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The Kenmore 55940 40-gallon residential natural gas water heater is energy-efficient, with foam insulation, and has a cobalt blue glass-lined tank with a large anode rod to protect the tank from corrosion. A 40-gallon natural gas water heater is the minimum recommended size for a 2- to 4-person household with typical water use.
  • 9-year warranty on tank and parts
  • 1 inch of energy-efficient foam insulation
  • Self-cleaning cold water inlet tube
  • Cobalt blue, ultra-coat, glass-lined tank with anode for corrosion protection
  • Factory-installed temperature and pressure relief valve

Protection Agreements

One smart decision calls for another. Safeguard your new purchase with the best repair and replacement coverage in the business. A Sears Protection Agreement picks up where the limited manufacturer's warranty leaves off. Enjoy the peace of mind that comes from having a plan that delivers what it promises. (Learn More)
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Gas Inlet Size 3/4 in.
Tank Diameter Range (In.) Less than 18 In.
Height to Gas Connection (In.) 13
Height to Vent Hood (In.) 62
Height to Water Connection (In.) 60.5
Tank Diameter (In.) 17.75
Tank Height (In.) 58.5
Tank Insulation Thickness 1 in.
Water Inlet/Outlet Size 3/4 in.
Size Category - Gallons 31 gallons to 40 gallons
Tank Nominal Capacity 40 gal.
Rated Storage Volume (gal.) 38
Color Family Gray
Uniform Energy Factor (UEF) 0.54
Materials & Finishes:
Drain Valve Plastic
Tank Lining Glass
Flow Rate:
First Hour Rating (gal.) 66
Recovery at 90 Degree Rise (gph.) 41
Power & Performance:
Gas Input (btu/hr) 40000
Maximum Operating Pressure (psi.) 150
Parts Warranty 9 year limited
Tank Warranty 9 year limited
Product Includes:
Power Cord Included No
Relief Valve Included Temperature and Pressure
Product Overview:
Unit Location Indoor
Control Type Digital
Power Source:
Fuel Type Natural gas
Certifications & Ratings:
Altitude Rating (ft.) 5400
ENERGY STAR Compliant No
Appliance Features:
Heat Trap Fittings Yes
Heavy Duty Anode Rod Yes
Low NOx Burner Yes
Number of Anode Rods 1
Self Cleaning Yes
Tank Style Tall
Venting Atmospheric (standard)
Heating Range (deg F.) 55 - 155
Required Vent Size 3 in. or 4 in.

Product Documentation

Product Warranty - English
Energy Guide

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Manufacturer's Warranty
1 year parts and labor
SearsOutlet Certified
Find Out More »


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