The Pueblo B-Vent line opens with a 15,000 BTU single burner model featuring ceramic fiber split oak logset, with 4" venting. The step-up (P325) model jumps to 25,000 BTU with U tube dual burner and logset, with 4" venting. The step-up (P325) model jumps to 25,000 BTU with U tube dual burner and full glowing ember pan. This model features a premium multidimensional refractory gas log set and uses 5" B-Vent pipe. All Pueblos ship smooth faced and set up for natural gas, but are easily convertable to propane.