when my new boiler has been on for 4 hours or more it makes a loud rumbling noise. It is a potterton promax sl

sarah, January 2010

if you are not happy recall the installer and keep recalling till you are HAPPY .
the boiler comes with a 12 /24month guarantee depends on make
the installer should be at least able to guarantee his work, and be able to put your mind at ease regarding the noise.

new systems can and do have niggling teething problems

wirecutterman, January 2010