ProLine® Low NOx 50-Gallon Atmospheric Vent Tall Liquid Propane Water Heater

Model GS6-50-RCT 401
4.9 out of 5 Customer Rating
ProLine® Low NOx 50-Gallon Atmospheric Vent Tall Liquid Propane Water Heater is rated 4.7 out of 5 by 988.
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Capacity (Gallons)
Limited Tank Warranty
Height Classification
Fuel Source
Advanced Options
First Hour Rating
Maximum BTU's
Side Loop
Diameter

  • Meets Your Hot Water Demands—Delivers an 89-gallon first hour rating
  • Energy Efficient—45,000 BTU input atmospheric vent design delivers up to 0.61 Uniform Energy Factor
  • Eco-Friendly Design Reduces Emissions—Patented Green Choice® Gas Burner design reduces NOx emissions by up to 33% and complies with Low NOx emission requirements

    • ProLine® Low NOx 50-Gallon Atmospheric Vent Tall Liquid Propane Water Heater
    Model GS6-50-RCT 401
    4.9 out of 5 Customer Rating
    ProLine® Low NOx 50-Gallon Atmospheric Vent Tall Liquid Propane Water Heater is rated 4.7 out of 5 by 988.
    • y_2025, m_9, d_3, h_9
    • bvseo_bulk, prod_bvrr, vn_bulk_3.0.42
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    • co_hasreviews, tv_164, tr_824
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    Product Details
    • Meets Your Hot Water Demands—Delivers an 89-gallon first hour rating
    • Energy Efficient—45,000 BTU input atmospheric vent design delivers up to 0.61 Uniform Energy Factor
    • Eco-Friendly Design Reduces Emissions—Patented Green Choice® Gas Burner design reduces NOx emissions by up to 33% and complies with Low NOx emission requirements
    • Simple Ignition—Push-button piezo ignitor makes lighting pilot fast & easy
    • Easy-to-Use Controls—Intelligent electronic gas control provides precise temperature control and LED status indicator
    • Corrosion Protection—Patented Blue Diamond® glass tank lining protects against corrosion
    • Auto-Cleaning Feature—DynaClean™ automatic cleaning system protects against sediment build-up
    • Long-Lasting Anode—Stainless steel CoreGard™ anode rod protects against corrosion longer than ordinary anodes
    • Simple Drainage—Commercial-grade brass drain valve for durable and easy operation
    • Peace of Mind—6-year limited tank and parts warranty for added peace of mind

      • The ProLine® GS6-50-RCT 50-Gallon Atmospheric Vent Tall Liquid Propane Water Heater is designed to deliver an economical performance that can lower your energy bills and provide long-lasting value.

      Featuring a 50-gallon (nominal) tank and a 45,000 BTU propane burner, the GS6-50-RCT Atmospheric Vent delivers a first hour rating of 89 gallons and a recovery rate of 54 gallons per hour. It carries a 6-year limited tank warranty and meets Low NOx emission requirements.

      Environmentally-friendly insulation and factory-installed heat trap nipples reduce heat loss for maximum energy savings.

      This ProLine® water heater is designed with State’s advanced tank features, including a stainless steel CoreGard™ anode rod, Blue Diamond® glass lining and a self-cleaning dip tube—designed to help protect the tank from the corrosive effects of water and extend the life of the water heater.

      State ProLine® water heaters are residential products built to commercial-grade standards and are only available for purchase through professional wholesalers and contractors.

