that's soot you're getting, means the flame isn't clean.
It needs a service.
Surely, to increase the oil pressure, ie. increasing the through-put of the nozzle increases oil flow, increases the available push/pressure in the combustion chamber and provides increased atomization of the fuel.
IMHO, this is all a cause and effect of the rear flue on said boiler, causing pressurization of the combustion chamber, coupled with the added resistance of the secondary heat exchanger to be overcome, if recycling at the terminal was the direct cause, surely this would be seen on the FGA as a rise on CO levels, and the existing fule in use is not dissimilar to competitors boilers (grant, warmflow, etc) which do not suffer the same issues
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