Thermostatic valves, how they work

Thermostatic valves, how they work

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Thermostatic valves, how they work: info on the operation and correct use of the thermostatic radiator valves. What to do if they don't work and in case of problems.

Thermostatic valves, how do they work?Thanks to these devices it is possible to set different temperatures in every single room.

This operation may lead newbies to think that thethermostatic radiator valvesare causingproblemsto the entire system, but in reality thethermostatic valveit adjusts the inflow of hot water to the radiator in order to produce heat constantly without exceeding a certain threshold preset on the valve itself.

Thermostatic valves, how they work

The principle of operation ofthermostatic radiator valvesaims to keep oneminimum feel-good temperaturethat the inhabitant of the house will set up.

Those who are new to thermostatic valves may have some initial difficulties in identifying the right thermostatic valve setting for each radiator and therefore the minimum comfort temperature. In this article, in addition to see how the thermostatic radiator valves work, we will see how to set them to obtain maximum comfort with minimum expense (minimum energy consumption).

Inside the knob (thermostatic valve) there is an elementthermosensitivewhich expands as the detected room temperature increases.

With theregulation of the thermostatic valveyou will adjust the desired room temperature, which in technical terms corresponds to the distance between the shutter and the valve. The variation in the ambient temperature will cause the thermosensitive element to expand or shrink, allowing or hindering the flow of hot water that penetrates the radiators from the boiler.

In other words, thethermostatic valvesregulate thepowerof each individual radiator in order to keep the temperature of a room constant.

How to use thermostatic valves

Some quick and easy rules to make the best use of thermostatic valves. You will find all the instructions in the articleHow to use thermostatic valves.

  • - When you leave the house, leave the radiators on with the thermostatic valves only partially closed.
    Practical example: when you leave the house, set the thermostatic valves to value 2 which generally corresponds to 16 ° C. When you return, set the valve to value 3 (generally it corresponds to 20 ° C).
  • - With the arrival of spring and high temperatures, turn off the heating systems leaving the thermostatic valves open to maximum.
  • - Partially close the thermostatic valves in empty rooms to save on heating where not needed.
  • - Keep the radiators on with the thermostatic valves active at least 16 hours a day.

Problems and thermostatic valves not working

Thethermostatic valvesthey are able to supply the right amount of heat in a constant way, for this reason you can notice that the radiator is hot only in the lower part or only in the upper part, or that it does not distribute heat evenly. This does not mean that the radiator is broken or that they are thereproblemsrelated tothermostatic valves not working, this is completely normal and simply means that the radiators have reached the optimal temperature and therefore the heat is only partially supplied to guarantee its maintenance.

Thermostatic valves, most common problems

To increase the accuracy ofthermostatic valvesradiators should not be installed in niches near doors and should not have radiator covers.

In these cases, the temperatures perceived by the thermosensitive element are distorted and therefore the radiator could deliver heat with less intensity than it should. This is because in a closed environment such as a niche, the temperature perceived by the valve is higher than the real temperature. On the contrary, near a door, the temperature detected by the valve is conditioned by the external temperature.

Even an inconsistent functioning of thethermostatic valvesit could cause problems. Heating times of less than 16 hours a day could undermine the accuracy of thethermostatic valve.


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