Conventional Gas Boiler; Type Hot Water; Supply Connection 1-1/4 Inch Threaded; Return Connection 1-1/4 Inch Threaded; Gas Type Natural; AGA Input Rating 133000 BTU/Hour; DOE Heating Capacity 112000 BTU/Hour; Net IBR Rating 97000 BTU/Hour; AFUE Rating 85 Percent; Boiler Dimensions 21-1/2 Inch Width x 20-3/8 Inch Depth x 34-3/8 Inch Height; Boiler Material Cast Iron; Ignition Type Electronic Intermittent; Burner Type Stainless Steel; Venting Type Direct; Vent Size 6 Inch; Pressure Rating 58 PSI; Mounting Type Floor Mount; Warranty Lifetime Limited; Inclusions/Features Flame Roll-Out Switch, Flame Roll-Out Switch Cable, Gas Valve, Gas Supply Pipe, Boiler Temperature Controller, Ignition Module, Igniter Cable, Gas Valve Cable Connector, Pilot Line; Applicable Standard ASME H, AHRI, CSA (Canada and US), CRN; Electrical Rating 120 Volt; Application ResidentialThe Buderus GC144 boiler is a compact, easy to install boiler with all the features and benefits Buderus customers have come to expect. NEW! Efficiency ratings of 85% on all models! Stainless Steel Corrosion Resistant Premix Burners GL-180M Flexible Cast Iron Electronic Ignition Side Piping Design for Convenient Boiler Retrofit Installation 3 Models with Inputs from 74,000 to 132,500 BTU/Hr