The ProLine® standard electric water heater is a reliable 40 gal water heater choice when you are looking to maximize your hot water output and is designed with environmentally-friendly insulation to reduce standby heat loss. With a 30 gal (nominal) tank producing 6000 W, the EN6-30-DOBS delivers a first hour rating of 43 gal a Uniform Energy Factor of 0.9 and a recovery rate of 21 gph with an 0.95 Energy Factor, this water heater is not ENERGY STAR® qualified. It carries a 6-year limited tank warranty.