About This Product With built-in recirculation, this Rheem Performance Platinum 11 GPM Super High Efficiency Indoor Natural Gas Tankless Water Heater gets hot water to the tap instantly and keeps going as long as you need it. It's perfect for replacing your existing water heater and compatible with most homes. Its energy-efficient operation leads to big energy costs savings. Plus, it saves water, time, space and money on installation related costs. It may even qualify for rebates in your area for added savings. Rheem Tankless Hot Water Heaters are preferred by contractors and designed to get your home enjoying the comfort and convenience of continuous hot water with minimal installation costs. PLEASE NOTE: This model is compatible with Schedule 40 PVC venting. Highlights Instant comfort: continuous flow of hot water you expect from a Rheem tankless water heater, without the wait thanks to recirculation technology which keeps hot water ready to go, the 11 GPM model provides enough hot water to supply up to 4 bathrooms at the same time (at a 35 temperature rise) Perfect for replacement: Compatible with more homes, existing plumbing, longer venting capability and 1/2 in. gas line making it easier to replace a traditional tank Saves on energy costs: Tankless water heaters heat water when you need it which saves on energy costs from day 1 and combined with condensing technology, leads to estimated energy cost savings of more than $1,100 over 12 years Saves on installation costs with included components: Included Service Valves ease maintenance procedures and included Crossover Valve eliminates extensive plumbing changes Saves on installation costs with venting compatibility: Low-cost PVC venting helps keep installation costs to a minimum Saves water: recirculating design cuts water waste saving up to 12,000 Gal. of water per year Saves space: small, wall-mount design frees up valuable floor space within your home and built-in recirculation eliminates bulky under sink components This product may qualify for rebates or other incentives. Look below the product price to see if any apply to your purchase based on your location Added peace of mind: water and gas leak detection for added protection Warranty: 12-year limited warranty on heat exchanger, 5-year limited warranty on parts and 1-year in-home labor warranty Dimensions Product Depth (in.) 14.8 in Product Height (in.) 28.7 in Product Width (in.) 17.3 in Vent diameter (in.) 3 in Water Connection Size (in.) 3/4 in Details Application Type Residential BTU Rating 199000 Efficiency Level Super High Finish Family Gray First Hour of Delivery (gallons/hr) 660 Flow Rate @ 35F Rise (gallons/min) 11 gal (US)/min Flow Rate @ 45 Rise (gallons/min) 8.5 gal (US)/min Flow Rate @ 55 Rise (gallons/min) 7 gal (US)/min Flow Rate @ 65 Rise (gallons/min) 5.9 gal (US)/min Gas Connection Size 3/4 in Gas Type Natural Gas Heat Exchanger Warranty 12 Year Indoor/Outdoor Indoor Maximum Flow Rate (gallons per minute) 11 Maximum Temperature (F) 140 F Minimum Activation Rate (gpm) 0.5 Minimum Temperature (F) 100 F Number of Showers 2-4 Pack Size (description exceeds maximum possible length)