Hello, I wondered if you could help, can the expansion vessel on an isar 30100 be re-pressurised , my local boiler company says not, the only boiler in the world apparently, my boiler makes noises, sometimes loud bangs, this is at the time the pressure randomly increases from about 2 bar to 3 bar. They said they need to put more air in the expansion vessel, but there is no way to do it and I should get a new boiler. bearing in mind the bolier is 4 years old. I have tried ringing ideal, but cant get through to anyone. Can you tell me how to do it, if they need any special tools etc.. Many Thanks