Pump-mixing units for underfloor heating: principle of operation, connection. Warm water floor layout

When heating private houses in the city and suburban buildings today are often used floor heating systems. Some property owners heat the rooms separately with water floors, while others arrange heated floors throughout the house. In the latter scheme, it is not always possible to use the system without additional mixing units, which ensure that cold streams that go to the heated floors are mixed into the hot water.

Heating using underfloor heating can be combined with heating radiators that require the consumption of hotter water, which is necessary for normal functioning. To ensure such a condition, a submix unit is required, which is installed together with a floor heating system. About its features and characteristics and will be discussed below.In addition, you can find installation information.

Design features of the heated floor, working with the knot

pump and mixing units for underfloor heating

Pump-mixing units for underfloor heating should be used only in tandem with a water heating system. The heating scheme, which operates with the help of the kneading unit, requires the presence of the following units:

  • waterproofing layer;
  • heating boiler;
  • concrete slab;
  • heating fluid;
  • contour for warm floors;
  • high temperature circuit for the radiator.

The concrete slab will act as the basis for the water floor system. If you read the sanitary standards, then you can learn from them that the surface temperature of the floor heating system should not exceed 31 ° C. As for the boiler, it overheats the coolant to 100 ° C. However, taking into account the thickness of the coating of the screed, the temperature in the pipe will not exceed the above-mentioned figure. To do this, the contour of warm floors must be connected using a mixing unit, and not directly to the source of heating.

Pump-mixing units for underfloor heating will not be required if the heat source does not overheat the water.Such a need is no longer necessary if the residents of the house do not use contours with an impressive temperature. Podmes should be present in all other cases, it can be made independently for this, but most often it is purchased in finished form.

Principle of operation

warm water floor scheme

The coolant reaches the collector of the system and stops with a special valve, which is true if the water temperature is above normal. Under pressure, the valve is activated, which supplies water in a cooled form after it passes through the circuit. After the temperature is normalized, the valve returns to its original position. Sometimes pumping and mixing units for underfloor heating are able to maintain the required temperature level, increasing the pressure in the circuit to improve water circulation.

Mixing node assumes the presence of the following nodes:

  • safety valve;
  • circulation pump;
  • bypass;
  • weather control valve;
  • air vent.

A safety valve is required for mixing if the water temperature is too high. To increase the pressure you need a circulation pump, it heats the water evenly.Not all mixing units have a bypass, but it is necessary for protection against overloads. Depending on the requirements, the assembly of the described node occurs in different ways. But in all cases it is placed to the contour of the floor, and the place of fasteners may be different, such as:

  • collector cabinet;
  • room;
  • boiler room.

What else you need to know about the principle of operation

warm floor connection

The installation of the pumping and mixing unit allows redistributing the coolant flow with high temperature. The latter moves along the contour and is at the distribution manifold. There is a safety valve, which has a temperature sensor or thermostat.

As soon as the high water temperature is registered, a damper opens, through which the low temperature liquid will flow. This will provide a mixture of cold liquid or mixing the two streams. When the desired temperature is reached, the supply of hot liquid will automatically stop; this process will be ensured by shutting off the valve.

Connection Features

warm floor in the house

Pump-mixing units for underfloor heating make it possible to ensure the correct operation of the system.The task of this site is to ensure the speed of the coolant. Among other things, this element ensures temperature control in the circuit. The described units are based on a three-way mixing valve or a thermostatic valve. The circulation of the coolant is provided by the pump. This ensures uniform heating throughout the area. The return valve is added to the cooled water by the mixing valve. Hot water flows from the high temperature circuit. This ensures the desired flow temperature.

Part of the cooled water is displayed in a high-temperature circuit. A thermostatic valve in the left node ensures the addition of hot water. Thermostatic valve using a remote sensor measures the temperature of the coolant in the contour of a warm floor. Both versions of the pumping and mixing unit are operational, but most often consumers prefer mixers with a three-way valve. This is especially true when the warm floor has more than three contours.

