9.38 GPM Condensing Residential Natural Gas Tankless Water Heater

Endless Hot Water. Lower Energy Bills. Smarter Comfort.

The ThermoMate RTC68iN Condensing Tankless Water Heater delivers powerful whole-house performance with industry-leading 0.91 UEF efficiency. Designed for North American homes, this high-output 163,000 BTU natural gas unit provides continuous, on-demand hot water while reducing annual energy costs.

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High Efficiency 0.91 UEF – Save More Every Year

With advanced dual heat exchanger technology, this condensing system captures and reuses exhaust heat that traditional tank heaters waste.

• Stainless steel condensing heat exchanger
• Oxygen-free copper primary heat exchanger
• Up to 17% energy savings vs. standard models
• Lower gas consumption and reduced carbon footprint

More efficiency. More savings. Greener home.

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True Whole-House Performance – Up to 9.38 GPM

Built for busy households.

• Supports up to 3 simultaneous showers
• 2 GPM per shower at 105°F (62°F inlet temp)
• Up to 9.38 GPM in warmer climates (77°F+ inlet temp)
• Runs showers, washing machines, and kitchen fixtures at the same time

No storage tank. No waiting. No cold water interruptions.

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Stable Temperature – No Fluctuations

Featuring an intelligent water mixing valve system, RTC68iN:

• Maintains consistent outlet temperature
• Eliminates hot-cold fluctuations
• Automatically adjusts flow during multi-fixture use
• Delivers smooth and precise heating performance

Perfect for families who demand reliable comfort.

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CSA Certified Safety – Built for North America

This CSA-certified natural gas unit includes 8 built-in protections:

• Flame-out protection
• Boil-dry protection
• Freeze protection (auto activates at 41°F)
• Overheating protection
• Over-temperature lock
• Pipe blockage protection
• Excess air pressure protection
• High-temperature safety control

Sealed combustion design improves efficiency while significantly reducing operating noise.

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PVC Venting Compatible – Lower Installation Cost

Unlike traditional tankless units requiring expensive stainless steel venting (300°F+ exhaust), this condensing system reduces exhaust temperature to:

158–194°F (70–90°C)

• Compatible with standard PVC venting
  
• Lower material costs
  
• Easier basement or closet installation
  
• Ideal for retrofit projects

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Condensate Management

As a condensing unit, RTC68iN produces mildly acidic condensate water.

• Requires drainage connection
• External condensate neutralizer kit recommended (sold separately)
• Protects plumbing system from corrosion