Hi,
I had a Worcester Bosch 24i Junior combination installed a couple of months ago and when I turn on the hot tap it makes a slight bang which sounds like a combustion noise. Is this normal as I have listened to a few other boilers and they do not seem to make this nose?

Dean, January 2014

when the gas 1st lights they do make a bump noise as it explodes.I suspect it is OK but if worried and under warranty call them out

A1, January 2014