we had this radiator installed recently.
it started making noises. called the plumber, he said he doesnt know what it is. he records it and says it sounds like a water hammer, but he hasnt heard such a sound ever before, he would show it his peers and come back. weeks pass, i dont hear from him. i call him, he says he has the parts and comes around the same day!? dude.
anyway, he says its a water hammer and installs a little tank, explaining its like a diaphragm. sure whatever, if it solved the issue, fine. while he was there we ran the water of course and it didnt happen. but then it started again the same evening.
but it doesnt. whenever i turn on warm water on the taps, the sound comes. sometimes very quickly within 5 or so seconds, sometimes it doesnt happen at all. sometimes it takes 15 seconds. sometimes it lasts as long as warm water it running, sometimes it goes away after a short time while warm water is running.
here links to two videos, one from the inside, one from outside:
what the hell is that? its just annoying and extremely loud, especially from the outside, that i'm sure every single neighbor can hear it.
i aired the radiators, i tried the "vent system" feature of the boiler, i tried raising and lowering the water temperature... i dont know what else to do. is it a defective unit maybe?
the plumber doesnt look like he wants to solve the issue. takes him weeks to come around with me having to call him like i have nothing better to so. texted him last week, he said he is on holiday and may be back by the end of the week.
i wouldnt even know how to explain the noise. its certainly not whistling, or is it?