Professional Classic™ Power Vent gas water heaters offer up to 100 foot vent runs, energy efficiency and the Guardian System Efficiency .61 - .69 UEF Performance FHR: 67 - 84 gallons Recovery: 32.4 to 42.4 GPH at a 90° F rise Self-Diagnostic System Electronic gas control for improved monitoring> and service Low Emissions Eco-friendly burner, low NOx design Features Uses indoor air for combustion; blower> exhausts the flue gases Standard 120 VAC electrical connection New whisper quiet blower Guardian System™ & Sensor Exclusive air/fuel shut-off device Maintenance free – no filter to clean Disables the heater in the presence of flammable vapor accumulation Flexible Venting Options Long venting lengths up to 100 equivalent feet PVC, ABS, or CPVC vent pipe options Vertical or horizontal termination Longer Life Rheem exclusive R-Tech (resistored) anode rod> provides long-lasting tank protection High Altitude Compliant Tall models certified for applications up to 7,700 ft. above sea level and short models up to 6,000 feet above sea level Plus… Enhanced-flow brass drain valve Temperature and pressure relief valve included Low lead compliant Durable Silicon Nitride Ignitor (HSI) EverKleen™ patented system fights sediment build-up Standard replacement parts READ LESS Product Info Specifications Dimensions Product Depth (in.) 21.75" Product Height (in.) 51.25" Product Width (in.) 21.75" Details Available In Canada Yes Fuel Type Natural Gas EF 0.67 Primary Warranty 6 Number Of Back To Back Showers 1 Tank Capacity 40FetchDocument.aspx?ID=DDD9B12B-0096-451C-8609-9B2208350353FetchDocument.aspx?ID=AC04F42E-1F9D-4CD4-BE54-5D9B6ED08DD1