Hi my old boiler which was a glow worm combi was banging on start up and then started exploding on start up then it broke down....so i got a new boiler after all the problems with that one..I had fitted a maine boiler which was niceand quiet at first but this too has now started banging when it fires up...the plumber thought that it was because my kitchen tap was not running through quick enough and causing a build up of gas then exploding....but it does this randomly as my boiler fires up even when there is nothing on...supposed to i think!!!! but even then if fires up with a bang.....why would this be doing this again as itis a completely different boiler??????help me...driving me mad!!!!!!!