ProLine® 40-Gallon Short Electric Water Heater

Model ENS-40 110
Capacity (Gallons)
Limited Tank Warranty
Height Classification
Blanket
First Hour Rating

  • Delivers 55-gallon first hour rating
  • Dual 4,500-watt commercial-grade heating elements deliver reliable and efficient hot water
  • Long-lasting lower Incoloy™ stainless steel element

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    What to Expect from this Model
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    Number of minutes you can enjoy a shower before running out of hot water. Assumes a 2.1 GPM flow rate
    15.1 minutes
    single shower length
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    Number of back-to-back showers you can take without running out of hot water. Assumes a 2.1 GPM flow rate and an 8 minute shower length
    1.9 showers
    back-to-back
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    Number of showers you can take at the same time without running out of hot water. Assumes a 2.1 GPM flow rate and an 8 minute shower length
    1.8 showers
    at the same time
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    Biggest tub this water heater will fill without running out of hot water. Assumes a 5.0 GPM flow rate, and a 67% fill level
    45 gallons
    max tub size
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    The estimated annual cost to operate this water heater in your location
    $524/year
    est. energy cost
    Based on location results for Columbus, OH 43215
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    Product Details
    • Delivers 55-gallon first hour rating
    • Dual 4,500-watt commercial-grade heating elements deliver reliable and efficient hot water
    • Long-lasting lower Incoloy™ stainless steel element
    • HUD compliant, approved for mobile homes/manufactured housing
    • Patented Blue Diamond® glass tank lining protects against corrosion
    • DynaClean™ automatic cleaning system protects against sediment build-up
    • Stainless steel CoreGard™ anode rod protects against corrosion longer than ordinary anodes
    • Commercial-grade brass drain valve for durable and easy operation
    • CSA Certified and ASME Rated T&P Relief Valve, Factory-Installed
    • 6-year limited tank and parts warranty

      • The ProLine® Standard Electric water heater is the reliable choice when you want to maximize hot water output and energy savings.

      The ENS-40 incorporates a 40-gallon (nominal) tank and 4,500 watts to deliver a first hour rating of 55 gallons at a Uniform Energy Factor of 0.92.

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

      This ProLine® water heater features A. O. Smith's advanced tank protection, including a stainless steel CoreGard™ anode rod, Blue Diamond® glass lining, and DynaClean™ automatic sediment-cleaning — designed to help protect the tank from the corrosive effects of water and extend the life of the water heater. The ENS-40 includes a 6-year limited tank warranty.

      A. O. Smith’s 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
    40 Gallons
    Rated Storage Volume
    37 Gallons
    UEF
    0.92
    Power Source
    ELECTRIC
    Limited Tank Warranty
    6 Years
    Limited Parts Warranty
    6 Years
    T&P Relief Valve
    Yes
    Water Connection Location
    TOP
    Water Connection Size
    0.75"
    Emissions
    Low NOx
    First Hour Rating
    55 Gallons
    ASME Certified
    No
    Blanket Included
    No
    Destination Country
    US
    Height to T&P
    40.75
    Installation Type
    INDOOR
    Max Wattage
    4,500
    Number of Elements
    2
    Application
    COMMERCIAL
    Product Tier
    ProLine®
    Shipping Height 
    53.5"
    Shipping Length 
    23.69"
    Shipping Width 
    21.5"
    Side Loop
    No
    Voltage
    240
    Dimension & Venting
    Type
    Water Heater
    Height
    49.75"
    Diameter
    20.5 in."
    Width
    20.5"
    Shipping Weight
    98lbs
    Maintenance & Troubleshooting
    Maintenance

    ProLine® Electric Adjusting the Thermostat

    ProLine® Electric Application and Installation

    ProLine® Electric Checking and Replacing Lower Heating Element.

    ProLine® Electric Checking and Replacing Upper Heating Element.

    ProLine® Electric Not Enough Hot Water

    ProLine® Electric Replacing the Lower Thermostat

    ProLine® Electric Replacing the Upper Thermostat

    Troubleshooting

    ProLine® Electric Tripped ECO

    ProLine® No Hot Water

    Marketing Videos
    ProLine® Electric Features and Benefits
    ProLine® Electric How It Works