Standard Condensing Ultra-Low NOx 199,000 BTU Natural Gas Tankless Water Heater with X3® Scale Prevention

Model RTM-199X3-N 100
Maximum BTU's

  • ENERGY STAR® Certified with a UEF of 0.95
  • Delivers up to 10.5 GPM maximum flow rate
  • X3® Scale Prevention Technology—Extends the lifespan of the water heater
  • Standard Condensing Ultra-Low NOx 199,000 BTU Natural Gas Tankless Water Heater with X3® Scale Prevention
    Model RTM-199X3-N 100
    Product Details
    • ENERGY STAR® Certified with a UEF of 0.95
    • Delivers up to 10.5 GPM maximum flow rate
    • X3® Scale Prevention Technology—Extends the lifespan of the water heater
    • Ultra-Low NOx Emissions—Complies with strict air quality standards
    • Flexible Installation Options—Indoor or outdoor with venting options for 2” and 3” PVC, CPVC, Polypropylene, or ABS pipes
    • User-Friendly Electronic Display—Features intuitive controls for temperature settings, on/off functionality, and error/status codes
    • Compact and Lightweight Design—Easy to install and ideal for space-saving applications
    • Cascade up to 12 like units for larger hot water demands
    • 15-year limited warranty on heat exchanger & 5-year limited warranty on parts

    • Reliance® Standard Condensing Gas Tankless Water Heaters are designed to deliver exceptional performance and efficiency for modern households. With ENERGY STAR® certification and ultra-low NOx emissions, these water heaters not only provide reliable, on-demand hot water but also contribute to a greener environment. The innovative X3® Scale Prevention Technology, integrated into select models, eliminates the need for regular scale-related maintenance, ensuring like-new performance for up to three times longer than traditional models. Whether installed indoors or outdoors, these units offer ultimate flexibility with features like 2” and 3” exhaust venting, and compatibility with various venting materials. Their user-friendly electronic display makes operation simple and intuitive.

      These models come with a 15-year limited warranty on the heat exchanger and a 5-year limited warranty on all parts, with no exclusions for hard water on X3 models. With a maximum flow rate of 10.5 GPM, these units are perfect for meeting the demands of any household. Their compact design, lightweight construction, and ability to cascade up to 12 like units make them ideal for both small and large-scale installations. Whether you're looking for efficiency, durability, or ease of use, Reliance® Standard Condensing Gas Tankless Water Heaters are the perfect solution for your hot water needs.

    Specifications
    Tech Specs
    Nominal Gallon Capacity
    1 Gallons
    UEF
    0.95
    Maximum BTUs
    199,000
    Power Source
    GAS
    Limited Parts Warranty
    5 Years
    Water Connection Location
    BOTTOM
    Water Connection Size
    0.75"
    ASME Certified
    No
    Amperes
    5
    Destination Country
    US
    ENERGY STAR® Certified
    Yes
    Flue Diameter
    2.00
    Fuel Source
    NATURAL
    Installation Type
    BOTH
    Limited Heat Exchanger Warranty 
    15 Years
    Max Flow Rate
    6 GPM
    Minimum BTUs
    10,000
    Application
    RESIDENTIAL
    Shipping Height 
    17.38
    Shipping Length 
    39.25
    Shipping Width 
    22.13
    Side Loop
    No
    Voltage
    120
    Dimension & Venting
    Type
    Water Heater
    Height
    40.41"
    Width
    17.12"
    Shipping Weight
    93 lbs
    Vent Material
    ABS, PVC, CPVC and polypropylene