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How to crimp the radiator?


The thermostat on the radiator allows you to regulate the temperature in a very simple way. The thermostat adjusts the heating force to the current settings and room conditions detected by the sensor. However the flow of water is sometimes incorrect. In that case it is recommended to carry out the so-called crimping of radiators, i.e. their preliminary adjustment. Find out how to do it.

What is the crimping of radiators?

The way radiators work depends on the flow of water in the installation. Water, as you know, usually flows where it meets the least resistance. If the radiators are not properly adjusted, this may cause hydraulic imbalance. As a result, some radiators will receive too much hot water and others too little. This, in turn, causes too low or too high room temperature. Then you need to carry out a process called crimping of radiators or, simply, their pre-adjustment.

Crimping is standardizing the flow of water in radiators at different distances from the heat source. Thermostatic valves used today can be adjusted quite easily – you just need to know how to do it. This is not only a matter of thermal comfort but also the cost of heating. Properly adjusted thermostatics radiator valve can help reduce energy consumption by up to 20%.

How to crimp the radiator?

In practice, the crimping of the radiator consists in adjusting settings of the thermostatics valve. The idea is to suppress the flow of water where it is too large and increase its intensity where the water does not reach enough. The head from the valve should be removed and the position of the adjustable ring visible after removal should be adapted. You need to lift it up (pull) and position it in relation to the dot or other mark on the valve body – this is the reference point.

Usually there is a letter N and a scale with numbers from 1 to 7 on the ring. 'N’ means the full flow of water, while the numbers 1 to 7 are used to limit the flow (7 is the maximum flow limit). If the radiator is currently overheating, it is necessary to increase the number indicated by the ring, thereby reducing the flow. If it does not heat up enough, increase the flow by choosing a lower number or the letter N.

Crimping of radiators – which setting?

Radiators crimping specialists use tools to measure water flow. However, amateurs must rely on trial and error. In case of incorrect operation of heating, usually you need to begin with reducing the flow of water in the warmest radiators. After a while, you can check how this affected the heating. Usually it takes at least a few attempts to achieve the desired effect. After finishing the work, you can re-install the thermostatic valve and enjoy the new settings.

Modern thermostatics radiator valve 

Crimping of the radiators can be very helpful if the temperature distribution in the heating system is unequal. Thanks to that process, you can much more accurately manage the work of the radiators. However, currently, we are moving away from manual adjustment. Automatic and smart systems are being used more and more often.

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