The ProLine® Mobile Home models secure air from inside the home (standard vent) or from outside the home (direct vent). This model is convertible for use with either natural gas or LP (propane). Featuring a 30 gal (nominal) tank and a 30000 Btu gas burner, the GS6-30-MDV Direct Vent delivers a first hour rating of 60 gal and a recovery rate of 31 gph. With an 0.61 Uniform Energy Factor, this water heater is not Energy Star® qualified. It carries a 6-year limited tank warranty and meets Low NOx emission requirements.