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I have a Burnham v74 boiler rated at 135000 MBH and a Beckett AFG burner. I believe the unit is oversized for my house. Heat loss calculations give me a loss of appx 40,000/hr; at this time I have a tankless coil in the boiler for domestic hot water, which I believe would add about 50,000 btu/hr.
Is it possible to reduce the burner nozzle size if the unit is indeed oversized and is there any rule of thumb, or sizing charts that address this?

Oil burner nozzles can be sized by dividing the BTUH of the burner by 140,000 if you are burning #2 fuel oil. Divide by about 135,000 if you are using kersoene. Example – 70,000 BTUH burner divided by 140,000 would equal a .50 nozzle. Make sure the spray pattern and the angle of spray are correct for the burner/combustion chamber design as well.

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