What can make a radiator bounce?

In summer we replaced the radiators and the heating system. One of the radiators bounces loudly when it warms up, and it’s very annoying to get up in the morning. What could be the reason for this and what can be done about it. It is certain that the system is not airy because the radiator is evenly warm everywhere.   
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1 Answer

Answer :

That was the problem for us, and they said everything. The system is airy, thermal expansion, but I didn't find the solution anywhere. It is true to say that it bounces due to thermal expansion, but what is the solution? The cause of the bounce is the contact between the radiator brackets and the metal part of the radiator. This usually happens when the small plastic spacer breaks or is not put in place. It is then advisable to place a thin piece of rubber or a thicker strip of edging tape between the metal part of the radiator and the "hook" holding the radiator. Usually this can be done without any problems because the radiator can be raised enough to do this. [img alt_text = 'radiator bounces' description = ''] https:///file/2018/01/radiator-pattog.jpg [/ img]       
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