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DPFO Water Series Boiler ,   Model: DPFO Additional Information With efficiency as high as 87.6%, Ultimate''s oil-fired DPFO Series water boiler combines versatility, efficiency and design to make it the ideal choice for heating comfort and reliability. Efficiency: Energy Star Rated Capacity: Without Tankless Coil: Min. 56 - 74 - 93 - 130 - 167 MBH. With Tankless Coil: Min. 62 - 80 - 99 - 117 - 154 MBH. Note:Inputs shown reflect minimums for Energy Star Rated efficiencies. See brochure for input detail(maximums)on mid-efficiency capacities. Heat Exchanger: Cast Iron Combustion: Atmospheric Venting: Direct Vent or Vertical Vent Boiler Type: Hot Water Brochure 240004871 - Ultimate DPFO Rev. 8/08 460.8 kb Installation & Operation Manual 14683825 - DPFO Rev. 2.1 2.9 MB Service Bulletin PFO Vent Termination Change Bulletin 12/06 198 kb Venting Addendum 240005665 - DPFO Venting Rev. 1.2 899.7 kb