    Specifications
    Tech Specs
    Nominal Gallon Capacity
    50 Gallons
    Rated Storage Volume
    48 Gallons
    UEF
    0.61
    Maximum BTUs
    45,000
    Power Source
    GAS
    Limited Tank Warranty
    6 Years
    Limited Parts Warranty
    6 Years
    T&P Relief Valve
    Yes
    Water Connection Location
    TOP
    Water Connection Size
    0.75"
    First Hour Rating
    89 Gallons
    ASME Certified
    No
    Blanket Included
    No
    Destination Country
    US
    Flue Diameter
    4.00
    Fuel Source
    PROPANE
    Height to T&P
    50.50
    Ignition Type
    Pilot with Piezo Igniter
    Installation Type
    INDOOR
    Application
    RESIDENTIAL
    Shipping Height 
    60.81
    Shipping Length 
    26.13
    Shipping Width 
    23.13
    Side Loop
    No
    Dimension & Venting
    Type
    Water Heater
    Height
    60.75"
    Diameter
    22"
    Shipping Weight
    165 lbs
    Vent Type
    Atmospheric Vent
    Height to Gas Valve
    12.25"
    Maintenance & Troubleshooting
    Maintenance

    Residential Series Atmospheric Vent Lighting the Pilot

    Troubleshooting

    Residential Series Atmospheric Vent Draft Test

    Residential Series Atmospheric Vent No Hot Water

    Residential Series Atmospheric Vent Status Code 1 Flash

    Residential Series Atmospheric Vent Status Code 2 Flash

    Residential Series Atmospheric Vent Status Code 4 Flash

    Residential Series Atmospheric Vent Status Code 5 Flash

    Residential Series Atmospheric Vent Status Code 7 Flash

    Residential Series Atmospheric Vent Status Code 8 Flash

    Residential Series Atmospheric Vent Status Code Light Continuous

    Marketing Videos
    Residential Series Atmospheric Vent Application and Installation
    Residential Series Atmospheric Vent Features and Benefits
    Residential Series Atmospheric Vent How It Works
    Find a Replacement
    Current Product
    Option 2
    ProLine® Low NOx 50-Gallon Atmospheric Vent Tall Liquid Propane Water Heater
    Adapt™+ Premium Condensing 199,000 BTU Natural Gas Tankless Water Heater
    GS6-50-RCT
    STHR-199M
    current Product
    option 1
    Rebates up to $300 +
    Rebates up to $300 +
    Nominal Capacity
    50 Gallons
    Rated Storage Volume
    48 Gallons
    Diameter
    22"
    Width
    16.53"
    Depth
    26.25"
    16.12"
    Height
    60.75"
    34"
    Shipping Weight
    165lbs
    125lbs
    Power Source
    GAS
    GAS
    Limited Tank Warranty
    6 Years
    0 Years
    Limited Parts Warranty
    6 Years
    5 Years
    T&P Relief Valve
    Yes
    Water Connection Location
    TOP
    BOTTOM
    Water Connection Size
    0.75"
    3/4-in"
    First Hour Rating
    89 Gallons
    Thermal Efficiency
    0%
    0%
    All Reviews for ProLine® Atmospheric Vent (400 series)
    Rated 5 out of 5 by from Quiet and good features Purchased and installed and very pleased with the product.
    Date published: 2025-08-18
    Rated 5 out of 5 by from Good product. 2nd of this water heater model by the same company last one made it 9 years, hope this one does too. Great installer, and great service company.
    Date published: 2025-07-20
    Rated 5 out of 5 by from Well built and efficient. This handles all our hot water needs.
    Date published: 2025-06-17
    Rated 5 out of 5 by from New Water Heater Large tank, fast recovery of hot water, no issues so far.
    Date published: 2025-06-14
    Rated 5 out of 5 by from Good features. Great product. Second water heater of this brand in my lifetime.
    Date published: 2025-06-14
    Rated 5 out of 5 by from Just installed Looks great and works great, happy with the performance.
    Date published: 2025-06-06
    Rated 5 out of 5 by from Great Tank! Had this Water Heater installed 4/21/2025, so far so good, lots of hot water and very efficient!
    Date published: 2025-05-04
    Rated 5 out of 5 by from Great Product! Great Quality and heats quickly. Excellent quality with metal fittings.
    Date published: 2025-04-18
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