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Ok, the boiler is gas, Vaillant ecoTEC plus 418, VU GB 186/2-0 I think I've provided all the other info stipulated in the "before you ask a question" post ... this is my very first post, so please be kind! Thanks.

Hi all, I have a mysterious noise in my house! In February of 2007 I completely renovated my house (new boiler, new lights, repaint, add more radiators, the works). I also removed all the rads and had the boiler replaced. Once I had re-installed all the rads (after the boiler had...