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The Kenmore 55240 40-gallon residential natural gas ultra low NOx 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.
  • 12-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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Height to Gas Connection (In.) 13
Parts Warranty 12 year limited
Tank Diameter (In.) 17.75
Unit Location Indoor
Height to Water Connection (In.) 60.5
Tank Height (In.) 58.5
Water Inlet/Outlet Size 3/4 in.
Control Type Digital
Power Cord Included No
Altitude Rating (ft.) 5400
ENERGY STAR Compliant No
Gas Input (btu/hr) 40000
Heating Range (deg F.) 55 - 155
Tank Diameter Range (In.) Less than 18 In.
Color Family Gray
Height to Vent Hood (In.) 62
Recovery at 90 Degree Rise (gph.) 41
Fuel Type Natural gas
First Hour Rating (gal.) 66
Flow Rate:
Number of Anode Rods 1
Power & Performance:
Tank Lining Glass
Drain Valve Plastic
Product Includes:
Gas Inlet Size 3/4 in.
Tank Insulation Thickness 1 in.
Product Overview:
Tank Warranty 9 year limited
Maximum Operating Pressure (psi.) 150
Power Source:
Venting Atmospheric (standard)
Appliance Features:
Self Cleaning Yes
Size Category - Gallons 31 gallons to 40 gallons
Required Vent Size 3 in. or 4 in.
Low NOx Burner Yes
Uniform Energy Factor (UEF) 0.54
Tank Nominal Capacity 40 gal.
Rated Storage Volume (gal.) 38
Tank Style Tall
Heavy Duty Anode Rod Yes
Relief Valve Included Temperature and Pressure

Product Documentation

Product Warranty - English
Energy Guide

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SearsOutlet Certified
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