If there are servo drives on the collector, then in case of overlapping of all circuits, a bypass must be provided, which has a bypass valve.Connecting a heated floor using a pumping and mixing unit sometimes requires additional equipment with a protective device; it will turn off the pump if the water temperature is above normal. These recommendations are correct if you are concerned about accidents that may occur in rooms with expensive flooring.

Location of pumping and mixing unit

heated floor collector assembly

Connecting a heated floor assumes that the master has knowledge of the location of the collector. Before its installation, you should install a metal protective cabinet, which can be closed or open. The collector unit in some cases remains open, because access to it is easier to provide, but the protection of the connection of parts suffers. The location of the cabinet can be selected, given the location of the contours of the floor.

If there are several branches, then the cabinet can be installed in the center, equally removing it from the working circuits. In this case, it will be located close to the main pipes. Such an arrangement ensures the performance of the hydraulic process. The ideal option is a protected wall niche, it allows you to place the details of the collector as carefully as possible and bring the pipeline.If the floors are settled throughout the house, then for large premises need their own distribution nodes.

Installation Features

pump and mixing unit for underfloor heating Price

If you want to equip a warm floor in the house, you should take a closer look at the features of equipment installation. It is necessary to begin work with the installation of shut-off valves and thermometers, the first of which should be located at all loop outputs. These parts, which will regulate the operation of the return flow and supply, should be included in the assembly kit

Using the scheme, it is necessary to correctly and quickly install equipment, connect pipes for drainage and water supply, making it possible to connect several or one heating circuits. Compressor fittings will be used to connect parts. A standard kit is used for fastening some connections; it consists of:

  • ring clamp;
  • bushings;
  • the nuts.

If the diameter of parts does not match, adapters are used.

Floor heating scheme

pump and mixing unit valtec

If you decide to equip a warm floor in the house, you can use an elementary scheme, which consists of a set of shut-off valves and a simple collector. The installation process will be as follows.At the first stage it is necessary to connect two pipes to the distribution unit, one of which will be intended for supply, the other for return. The next step is to connect the elements of the heating circuit, they assume branches, which will move the coolant for the floor heating system.

Features of this scheme will depend on the operation of the boiler. When the temperature in it decreases or the water supply is restricted, the floor temperature will decrease. In order to make the simple circuit more functional, you need to add a circular pump, a drain valve, an air vent and a three-way mixer. Such a selection will provide control of the heating process.

What else you need to know about the floor heating scheme

The simplest scheme of a warm water floor consists of two contours. Stainless steel or brass is used for the distribution system, each of which is a material with excellent resistance to the aggressive effects of water. The collector is located on the wall vertically to ensure the efficiency of all components. This ensures even distribution of water.

Shut-off valves in each circuit must have an automatic or manual opening system. They can be supplemented with electromechanical drives. In the system in question, a manual variation is usually used. The scheme of a warm water floor assumes the presence of valves, one of which is located at the entrance, the other at the exit. With their help adjustment of supply of the hot heat carrier is provided. pump-mixing unit with thermal head

Balancing valves are located in the return crest to adjust the flow between the circuits that are located in the adjacent rooms. The flow meter usually acts as a supplement to the locking mechanisms. The first are used as indicators of water flow. Using them, you can adjust each circuit separately, because the flow meters measure and adjust the volume of water for each of them. This is important for contours with different pipe lengths. On the return ridge it is necessary to arrange the thermal sensor, which is required for partial or complete overlapping of the system. This is done in manual or automatic mode. In the second case, electric servos are used.

Description of the pump and mixing unit VALTEC COMBI

Valtec pump-mixing unit is designed to work in conjunction with water-heated floors, where the coolant has a temperature ranging from 20 to 60 ° C. The device works by mixing water from the return line. By means of a two-way valve regulation is provided.

