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    Nozzle size

    Scotth48
    Scotth48 Member Posts: 2
    in Oil Heating
    Replacing my oil fired boiler with the same 4 section unit but a different brand. My house is about 1300 sq ft on each floor for a total of 2600. My old boiler came with a 1.25 nozzle and we used a 1.0 nozzle without any problems. 
    The new burner uses a 1.5 nozzle for a 200,000btu rating. 
    Can I go smaller on the nozzle size that would be more in line with the old boiler? 1.0-1.25 gallon.

    Thanks.

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    Comments

    • bburd
      bburd Member Posts: 1,149
      edited December 2023
      Your new boiler is too big. How was it sized? If the house did fine burning 1 gallon per hour you don't need a boiler that can burn 1.5 unless you are planning a very large addition.

      Steam boilers are sized by measuring the radiators. Hot water boilers are sized by calculating building heat loss.
      —
      Bburd
      HVACNUT
    • SuperTech
      SuperTech Member Posts: 2,568
      Wow. Are you heating the house with all the windows open? How was the boiler size determined? A 3 section would have been more than enough.

      As far as the nozzle goes, the manufacturer usually specifies a few different firing rates depending on oil pump pressure and nozzle size. But you need to perform a combustion analysis after changing nozzles or else you can't be sure the burner is operating properly or safely.
    • HVACNUT
      HVACNUT Member Posts: 6,684
      2,600 sq ft and approximately 160,000 net BTU, that's about 60 BTU per sq ft which would be excellent if you lived on Pluto.

      Go with the 3 section. 
      What make and model? What burner?
      jesmed1
    • STEVEusaPA
      STEVEusaPA Member Posts: 6,505
      HVACNUT said:

      ...would be excellent if you lived on Pluto...

      I don't know of an additive that would keep the fuel from gelling down to -387°F

      There was an error rendering this rich post.

      HVACNUTCanuckerMikeAmann
    • jesmed1
      jesmed1 Member Posts: 1,232
      Just for comparison, my 4800 sq ft, 100 yr old condo building in the Boston area could be heated by a 1.0 gph input rate with margin to spare.

      As others have said, unless you are somewhere above the Arctic Circle, you have way more capacity than you need.
    • Grallert
      Grallert Member Posts: 941
      This is an extremely oversized boiler which makes me question the installer.

      Miss Hall's School service mechanic, greenhouse manager, teacher, dog walker and designated driver

      SuperTechMikeAmann

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