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Performance Platinum 8.4 GPM Natural Gas High Efficiency Outdoor Tankless Water Heater

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  • Energy saving: only heats water on demand
  • Longer PVC venting: 150 ft. with 3 in. and 60 ft. with 2 in.
  • Continuous hot water for 1-3 showers at once; see Sizing Guide
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Product Overview

This Rheem Performance Platinum High Efficiency Tankless Water Heater provides estimated energy cost savings of more than $1,100 over 12 years. Its ENERGY STAR Certified and with a 0.93 UEF, qualifies for many rebates and incentives. Plus, our exclusive Water Savings Setting can save 1,100 Gal. of water per year. Rheem Tankless 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.
  • Click here for our Sizing Guide to ensure you choose the right Rheem tankless model for your region and usage
  • Continuous hot water: Rheem performance platinum tankless water heaters when you need it, for as long as you need it and the 8.4 GPM model can provide enough hot water to supply 1-2 bathrooms at the same time (at a 35 temperature rise)
  • Saves water: save up to 1,100 Gal. of water per year with our exclusive water savings setting
  • Saves energy costs: tankless water heaters heat water only when you need it which saves on energy costs from day one and combined with Rheem condensing technology, this leads to estimated energy cost savings more than $1,100 over 12 years
  • Additional savings: this product qualifies for rebates through many utility companies and state/local governments look below the product price to see if any apply to your purchase based on your location
  • Frees up space: installs outside for easy replacement of your existing outdoor unit
  • Perfect for replacement: compatible with standard gas line making it easier to replace a traditional tank
  • Saves on installation costs: included components, like the built-in condensate neutralizer, help to keep installation costs to a minimum
  • Easy to own: our maintenance notice setting alerts you with a flashing warning code when it is time to call for a regular service check and our hard water build-up indicator automatically displays a service alert if scale build-up is detected
  • Warranty: 12-year limited warranty on heat exchanger, 5-year limited warranty on parts and 1-year in-home labor warranty
  • Recirculation pump kit ready: quickly pairs with our tankless recirculation pump kit-timer based (model # RH17920) and hot water recirculating pump with under sink kit (model # RH18537) to provide faster hot water at the tap to reduce water waste and save up to 12,000 Gal. per year
  • EcoNet enabled: this product can connect to the EcoNet mobile app via the tankless econet accessory kit (model # REWRA630TWH) sold separately
  • Reliable hot water solution from Rheem, the global leader in water heating
  • Call 1-855-400-2552 before noon for same-day installation service in most areas, or visit our Water Heater Installation page for more information.
  • Click here to learn more about Eco Options and Energy Efficiency
  • Click here for more information on Electronic Recycling Programs
  • California residents

Info & Guides

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NamePerformance Plus 8.4 GPM Natural Gas Outdoor Tankless Water HeaterPerformance Platinum 8.4 GPM Natural Gas High Efficiency Outdoor Tankless Water HeaterPerformance Platinum 8.4 GPM Natural Gas High Efficiency Indoor Tankless Water HeaterPerformance Platinum 9.0 GPM Natural Gas High Efficiency Outdoor Tankless Water Heater
Gas TypeNatural GasNatural GasNatural GasNatural Gas
Number of Showers1-31-31-32-4
Application TypeResidentialResidentialResidentialResidential
Flow Rate @ 45°F Rise (gallons/min)
Efficiency LevelHighSuper HighSuper HighSuper High
Water Heater FeaturesUltra LoNoxUltra LoNoxUltra LoNox,Wall MountedUltra LoNox
Fuel TypeGasGasGasGas
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Product Depth (in.)
Product Height (in.)
Product Width (in.)
Vent diameter (in.)
Water Connection Size (in.)


Application Type
BTU Rating
Efficiency Level
Super High
Finish Family
Flow Rate @ 35°F Rise (gallons/min)
8.4 gal (US)/min
Flow Rate @ 45°F Rise (gallons/min)
Flow Rate @ 55°F Rise (gallons/min)
Flow Rate @ 65°F Rise (gallons/min)
Fuel Type
Gas Connection Size
Gas Type
Natural Gas
Heat Exchanger Warranty
12 Year
Maximum Temperature (F)
Minimum Activation Rate (gpm)
Minimum Temperature (F)
Number of Showers
Pack Size
Product Weight (lb.)
Required Volt Connection
120 volt
Total BTU
157000 Btu
Uniform Energy Factor
Vent Type
Single Wall
Water Heater Features
Ultra LoNox
Wattage (watts)

Warranty / Certifications

Certifications and Listings
CSA Listed,UL Listed
Labor Warranty
1 Year
Part Warranty
5 Year

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