Laying heating pipes under the floor covering is considered one of best options heating a house or apartment. They consume fewer resources to maintain the specified temperature in the room, exceed standard wall-mounted radiators in terms of reliability, distribute heat evenly in the room, rather than creating separate “cold” and “hot” zones.
Length of the water heated floor contour - the most important parameter, which must be determined before starting installation work. The future power of the system, the heating level, and the choice of components and structural units depend on it.
Builders use four common pipe laying patterns, each of which is better suited for use in different room shapes. Their “pattern” largely depends on maximum length heated floor contour. This:
The chosen installation option affects the maximum length of the water floor, because the number of pipe loops and the bending radius change, which also “eats” a certain percentage of the material.
The maximum length of the underfloor heating pipe for each circuit is calculated separately. To get the required value you will need the following formula:
Sh*(D/Shu)+Shu*2*(D/3)+K*2
The values are indicated in meters and mean the following:
The length of the heated floor contour obtained as a result of calculations is additionally increased by 5%, which includes a small margin for leveling out errors, changing the bending radius of the pipe and connecting to fittings. 
As an example of calculating the maximum length of a pipe for a heated floor for 1 circuit, let’s take a room of 18 m2 with sides of 6 and 3 m. The distance to the collector is 4 m, and the laying step is 20 cm, we get the following:
3*(6/0,2)+0,2*2*(6/3)+4*2=98,8
5% is added to the result, which is 4.94 m and the recommended length of the water heated floor circuit increases to 103.74 m, which is rounded up to 104 m.
The second most important characteristic is the diameter of the pipe used. It directly affects the maximum length, the number of circuits in the room and the power of the pump, which is responsible for circulating the coolant.
In apartments and houses with medium-sized rooms, pipes of 16, 18 or 20 mm are used. The first value is optimal for residential premises; it is balanced in terms of costs and performance. The maximum length of a water heated floor circuit with 16 pipes is 90-100 m, depending on the choice of pipe material. It is not recommended to exceed this figure, because the so-called “locked loop” effect may occur when, regardless of the power of the pump, the movement of the coolant in the communication stops due to high fluid resistance.
To choose the optimal solution and take into account all the nuances, it is better to contact our specialist for advice. 
The installation of the heating system must comply with the following recommendations:
If the maximum length of the heated floor loop 16 pipes exceeds the recommended value, then the room is divided into separate circuits, which are connected into one heating network by a manifold. To ensure uniform distribution of coolant throughout the system, experts advise not to exceed the difference between individual loops of 15 m, otherwise the smaller circuit will heat up much more than the larger one.
But what to do if the length of the heated floor contour of a 16 mm pipe differs by a value that exceeds 15 m? Balancing fittings will help, changing the amount of coolant circulating through each loop. With its help, the difference in lengths can be almost two times. 
Also, the length of the heated floor contours for pipe 16 affects the heating level. To maintain a comfortable indoor environment, a certain temperature is needed. To do this, the water pumped through the system is heated to 55-60 °C. Exceeding this indicator may have a detrimental effect on the integrity of the material. engineering communications. Depending on the purpose of the room, on average we get:
In accordance with the maximum length of the underfloor heating circuit of 16 mm in 90-100 m, the difference at the “input” and “output” of the mixing boiler should not exceed 5 °C, a different value indicates heat loss on the heating main.
Floor heating is one of the most effective and cost-effective ways to heat rooms. Judging from the point of view of operating costs, water “warm floor” looks preferable, especially if the house already has a water heating system. Therefore, despite quite high complexity installation and debugging of water heating, it is often chosen.
Work on a water-heated floor begins with its design and calculations. And one of the most important parameters will be the length of the pipes in the laid circuit. The point here is not only, and not so much, the cost of material - it is important to ensure that the length of the circuit does not exceed the permissible maximum values, otherwise the operability and efficiency of the system is not guaranteed. The calculator for calculating the length of the water heated floor circuit, located below, can help with the necessary calculations.
Several necessary explanations for working with the calculator are given below.
By warm floor It’s pleasant to walk, there is no discomfort from the cold underfoot and stuffiness in the upper part of the room. A well-equipped system allows you to evenly heat all areas of the rooms, creating comfort and saving money on heating. Installing a heated floor is relatively simple, but the efficiency of the heating circuit depends entirely on the correctness of the calculations when preparing the project.
