Originally Posted by
kangaroogod
The short answer is that a full combustion analysis should be performed and the burner should be tuned for maximum efficiency within safe levels. If the contractor did as you said then I would use another. The one that was there is either not qualified or does not care for YOUR well being. I would find one that meets both criteria.
I would guess you have a company that merely changes the nozzle/oil filter and does a quickie on the flue ways.
A professional that cares for you as a customer will change the oil filter, nozzle, strainer (secondary filter) inside the pump, dismantle the unit and thoroughly brush the flue passages, remove the vent pipe and clean, check the chimney condition, check the oil pressure, confirm the proper nozzle is installed, check and adjust your draft through the boiler, adjust the oil/air ratio with digital instrumentation while also measuring carbon monoxide. This would take 1.5-2.5 hours or more. This would be an absolute minimum that needs to be performed in addition to all other water end checks of the boiler.... Good luck in your contractor search