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A manifold, a pump, a three-way valve - these are the concepts that are ingrained into our heads as soon as we hear the phrase "water floor heating".
Indeed, all these components are a familiar unit that works on the principle of mixing flows.
Mostly, this option is laid down immediately in the project and installation is carried out together with the radiator system heating, since with a separate installation - it is required to free up space on the wall and partially redo the existing system.
And, very few people know that underfloor heating is done not only through this method.
There is a simpler option that pays off 100%. It is called - backflow restriction. Thus, we have a second system, which does not require a mixing unit and does not require a separate pump, but we will definitely be able to regulate the temperature.
I will say that even the world leaders in components for heating systems Oventrop, Herz, Danfoss they present this system in their catalogs, and this confirms that the system is 100% in place and works in millions of homes. These manufacturer names are more than enough to make the system noteworthy!
So, circuit with temperature control by limiting the return temperature - cuts directly into the existing system heating, like any radiator, more precisely - to any place of the supply and return line: in the bedroom, bathroom, corridor, kitchen, boiler room and etc.
Schematically, it looks like this:
But, the question arises of how to regulate the temperature so that you can be on the floor differently than "already in the pan"? For this, there is a coolant control valve, which measures its temperature and opens when it falls below the set value. The name of this crane RTL valve.
This valve is two-way and throttles the flow rate of the coolant:
How it works (by example)
Let the return flow control valve be set at 28 ° C. The heat carrier with a temperature of 60 ° C filled the underfloor heating circuit and the valve closed.
Now, the sensor waits until the coolant temperature drops to 28 ° C. As soon as this happens, the valve opens slightly, launching the next portion of the coolant into the circuit and again blocks the flow.
A very primitive but effective scheme. True, there is one "BUT" - the recommended length of one circuit is up to 50 m (12 sq.m.), otherwise a large hydraulic resistance is created and the coolant is easier to pass by the circuit along the return line. Therefore, craftsmen divide long sections into two short ones.
From the author
Of course, it is possible to carry out the underfloor heating system only on RTL valves, collecting them together, or you can connect one valve to a common manifold, as in the illustration (photo on the right):
But, most often, for ease of adjustment, such a valve is installed in each room as a separate element or as a factory built-in unit into the wall - Unibox.
The cost of quality products starts from 3,500 rubles, for branded goods you can pay 10,000 rubles / piece, this is not a shortage and the market offers options for any wallet:
In fact, the return flow temperature control system copes with the function assigned to it very effectively. It becomes simply irreplaceable when you need to make the floor warm in a separate room.
Therefore, if one, two or three rooms need it, I highly recommend setting RTL. The costs only for a piece of pipe and a valve, which will come out at a maximum of 4-5 tr, and mixing units in this case are completely inappropriate!
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