In order for the warm floor to create the desired climate and not cause inconvenience or utility accidents, the room in which this heating circuit will be installed must meet the following requirements:
If the above requirements are met, the “warm floor” system will be installed without problems. However, its effectiveness depends not only on the size of the room, but also on its other features, which the following recommendations will help you take into account:
For the proper functioning of this heating system, a clear sequence of layers of the so-called “pie” of the heated floor is important.
The thermal circuit is laid on a previously heat- and waterproofed surface, and poured or backfilled on top cement screed, on top of which the finishing flooring. The above layers - the pie shell - are required in both cases. They protect the system from external influences and increase its efficiency.
Warm floors are an excellent solution for improving your home. The floor temperature directly depends on the length of the heated floor pipes hidden in the screed. The pipe in the floor is laid in loops. In fact, from the number of loops and their length it adds up total length pipes. It is clear that the longer the pipe in the same volume, the warmer the floor. In this article we will talk about restrictions on the length of one heated floor circuit.
Approximate design characteristics for pipes with a diameter of 16 and 20 mm are: 80-100 and 100-120 meters, respectively. These data are approximate approximate calculations. Let's take a closer look at the process of installing and pouring heated floors.
Let's figure out what consequences an increase in the length of the heated floor pipe can lead to. One of the reasons is the increase hydraulic resistance, which will create additional load on the hydraulic pump as a result of which it may fail or may simply not cope with the task assigned to it. The resistance calculation consists of many parameters. Conditions, installation parameters. The material of the pipes used. Here are the three main ones: loop length, number of bends and thermal load at her.
It is worth noting that the thermal load increases with increasing loop. The flow speed and hydraulic resistance also increase. There are restrictions on flow speed. It should not exceed 0.5 m/s. If we exceed this value, various noise effects may occur in the pipeline system. The main parameter for which this calculation is made also increases. Hydraulic resistance of our system. There are restrictions on it too. They amount to 30-40 kP per loop.
The next reason is that as the length of the heated floor pipe increases, the pressure on the walls of the pipe increases, causing this section to lengthen when heated. The pipe located in the screed has nowhere to go. And it will begin to narrow at its weakest point. The narrowing can cause blockage of the flow in the coolant. For pipes made from different material, different coefficient extensions. For example, at polymer pipes the expansion coefficient is very high. All these parameters must be taken into account when installing a heated floor.
Therefore, it is necessary to fill the heated floor screed with pressed pipes. Pressure better with air with a pressure of approximately 4 bar. This way, when you fill the system with water and start heating it, the pipe in the screed will have room to expand.
Taking into account all the above reasons, taking into account corrections for the linear expansion of the pipe material, we will take as a basis the maximum length of underfloor heating pipes per circuit:
The table shows the optimal dimensions for the length of a heated floor that are suitable for all modes of thermal expansion of pipes in various operating modes.
Note: B residential buildings 16 mm pipe is enough. A larger diameter should not be used. This will lead to unnecessary energy costs
Warm floors are an excellent solution for improving your home. The floor temperature directly depends on the length of the heated floor pipes hidden in the screed. The pipe in the floor is laid in loops. In fact, the total length of the pipe is determined by the number of loops and their length. It is clear that the longer the pipe in the same volume, the warmer the floor. In this article we will talk about restrictions on the length of one heated floor circuit.
Approximate design characteristics for pipes with a diameter of 16 and 20 mm are: 80-100 and 100-120 meters, respectively. These data are provided as approximate estimates. Let's take a closer look at the process of installing and pouring heated floors.
Let's figure out what consequences an increase in the length of the heated floor pipe can lead to. One of the reasons is an increase in hydraulic resistance, which will create additional load on the hydraulic pump, as a result of which it may fail or simply may not cope with the task assigned to it. The resistance calculation consists of many parameters. Conditions, installation parameters. The material of the pipes used. Here are the three main ones: loop length, number of bends and thermal load on it.
It is worth noting that the thermal load increases with increasing loop. The flow speed and hydraulic resistance also increase. There are restrictions on flow speed. It should not exceed 0.5 m/s. If we exceed this value, various noise effects may occur in the pipeline system. The main parameter for which this calculation is made also increases. Hydraulic resistance of our system. There are restrictions on it too. They amount to 30-40 kP per loop.