The valve must be located in the supply manifold, it is controlled by a thermostatic head, which has an external immersion sensor. The latter is located at the exit of the mixing unit. If there is a heating controller in the circuit, then the valve control role is transferred to it. In the mix line, a balancing valve sets the ratio of the water that comes from the return line of the secondary circuit. The additional elements of the node are:

  • bypass with bypass valve;
  • automatic air vent;
  • built-in ball valves for connecting the pump;
  • immersion thermometers.

Specifications node VALTEC COMBI

VT Combi - pump-mixing unit, the thermal power of which reaches 15 watts. This is true if a VRS 25/4 pump is used. With a VRS 25/6 pump in the system, the heat output increases to 20 watts. The installation length of the pump is 180 mm.The center distance of the outputs is equivalent to 200 mm. The temperature of the working medium can reach 90 ° C. The setting range of the thermal head varies from 20 to 60 ° C. The working pressure is 10 bar. The average full service life reaches 15 years.

Description of the pump and mixing unit TIM JH-1036

The connection of this node is carried out in the high-temperature circuit of the system. This device is supplied without a pump. Package includes:

  • lower hydraulic unit;
  • mounting bracket;
  • upper hydraulic unit;
  • thermostatic head.

Specifications TIM JH-1036

Pump-mixing unit for underfloor heating JH1036 can be operated at the same heat transfer temperature as in the above case. The installation length of the pump for this model is 130 mm. Maximum heat output can vary from 10 to 12.5 kW. The maximum working pressure is 10 bar. Thermostatic valve with thermal head can be adjusted from 20 to 65 ° C. You may also be interested in the maximum coefficient of valve capacity, it is equal to 4.8 m3/ h

Description of the pump and mixing unit for floor TIM

Pump-mixing unit for floor heating TIM is designed to create a secondary circulation loop with automatic temperature control. This unit is suitable for installation in the boiler room, which has a remote collector. In addition, installation can be carried out in parallel with radiators in one-pipe and two-pipe systems. A node consists of a pair of hydraulic blocks between which the pump is located. He, by the way, is not included.

The lower hydraulic unit is supplemented with a balancing bypass and a thermostatic valve, it houses the valve head. It automatically regulates the flow of water from the high-temperature circuit so that the temperature of the low-temperature circuit is equal to the set value. The automatic air vent is located on the upper hydraulic unit. This pump-mixing unit with a thermal head is designed for operation with pumps whose installation length is 130 or 180 mm. For ease of installation, there are provided detachable connections for the components of the site and the connection of the collector group.

Description of the pump and mixing unit Oventrop

Pump-mixing unit for floor heating "Oventrop" is used for automatic decentralized stabilization of the temperature in the supply pipe, which is true for warm floors, the area of ​​which reaches 200 m2. At the same time, the heat consumption should be approximately 75 W / m2. This mixing unit consists of the following components:

  • connecting thread;
  • three-way valve;
  • electronic drive;
  • heating regulator;
  • flow temperature sensor;
  • outside air sensor;
  • energy saving circulation pump;
  • thermostat maximum limit.

A complete collector for underfloor heating makes it possible to adjust the temperature in the range of 20 to 50 ° C. The temperature in the flow pipe must not exceed 95 ° C. The operating pressure is 6 bar or less. The temperature in the secondary feed pipe must not exceed 50 ° C.

The height of the coolant is not more than 5.5 m. The power consumption of the node does not exceed 90 watts. The equipment weighs 6.6 kg. This pump-mixing unit for a warm floor, the price of which is 28,100 rubles, is made in Germany, therefore it is appreciated by consumers, because it has high quality.


You can assemble the described assembly with your own hands or purchase it in finished form at the building supermarket. Such a decision will not be cheap, but the consumer will be able to protect himself from possible negative consequences, because the calculations may turn out to be wrong. One of the most common today are mixing nodes "Valtek", which are made in Italy. Their minimum cost is 15,000 rubles. Approximately the same price has the American equivalent of Watts Isotherm.

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