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Residential Condensing Boiler; Type Hot Water; Supply Connection 1 Inch Male Threaded; Return Connection 1 Inch Male Threaded; Gas Type Natural/Propane; Gas Connection 3/4 Inch Threaded; AGA Input Rating 160364 BTU/Hour; Net IBR Rating 129 MBH; AFUE Rating 96 Percent; Air Inlet Connection 2 Inch; Boiler Dimensions 20 Inch Length x 47-1/2 Inch Width x 15-3/8 Inch Height; Boiler Material Stainless Steel; Water Content 1.21 Gallon; Venting Type Direct; Vent Size 2 Inch; Relief Valve Details 30 PSI Pressure Relief Valve Installed; Pressure Rating 80 PSI; Mounting Type Floor Mount; Warranty 5 Year (Parts and Labor), Lifetime Limited (Heat Exchanger); Options Adapter; Inclusions/Features Integral Pump, Built-In Low Water Cut-Off, Adjustable Manual Reset High Limit, Push-Terminal Wiring and a Host of Venting Option; Applicable Standard ASME H, AHRI, CSA (Canada and US); Electrical Rating 120 Volt AC 60 Hertz 1-Phase 3.4 Amp Full Load; Turndown Ratio 5:1; Noise Rating 49 Decibel; Maximum Operating Temperature 194 Deg F; Water Connection 1 InchThe Buderus SSB residential boilers were designed with the same high-quality components found in our commercial SSB boilers, but in a compact space-saving design. All SSB boilers include integral pumps, built-in low water cut-offs, adjustable manual reset high limits, push-terminal wiring and a host of venting options. In addition, the Buderus SSB residential boilers have the best price-performance and warranty in the market. The 316L stainless steel heat exchanger, is a water-tube design that has no welds on the water side of the heat exchanger. This feature, combined with a 5:1 turndown pre-mix burner, allows the SSB boilers to achieve an AFUE rating of 96%. Other standard features include outdoor reset, domestic hot water priority, top connections which allow for an easy installation, limited clearance requirements, internal cascade sequencer for up to 8 boilers for increased output and application design, and CSD-1 components pre-installed.