The next reason is that as the length of the heated floor pipe increases, the pressure on the walls of the pipe increases, causing this section to lengthen when heated. The pipe located in the screed has nowhere to go. And it will begin to narrow at its weakest point. The narrowing can cause blockage of the flow in the coolant. Pipes made from different materials have different expansion coefficients. For example, polymer pipes have a very high expansion coefficient. All these parameters must be taken into account when installing a heated floor.
Therefore, it is necessary to fill the heated floor screed with pressed pipes. It is better to pressurize with air at a pressure of about 4 bar. This way, when you fill the system with water and start heating it, the pipe in the screed will have room to expand.
Taking into account all the above reasons, taking into account corrections for the linear expansion of the pipe material, we will take as a basis the maximum length of underfloor heating pipes per circuit:
What length of underfloor heating pipe will be optimal?
Let's find out the optimal length of the heated floor pipe and what the consequences may be if the circuit is longer. Everything in our article
One of the conditions for the implementation of high-quality and proper heating The purpose of a room using a heated floor is to maintain the temperature of the coolant in accordance with the specified parameters.
These parameters are determined by the project, taking into account the required amount of heat for the heated room and floor covering.
To maintain a given temperature in the room, it is necessary to correctly calculate the length of the loops used to circulate the coolant.
First, you need to collect the initial data on the basis of which the calculation will be performed and which consists of the following indicators and characteristics:
Based on the listed data, you can correctly calculate the length of the heated floor circuit and thereby ensure comfortable temperature regime indoors with minimal costs to pay for energy supply.
The temperature on the surface of a floor made with a water heating device underneath depends on functional purpose premises. Its values should be no more than those indicated in the table:
The laying pattern can be made with a regular, double and corner snake or snail. Various combinations of these options are also possible, for example, along the edge of the room you can lay out a pipe like a snake, and then the middle part - like a snail.
IN large rooms For complex configurations, it is better to lay them in a snail shape. In rooms of small size and having a variety of complex configurations, snake laying is used.
The pipe laying pitch is determined by calculation and usually corresponds to 15, 20 and 25 cm, but no more. When laying pipes at intervals of more than 25 cm, a person’s foot will feel the temperature difference between and directly above them.
Along the edges of the room, the heating circuit pipe is laid in increments of 10 cm.
This depends on the pressure in a particular closed loop and hydraulic resistance, the values of which determine the diameter of the pipes and the volume of liquid that is supplied to them per unit time.
When installing a heated floor, situations often occur when the circulation of the coolant in a separate loop is disrupted, which cannot be restored by any pump; water is blocked in this circuit, as a result of which it cools down. This results in pressure losses of up to 0.2 bar.
Based practical experience, you can adhere to the following recommended sizes:
To more accurately determine the size of the loop length for a heated floor in the room in question, in which there will be no problems with coolant circulation, it is necessary to perform calculations.
For example, it is necessary to install a heated floor system in several rooms, one of which, say a bathroom, has an area of 4 m2. This means that heating it will require 40 m of pipe. It is impractical to arrange 40 m loops in other rooms, whereas 80-100 m loops can be made.
The difference in pipe lengths is determined by calculation. If it is impossible to perform calculations, you can apply a requirement that allows a difference in the length of the contours of the order of 30-40%.
Also, the difference in loop lengths can be compensated by increasing or decreasing the diameter of the pipe and changing the pitch of its installation.
The number of loops that can be connected to one collector and one pump is determined depending on the power of the equipment used, the number of thermal circuits, the diameter and material of the pipes used, the area of the heated premises, the material of the enclosing structures and many other various indicators.
Such calculations must be entrusted to specialists who have knowledge and practical skills in carrying out such projects.
Having collected all the initial data, having considered possible options creating a heated floor and having determined the most optimal one, you can proceed directly to calculating the length of the water heated floor circuit.
To do this, you need to divide the area of the room in which the loops for water floor heating are laid by the distance between the pipes and multiply by a factor of 1.1, which takes into account 10% for turns and bends.
You can determine the length of the loop laid in increments of 20 cm in a room of 10 m2, located at a distance of 3 m from the collector, by following these steps:
In this room it is necessary to lay 61 m of pipe, forming a thermal circuit, to ensure the possibility of high-quality heating of the floor covering.
The presented calculation helps create conditions for maintaining comfortable temperature air in small separate rooms.
To correctly determine the pipe length of several heating circuits for large quantity premises powered from one collector, it is necessary to involve a design organization.
