The ProLine® Series gas water heater is designed to deliver an economical performance that can lower your energy bills and also provide long-lasting value. Featuring a 40 gal (nominal) tank and a 40000 Btu gas burner, the GS6-40-BCS Atmospheric Vent delivers a first hour rating of 81 gal and a recovery rate of 41 gph. With an 0.59 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.