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A scheduled delivery is available only Monday - Friday during normal business hours and used for heavy and oversized items (large TVs, large furniture and large appliances). This service includes delivery to the main entrance or garage (but does not include stairs). This service does not include unpacking, plugging in, installation or debris removal.

Note: Scheduled delivery services are available to most of the contiguous United States (available in parts of Alaska and Hawaii). Call 888-228-5800 for more information.

Reliance 40 Gallon Tall Natural Gas Water Heater - 640NBCT

Abt Model: 640NBCT | UPC: 091193005521
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Product Details

Reliance 40 Gallon Tall Natural Gas Water Heater - 640NBCT


  • 40,000 BTU input for faster recovery
  • Electronic gas control valve that provides precise temperature control and operational status
  • Piezo igniter allows for easy “one-hand” pilot ignition without matches
  • PEX dip tube
  • Glass-lined tank with anode rod protects against corrosion
  • “Environmentally-Friendly” Non-CFC foam insulation
  • Factory-installed PEX polymer lined heat trap nipples
  • Factory-installed temperature & pressure (T&P) relief valve


  • Capacity (Gallons): 40
  • Family Size: 4
  • Energy Factor: 0.62
  • Annual Cost of Operation: $263
  • Limited Warranty Tank: 6
  • Limited Warranty Parts: 6
  • Limited Warranty Labor: 1
  • Max BTUs Input: 40,000
  • Emissions: Low NOx
  • Foam Insulation: Yes
  • Water Connection Location: Top
  • Water Connection Size: 3/4
  • First Hour Recovery (Gallons): 69

Approximate Dimensions:

  • Height: 58 1/4"
  • Height w/Draft Hood (inches): 62"
  • Diameter: 20"
  • Width: 20"
  • Depth: 20"
  • Vent Size: 3 or 4"

Warranty Information:

  • Manufacturer Warranty(authorized online retailer):
    • 6-year limited tank & parts warranty
    • 1-year labor warranty
California customers: Proposition 65 WARNING - learn more
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Key Features
40,000 BTU Input For Faster Recovery/ Electronic Gas Control Valve/ Piezo Igniter/ Glass-Lined Tank/ 40 Gallon Capacity
Energy Star Rated
More reasons to buy the Reliance 640NBCT from Abt Electronics
  • is an authorized dealer (Learn More).
  • The Reliance 640NBCT is Brand New.
  • The Reliance 640NBCT Ships in a Factory Sealed Box.
Diameter (inches)20
Fuel TypeNatural Gas
Gallon Capacity (cu.ft.)40
Height (inches)58.25
Tank StyleTall
Venting TypeStandard
Energy Star QualifiedNo


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Delivery is subject to reasonable access to the area without damaging the purchaser's property or the product, or jeopardizing the safety of the delivery personnel.
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