She will do this with the help of specialized programs that take into account many different factors on which uninterrupted water circulation, and therefore high-quality floor heating, depends.
Optimal length of the heated floor contour
One of the conditions for high-quality and proper heating of a room using a heated floor is the optimal length of the heated floor circuit.
Folk wisdom calls for measuring seven times. And you can't argue with that.
In practice, it is not easy to realize what has been repeatedly replayed in your head.
In this article we will talk about the work associated with the communications of a warm water floor, in particular we will pay attention to the length of its contour.
If we plan to install a water heated floor, the length of the circuit is one of the first issues that needs to be dealt with.
The underfloor heating system includes a considerable list of elements. We are interested in tubes. It is their length that defines the concept of “maximum length of a warm water floor.” They must be laid taking into account the characteristics of the room.
From this we get four options, known as:
If you do correct styling, then each of listed types will be effective for heating the room. The length of the pipe and the volume of water may (and most likely will) be different. The maximum length of the water heated floor circuit for a particular room will depend on this.
There are no tricks here; on the contrary, everything is very simple. For example, we chose the snake option. We will use a number of indicators, among which is the length of the water heated floor circuit. Another parameter is diameter. Pipes with a diameter of 2 cm are mainly used.
We also take into account the distance from the pipes to the wall. Here they recommend laying within the range of 20-30 cm, but it is better to place the pipes clearly at a distance of 20 cm.
The distance between the pipes is 30 cm. The width of the pipe itself is 3 cm. In practice, we get a distance between them of 27 cm.
Now let's move on to the area of the room.
This indicator will be decisive for such a parameter of a warm water floor as the length of the circuit:
Our indicators now make it possible to calculate the length of the pipeline: 15x3.4 = 51 m. The entire circuit will take 56 m, since we should also take into account the length of the so-called. collector section, which is 5 m.
One of the following questions: what is the maximum length of a water heated floor circuit? What to do if the room requires, for example, 130 or 140-150 m of pipe? The solution is very simple: you will need to make more than one circuit.
The main thing in the operation of a water heated floor system is efficiency. If, according to calculations, we need 160 m of pipe, then we make two circuits of 80 m each. After all, the optimal length of the water-heated floor circuit should not exceed this figure. This is due to the ability of the equipment to create the necessary pressure and circulation in the system.
It is not necessary to make the two pipelines absolutely equal, but it is also not desirable for the difference to be noticeable. Experts believe that the difference may well reach 15 m.
We have also prepared the following useful information for you:
To determine this parameter we must consider:
The listed parameters are determined, first of all, by the diameter of the pipes used for a warm water floor, and the volume of coolant (per unit of time).
In the installation of heated floors there is a concept - the so-called effect. locked loop. We are talking about a situation where circulation through the loop will be impossible, regardless of the power of the pump. This effect inherent in a situation of pressure loss calculated at 0.2 bar (20 kPa).
In order not to confuse you with long calculations, we will write a few recommendations, proven by practice:
Thus, the maximum length of a pipe for a warm water floor depends on a number of parameters, the main of which is the diameter and material of the pipe.
Read on our website about which flooring is best to choose for a warm water floor:
And also find out more here about how to make a warm water floor with your own hands.
Naturally, the ideal situation would be when the loops are the same length. In this case, no adjustments or searches for balance will be needed. But this is mostly in theory. If you look at practice, it turns out that it is not even advisable to achieve such an equilibrium in a warm water floor.
The fact is that it is often necessary to lay heated floors in a facility consisting of several rooms. One of them is emphatically small, for example, a bathroom. Its area is 4-5 m2. In this case, a reasonable question arises: is it worth adjusting the entire area for a bathroom, dividing it into tiny sections?
Since this is not advisable, we approach another question: how not to lose pressure. And for this purpose, elements such as balancing valves have been created, the use of which consists in equalizing pressure losses along the circuits.
Again, you can use calculations. But they are complex. From the practice of carrying out work on installing a warm water floor, we can safely say that the variation in the size of the contours is possible within 30-40%. In this case, we have every chance to get the maximum effect from using a warm water floor.
Another frequently asked question: how many circuits can operate on one mixing unit and one pump?
The question, in fact, needs to be more specific. For example, to the level - how many loops can be connected to the collector? In this case, we take into account the diameter of the collector, the volume of coolant passing through the unit per unit of time (calculation is in m3 per hour).
