Mixing unit for Underfloor heating. Diagram, installation, price

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2019-02-24 14:00:46

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Space heating through Underfloor heating is no longer a novelty. Now many people use this system, if not throughout, then at least in separate rooms, for example, in the bathroom or living room. Warm floor – this increased comfort and safety. However, to achieve these criteria is possible only in case, if you produce a competent calculation of the floor and its installation.

mixing unit for Underfloor heating

A Warm floor is economical, it can realize automatic control of heating temperature, however, despite this, the needs of thermoregulation. Actually, therefore, the necessary mixing unit. Radiant floor heating is connected, as a rule, to the system, which has a temperature of 60-80 °C, while the optimum temperature should not exceed around +35-40 °C. otherwise, overheating of the surface of Underfloor heating will lead to the drying up of floor coverings, furniture, and the room will be stuffy and uncomfortable.

In the presence of certain knowledge, skills and free time the calculation of the floor and its installation can be done independently.

Manifold for Underfloor heating and how it works

Externally, the collector resembles a thick metal pipe, which has outlets equipped with valves. Coolant under pressure enters the tube and is distributed to the taps, the capacity of which is regulated by valves. On the opposite side of the installed pressure gauge or safety valve to drop the pressure.

the calculation of the floor

In Addition, there is a different scheme of work, in which the manifold receives the coolant from the outlets and moves it through the pipe in the opposite direction. In this case, the node installation needs to include two header – collecting and distributing.

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The Standard scheme of the mixing unit floor includes the following elements:

  • Connected to the manifold thermostatic valve;
  • Thermostatic head with remote sensor;
  • The valve;
  • Temperature limiter;
  • Thermometer.
  • Non-return valve;
  • Filter;
  • Pump.

Collectors are of two types: two - and three-way valves.

Node-way mixing valves

Many experts make a choice in favor of the collector, considering it more correct. In such a device there is a constant dilution of the hot coolant with cold water from the return pipe, which makes it warm floors to overheat. Two-way valve is endowed with a low capacity, this fact provides a smooth and constant adjustment of temperature. This mixing unit for floor heating the most common, however, to install it in premises with an area of more than 200 m2 is meaningless.

Node of the mixing three-way valves

This design uses three-way mixing valves. The task of such a manifold is to mix hot water from the boiler and cold, coming from “return”. Often these valves are equipped with actuators that allow you to manage and dependent of weather controllers, and thermostats.

This mixing unit for Underfloor heating is the most versatile, although it has some inherent drawbacks:

  • There is a possibility that the thermostat will trigger a full opening valve that will let the system hot coolant, which can lead to burst pipes because of the established high pressure.
  • In addition, the three-way manifold valves have high capacity, it may have a negative impact on warm floors. Even a slight displacement of the control valve can significantly affect the surface temperature.

However, despite these disadvantages, this type of mixing unit is indispensable in large-scale heating systems and construction with weather-compensated regulation.

Installing the mixing unit for the system of "warm floor": manual

price of water warm floor

The Process of joining a header to alternate the breakdown is as follows:

  • First, you need to determine the location of the collector rack and prepare the installation point.
  • After that you should connect the reservoir to the discharge pipe and “return”, providing them with control valves, automated actuators and fuses.
  • Next you need to connect the taps heating circuit to the taps pipe tee.
  • And finally – configure the node for mixing by calibration to the control system, bleed air and other start-up operations.

Of Course, each of the above stages has many nuances, therefore it is necessary to consider in more detail the specified sequence.

A place in the wardrobe

warm floor

The location of the wardrobe is negotiated already when you design the system “warm floor" as every contour is made from a single piece of polymer pipe, the length of which does not exceed 120 metres. The difference in length between the circuits can not be more than 100-150 cm is Therefore the location of the point at which the installed mixing unit for floor heating is based on the schemainstallation sporulating contours.

Joining of pipes-tees

diagram of the mixing unit floor heating

Mixing unit for Underfloor heating connected according to the following pattern:

  1. To the discharge pipe with heated up to +40-55 °is connected With the coolant shut-off valve, it is mounted tee, a direct channel which is equipped with an automatic temperature limiter or ball cock with socket for temperature.
  2. On the back line, which leaves chilled coolant, also set valves, tee and ball cock with socket for temperature.
  3. Upper tee is connected with the lower by-pass, in which is mounted the circulating pump pumping water up to the pressure line.
  4. To the top ball valve connected to the pipe tee with flow meters on the outlets. Her butt choke valve for air vent.
  5. Lower valve connected to the pipe tee with the thermostats on taps. Its the end of the closed valves to bleed air.

Joining contours

Pipe the heating circuits are successively connected to the outlets of the pressure and return pipes, starting from the first edge, etc. Mounting is made by means of press fittings, which ensure reliable sealing even under linear deformations. The collet elements can't guarantee it, but this method allows further disassembly of the pipe.

Configuration of the mixing unit

mixing unit radiant floor heating

This stage is responsible for setting the automated control system, which is based on the synchronous operation of the servo and data read from temperature sensors. Also checked the thermostats, flow meters, ball valves and pressure relief valve.

In the end the system “warm floor" is checked for tightness of connections in the mixing unit. Although this work can be done in the beginning. Because of the tightness of connections depends on how accurate the calibration of the entire control system.

The Cost of warm water sex

floor manual

One common question that worries many clients: “What is the price for warm floor water?” the Cost depends not only on any brand. In prices affects the material from which made the pipe. The installation of the system also affects the cost.

The Decisive criteria, which determine the price of a warm floor water, are the number of rooms in which work will be carried out, the number of storeys and, of course, the heating circuit. In Moscow the cost of 1 m2 Water Underfloor heating starts from 1100 rubles (cross-linked polyethylene pipe).

The Advantages of Underfloor heating with mixing unit

The System “warm water floor” has a number of indisputable advantages in comparison with other types of heating.

  • Comfortable. Due to the fact that thermal energy is transferred by radiation, not convection. At the same time heats the room evenly, with no cold corners and bursting with heat batteries.
  • Health due to the absence of dust circulation. The floor surface is dry, no mold, eliminates a breeding ground conducive to the growth of microbes and mites. In the rooms is supported by fresh air and optimal humidity levels.
  • Hygiene. Due to the fact that warm floors are easy to clean and disinfect, they can heat rooms to which there are special requirements regarding cleanliness.
  • Security. In the first place it concerns children: warm floors eliminate the appearance of burns and scratches, i.e. everything that can happen in contact with the convector or radiator.
  • Convenience. The system “warm floor" allows you to easily plan the placement of furniture in the room due to the absence of heating.
  • Efficiency. Underfloor heating can save up to 30% of energy in residential buildings, up to 50% in buildings with high ceilings.
  • Contemporaneity. This system is combined with the latest heating equipment, the production of which apply advanced energy-saving technology.


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Alin Trodden - author of the article, editor
"Hi, I'm Alin Trodden. I write texts, read books, and look for impressions. And I'm not bad at telling you about it. I am always happy to participate in interesting projects."

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