Who We Are
Learn more about Rheem, our history and our commitment to sustainability.
Sustainability
Learn about our commitment to doing good by our customers, our partners, our employees - and our planet.
Our Leadership
Find detailed profiles of our company's key executives, highlighting their professional backgrounds, expertise, and roles within the organization.
svg-icon
Residential Products
svg-icon
HomeProductsHomeownersWater HeatersTankless Water HeatersRheem IKONIC® (S Series) Super High Efficiency Condensing Tankless Gas Water Heater

Rheem IKONIC® (S Series) Super High Efficiency Condensing Tankless Gas Water Heater

MODEL CRTGH-S10i
*“Industry-leading" based on Rheem Manufacturing Company's comparison of publicly available warranty programs from leading manufacturers as of Aug 2022. 15-year heat exchanger warranty includes full unit replacement. 5-year parts, 1-year labor. Coverage varies by model. Exclusions apply. Rheem® and IKONIC® are trademarks of Rheem Manufacturing Company.
  • .96 UEF and ENERGY STAR® certified
  • Save up to 36% in energy costs per year
  • Rheem Exclusive! Hot Start Programming eliminates cold water bursts for continuous hot water
  • Rheem Exclusive! Overheat Film Wrap shuts down the system if overheating occurs
  • Industry Best! 1/2" side to side clearance
  • Wi-Fi capable
  • Industry's most comprehensive 15-year heat exchanger warranty
Select GPM
8
GPM
10
GPM
11
GPM

SKU CRTGH-S10i
Warranty Years 15
Model Rheem IKONIC® (S Series) Super High Efficiency Condensing Tankless Gas Water Heater
GPM 10.1
Fuel Natural Gas,Propane Gas
WiFi Connectivity Yes
Depth 13.69"
Height 28.56"
Width 17.31"
UEF
0.96
High Efficiency Yes
Energy Star Rated Yes
LowNox Yes

Easy Installation

  • PVC Vent runs up to 70' (2"), 150' (3")
  •  Easy set up with full text digital display and no dip-switches
  • Field gas convertible from natural gas to LP- conversion kit included
Ready for Retrofits

  •  Allows flex venting through existing B-vent up to 50'
  •  1/2" Gas line compatibility (subject to local code)
  • Approved for installations in ManufacturedHome (Mobile Home) environments
Key Features

  • Stainless steel Primary and Secondary heat exchangers provide increased efficiency and durability
Rheem® Exclusive! 

  • Hot-start programming ensures the unit is in a ready state between back-to-back usage, avoiding any cold water bursts

*“Industry-leading" based on Rheem Manufacturing Company's comparison of publicly available warranty programs from leading manufacturers as of Aug 2022. 15-year heat exchanger warranty includes full unit replacement. 5-year parts, 1-year labor. Coverage varies by model. Exclusions apply. Rheem® and IKONIC® are trademarks of Rheem Manufacturing Company.

AHRICSANSFEnergy Star

More Residential Rheem Products

Find additional documentation by viewing these related products.

Natural Gas
Propane Gas
CRTGH Series Super High Efficiency Condensing Tankless Gas Water Heater with Built-In Wi-Fi
6.6-9.5 GPM
  • .93 UEF Rated
  • Built-in EcoNet® Wi-Fi Technology
  • LeakGuard® Leak Detection and Prevention System
  • Indoor Model Only
Natural Gas
Propane Gas
Rheem IKONIC® (SR Series) Super High Efficiency Condensing Tankless Gas Water Heater with Built-in Recirculation Pump & Wi-Fi
8.4-11.2 GPM
  • .96 UEF and ENERGY STAR® certified
  • Built-in recirculation pump
  • Built-in EcoNet® wi-fi
  • Save up to 36% in energy costs per year
  • Rheem Exclusive! Hot Start Programming eliminates cold water bursts for continuous hot water
  • Rheem Exclusive! Overheat Film Wrap shuts down the system if overheating occurs
  • Industry Best! 1/2" side to side clearance
  • Industry-leading warranty with full unit replacement coverage*
Natural Gas
Propane Gas
Professional Prestige Series: 9.5 GPM Indoor Tankless
9.5-9.5 GPM

  • High Efficiency Tankless with EcoNet® Smart Home Technology
  • Up to .93 UEF - US
  • Up to .96 EF - Canada
  • Built-in Condensate Neutralizer
Natural Gas
Propane Gas
Rheem® ThermaForce® Super High Efficiency Condensing Tankless Gas Water Heaters
10.1-10.1 GPM
  • Up to .90 UEF
  • Save up to 32% annually in energy costs 
  • Only 4 moving parts - Damper, Fan, Gas Valve, Mixing Valve
  • Built-in Illuminated Touchscreen Control Panel