We need to look at the technical data sheet of the unit, where the maximum coefficient is indicated bandwidth. If we carry out the calculations, we will get the maximum figure, but we cannot count on it.
One way or another, the device indicates the maximum number of circuit connections - usually 12. Although, according to calculations, we can get 15 or 17.
The maximum number of outputs in the collector does not exceed 12. Although there are exceptions.
We saw that installing a warm water floor is a very troublesome task. Especially in the part where we're talking about about the length of the contour. Therefore, it is better to contact specialists so as not to redo a not entirely successful installation, which will not bring the effectiveness that you expected.
Laying and calculating the maximum length of the water heated floor circuit
The article contains detailed information about the maximum length of the water heated floor circuit, the location of the pipes, optimal calculations, as well as the number of circuits with one pump and whether two identical ones are needed.
Laying heating pipes under the floor covering is considered one of the best options for heating a house or apartment. They consume fewer resources to maintain the specified temperature in the room, exceed standard wall-mounted radiators in terms of reliability, distribute heat evenly in the room, rather than creating separate “cold” and “hot” zones.
The length of the water heated floor contour is the most important parameter that must be determined before installation work begins. The future power of the system, the heating level, and the choice of components and structural units depend on it.
Builders use four common pipe laying patterns, each of which is better suited for use in different room shapes. The maximum length of the heated floor contour largely depends on their “pattern”. This:
The chosen installation option affects the maximum length of the water floor, because the number of pipe loops and the bending radius change, which also “eats” a certain percentage of the material.
The maximum length of the underfloor heating pipe for each circuit is calculated separately. To get the required value you will need the following formula:
The values are indicated in meters and mean the following:
The length of the heated floor contour obtained as a result of calculations is additionally increased by 5%, which includes a small margin for leveling out errors, changing the bending radius of the pipe and connecting to fittings.
As an example of calculating the maximum length of a pipe for a heated floor for 1 circuit, let’s take a room of 18 m2 with sides of 6 and 3 m. The distance to the collector is 4 m, and the laying step is 20 cm, we get the following:
5% is added to the result, which is 4.94 m and the recommended length of the water heated floor circuit increases to 103.74 m, which is rounded up to 104 m.
The second most important characteristic is the diameter of the pipe used. It directly affects the maximum length, the number of circuits in the room and the power of the pump, which is responsible for circulating the coolant.
In apartments and houses with medium-sized rooms, pipes of 16, 18 or 20 mm are used. The first value is optimal for residential premises; it is balanced in terms of costs and performance. The maximum length of a water heated floor circuit with 16 pipes is 90-100 m, depending on the choice of pipe material. It is not recommended to exceed this figure, because the so-called “locked loop” effect may occur when, regardless of the power of the pump, the movement of the coolant in the communication stops due to high fluid resistance.
To choose the optimal solution and take into account all the nuances, it is better to contact our specialist for advice.
The installation of the heating system must comply with the following recommendations:
If the maximum length of the heated floor loop 16 pipes exceeds the recommended value, then the room is divided into separate circuits, which are connected into one heating network by a manifold. To ensure uniform distribution of coolant throughout the system, experts advise not to exceed the difference between individual loops of 15 m, otherwise the smaller circuit will heat up much more than the larger one.
But what to do if the length of the heated floor contour of a 16 mm pipe differs by a value that exceeds 15 m? Balancing fittings will help, changing the amount of coolant circulating through each loop. With its help, the difference in lengths can be almost two times.
Also, the length of the heated floor contours for pipe 16 affects the heating level. To maintain a comfortable indoor environment, a certain temperature is needed. To do this, the water pumped through the system is heated to 55-60 °C. Exceeding this indicator may have a detrimental effect on the integrity of the utility material. Depending on the purpose of the room, on average we get:
In accordance with the maximum length of the underfloor heating circuit of 16 mm in 90-100 m, the difference at the “input” and “output” of the mixing boiler should not exceed 5 °C, a different value indicates heat loss on the heating main.
Maximum length of the water-heated floor circuit: laying and calculating the optimal value
Laying heating pipes under the floor covering is considered one of the best options for heating a house or apartment. They consume fewer resources to maintain the specified temperature in the room, exceed standard wall-mounted radiators in terms of reliability, and evenly distribute heat in the room rather than creating separate
