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Sorry, misunderstood about the flame. The noise does subside as things warm up - if we put the CH on then it's only noisy the first time the boiler fires unless there is a long time between subsequent fire-ups. System pressure is on the green part of the gauge marked as number 1 when cold...

The noise builds up quite quickly a few seconds after the flame ignites and dies down almost instantly as the flame goes out. The flame is blue at all times. I'll give a quailified 'yes' to the Meshersmitt sound - assuming the sound effect guys in the movies got it right. I wasn't around to...

Alpha 240E combi boiler. When starts up (HW or CH) I get an amazing noise that sounds like a cross between a jet engine and a really bad trombone player. There is excessive vibration of the boiler itself and the pipes. The longer the boiler remains fired up the more the noise subsides and...