RHE1154 Features: * Natural gas-fired commercial water heater * Tank capacity: 100 Gallons * Temperature: 185 degree * Full port and flow brass drain valve * 95 percent thermal efficiency reduces operating costs * Spiderfire sealed-combustion * No chimney required * Power or direct vent using plastic pipe * Low NOx emissions * Corrosion resistant * High efficiency 3-pass heat exchanger * Self-diagnostic LCD electronic control direct spark ignition * Zero clearance to all combustible surfaces * Front and back water connections * ASME certified * High altitude compliant * SCAQMD rule 1146.2 certified * AGA certified * Energy efficient Includes: * Includes temperature and pressure relief valve Specifications: * Output power: 250,000 BTU/hr Dimensions: * Overall dimensions: 78.75"" H x 26.25"" W x 26.25"" D Collection: * Professional collection Warranty: * Manufacturer provides three years tank and one year parts warranty