Sean wrote:
If i slightly move the case panels the "tone" changes and its the same
if i slightly push the angled vent directly on top of the boiler -
thats what gives me the impression of it being a resonation noise -
even without the panels on it's still the same.

Just not sure how to reduce or prevent the noise.


I don't have the rattle, but the Bosch hum is very high pitched compared
to other boilers I've lived with. It also throws the exhaust fumes a
good deal further so I suppose the two are connected.