STOP ! Don't make a rash decision. Got codded myself last year, cos I was non the wiser. I now have a Potterton boiler that still has the guarantee still in date and a plumber that doesn't want to know. Tried taking it up with Pottertons but have still gotten nowhere. BBC Watchdog did a special on Potterton boilers and all the people that are having trouble with them. The result they got was, they were promised that all people who contacted them with problems would be dealt with and they even put a letter on their webpage that you can download and send to Pottertons.
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But since this is UK based, I don't know how I will fare in the long run. So please learn from my stupidity of not doing my homework and take a day or two to decide on you boiler. You may say that's a long time in this weather without heat, but believe me, it's better than every single morning getting up to a freezing cold house and likewise coming in in the evenings because the boiler has re-set itself yet again. And when I say, everyday, I'm not kidding. Am sick to death of it and it's only brand new :mad:
p.s. 2.5k seems to be quite excessive. Would not pay that much