 ° C, and their bending radius is equal to 5 diameters. Their disadvantages:

  • hardly keep their shape during installation;
  • the likelihood of anti-diffusion layer damage during installation and pouring concrete screeds.
Types of pipes for hot water underfloor heating

Pipes cross-linked polyethylene, durable, resistant to temperature, successfully combine a good quality and reasonable prices

Metal-plastic - a set of priorities

Composition pipe for floor heating is notonly embodies the best features of metal and plastic pipes, but also to improve them. The result is a symbiosis - one-piece aluminum tube having an inner and an outer polymeric protective layers. The inner polymer coating allows perfectly smooth inner surface and corrosion protection: the walls of the tubes are not destroyed, not covered with scale, durability is increased tubing. The outer protective polymer coating protects the aluminum from external damage. Metal-pipe has the following 5-layer structure:

  1. polymer (polyethylene);
  2. an adhesive layer;
  3. aluminum tube - one-piece, welded "butt" or "lap;
  4. an adhesive layer;
  5. polymer.
Types of pipes for hot water underfloor heating

Composition pipe for floor heating not only embodies the best features of metal and plastic pipes, but also improved their

Metal pipes of differentproducers mainly differ in quality adhesive composition. When subjected to high temperatures the elasticity of the adhesive is reduced, stratified pipe. This defect can be detected by heating the pipe to a fragment of 100-120 ° C, if viewed in cross section product layers, the quality does not comply with underfloor heating. Among the disadvantages of metal pipes should note the following:

  • value by 20-30% higher than the cost of plastic pipes;
  • inclination to the hall in case of exceeding the permissible bending radius.

Copper - expensive, but reliable

Copper pipe for underfloor heating - perfectan option that meets all the conditions of resettlement and underfloor heating provides the highest level of reliability and quality. There is only one drawback, which prevents the widespread use of copper pipes in floor heating systems - their high cost.

Types of pipes for hot water underfloor heating

Copper pipe for underfloor heating - the best option that meets all the conditions of resettlement and underfloor heating provides the highest level of reliability and quality

How to calculate the pipes for floor heating

Korma manufacturing material the right choicepipes for floor heating should consider the coolant pressure in the riser central heating or hot water supply and the area of ​​heated space. Depending on these variables selected optimum pipe diameter: underfloor hot water heating using pipes with a diameter of 16, 20 or 25 mm. Installing structure underfloor pipe smaller than desired diameter often leads to disruption of circulating water therein. The water pressure in the riser can be measured independently, connecting the hydraulic pressure gauge, or to learn the technical department dispensation.

Next the value of which determines the calculation ofpipes for floor heating - its length. Getting to the calculations, it should be noted that the laying of pipe systems start from the walls with windows to hot coolant heats the first cooler air, and then only uniformly distributed throughout the system. In places the room where you plan to install the built-in furniture or other bulky pipes are usually not paved.

To obtain more accurate results, tothis stage it is advisable to also determine which way will be laying the pipes in the floor. Today, the most popular two circuits of water underfloor heating: snake (or zebra) and shell (snail, helix).

Contour "snake" is widely used in the WestEurope attracts the simplicity of calculations and installation. But this circuit does not provide uniform heat distribution and the effect of "zebra" is manifested in significant temperature differences separate floor sections that correspond to the input and output circuits. If the maximum system operating modes are often on separate sites of the floor temperature may exceed the permissible value. The level of comfort of the heating system is reduced, heat loss increases. Laying pipe "snake" is justified in areas with little heat loss and the amplitude of fluctuations in water temperature at the inlet and outlet of about 5 ° C.

How to calculate the pipes for floor heating

Contour laying pipe "snake" involves simple calculations and installation

Contour "snail" is widespread in the vastCIS, in spite of the more complex as compared to the "snake" design features and installation. The popularity of this method of laying pipes due to the uniform distribution of heat across the heated surface of the floor, thanks to the alternation of hot laid parallel to the supply and return pipes of cooled slightly. In this construction, floor heating the coolant return point is exactly in the middle of the pipe length, and the average temperature is unchanged in any part of the floor.

How to calculate the pipes for floor heating

"Snail" Circuit pipe laying provides uniform heat distribution across the heated surface of the floor

Finally, you can start the calculations. On a sheet of graph paper, or any other cell in the need to draw a floor plan based on the input group and windows in a scale of 1:50, and portray on it a scale outline of the future floor heating, from the closest to the riser wall with windows. In accordance with current building regulations underfloor heating pipe must be laid at a distance of 20-25 cm from the walls and pipes step depends on their diameter and is usually 35-50 cm. In the finished drawing is easy to measure the total length of the circuit scale. Multiplying that number by the scale factor of 50, we get the real pipe length in meters, not forgetting to add a further 2 meters to connect to the riser loop.

Pipe installation of floor water heating

Installation of water underfloor heating begins withaligning basis by using a special cement-based solution. On the frozen surface of the layer stack of the polymer foil vapor barrier and insulation for heat shield effect, glued it on tape the joints of aluminum, and the excess is cut so that the edges of the walls went 3-4 cm. Then, the laying of floor heating pipes in the drawing .

Pipe installation of floor water heating

Stages floor heating system installation: foundation, insulation, laying pipe, plate, floor finish

Bending pipes recommended by a specialmounting spring corresponding diameter: it is put on the tube and does not allow it to lean. Pipe bend hands, it is difficult accurately to withstand bending radius and avoid fractures.

Ready loop fix specialplastic fasteners under the tie and connected to the riser. On the input and output circuit pipe fittings installed by treating the compound heat-resistant sealant, and then reconnect them to the exit and entry of the riser, respectively. After completing work on the assembly and fastening underfloor heating circuit, fill the tube with water and check the system for leaks, and then perform a coupler mounted and surface finish.

Underfloor heating water is combined withfloor tiles, linoleum and parquet. It is environmentally friendly and economical, and the efficiency and durability of the floor heating depends to a large degree by the cost of material and pipe, and on the correct design and careful implementation.

Like this? Share it in social. NETWORKS

about the author