Oil-Fired Boiler; Type Hot Water; Applicable Standard ASME H, ETL (Canada and US), AHRI, OMA; Supply Connection 1-1/2" Threaded; Return Connection 1-1/4" Threaded; DOE Heating Capacity 141 to 158 MBH; Net IBR Rating 122 to 137 MBH; AFUE Rating 86 to 86.7 Percent; Firing Rate 1.15 to 1.3 GPH; Boiler Dimensions 22-1/8" Length x 32-7/8" Width x 35" Height; Boiler Material Cast Iron; Water Content 14.75 Gallon; Burner Type Beckett; Venting Type Direct; Vent Size 4"; Mounting Type Floor Mount; Relief Valve Details Supplied; Pressure Rating 30 PSI; Warranty Lifetime Limited; Inclusions/Features Burner, Circulator, Steel Push Nipple, Deluxe Powder Coated Steel Jacket; Application Residential