OWB - Oil Fired Water Boiler Series 2

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OWB - Oil Fired Water Boiler Series 2

  • 0.70 to 1.75 GPH Input
  • Factory tested
  • Easy service
  • Swing-away burner door
  • Low draft loss
  • Top access cleanout cover
  • Plug-in wiring harness
  • High efficiency oil burner
  • Flame retention head design
  • Solenoid valve
  • PSC motor
  • Solid state ignitor
  • Rear flue outlet
  • Cast iron sections with built-in air separator
  • Insulated heavy-gauge steel jacket

    • Additional Information

    Efficiency Rating Chart: 
    Boiler Model Burner Input AHRI Certified Ratings Minimum Chimney Size
    (x 15' High)
    Heating Capacity MBH   Net Rating (water) MBH Seasonal Efficiency AFUE%
    GPH MBH
    Rectangle Round
    OWB-3 0.70 98 86 75 86.4 8" x 8" 6"
    OWB-3 0.95 133 114 99 85.0 8" x 8" 6"
    OWB-4 1.00 140 122 106 86.2 8" x 8" 6"
    OWB-4 1.20 168 145 126 85.0 8" x 8" 6"
    OWB-5 1.20 168 147 128 86.1 8" x 8" 7"
    OWB-5 1.45 203 175 152 85.0 8" x 8" 7"
    OWB-6 1.40 196 171 149 86.1 8" x 8" 7"
    OWB-6 1.75 245 212 184 85.0 8" x 8" 7"
                   
    Williamson has determined the boilers listed below are compliant with ENERGY STAR® Program 3.0 when installed with (optional) OVD kit.
    OWB-3-T-S2-D 0.70 98 87 85 87 8" x 8" 6"
    OWB-4-T-S2-D 1.00 140 123 107 87 8" x 8" 6"
    OWB-5-T-S2-D 1.20 168 148 129 87 8" x 8" 7"
    OWB-6-T-S2-D 1.40 196 173 150 87 8" x 8" 7"