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thanks to everyone for their input, especially Joe60. i especially found the technical explanations useful and interesting to follow. i have arranged with the RGI plumber for him to install a new fan. he says it's not a big job, no more than two hours. sorry for not supplying more boiler...

I don't think it is an ecotec. We got it just before / as the condensing option was available. Also, I think the plumber is a vaillant certified plumber but I just wanted to understand and feel a tad more eductated in getting to grips with my boiler/ch system. Thanks everyone. I'm listening!!!

Oh my. I am following this with great interest - being one of those people who likes to UNDERSTAND THINGS. Anyway, this is what I am getting: it is probably the fan but if that does not work (it's a two hour job apparently) then it could be the heat exchanger. My, it's chatty here....

Thanks for reply. So this would happen just with hot water and not with central heating?

still hoping for ideas please..... sounds too scary to take showers here! thanks.

I have a Vaillant combination boiler about ten years old. Since having an expansion vessel fitted recently, the boiler makes a noise like a plane going over when the hot water is running. The noise starts soon after the hot water is running and goes down in tone lasting up to thirty seconds...