The ProLine standard lowboy water heater is the reliable 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 48 gal (nominal) tank producing 6000 W, the EN6-50-DOLBS delivers a first hour rating of 60 gal and a recovery rate of 21 gph. With an 0.93 Uniform ENERGY FACTOR. It carries a 6 years limited tank warranty.