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The Kenmore 57940 40-gallon short 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. It also includes a self-cleaning cold water inlet tube that reduces and protects against mineral build-up in the tank. A 40-gallon liquid propane water heater is the minimum recommended size for a 2- to 4-person household with typical water use. California residents:  If you live in an air quality management district that requires a low-emission water heater,  click  to see all water heaters that meet local requirements. Districts include Bay Area, Sacramento Metro, San Joaquin Valley, Santa Barbara, South Coast (most of LA county), Ventura County and Yolo-Solano.  Click  for a searchable ZIP code list. For help, call 1-800-549-7853.
  • 9-year warranty on tank and parts
  • Energy-efficient foam insulation
  • Self-cleaning cold water inlet tube
  • Cobalt blue glass-lined tank with anode rod for corrosion protection
  • Factory-installed temperature and pressure relief valve


Color Family Gray
Size Category - Gallons 31 gallons to 40 gallons
Parts Warranty 9 year limited
Tank Warranty 9 year limited
Power and Performance:
Energy Factor 0.62
First Hour Delivery (gal.) 69
Fuel Type Natural gas
Gas Input (btu/hr) 40000
Heating Range (deg F.) 55 - 155
Recovery at 90 Degree Rise (gph.) 41
Dimensions and Capacity:
Gas Inlet Size 3/4 in.
Height to Gas Connection (In.) 12.25
Height to Water Connection (In.) 49.75
Height to Vent Hood (In.) 51.5
Required Vent Size 3 in. or 4 in.
Tank Capacity 40 gal.
Tank Diameter (In.) 22
Tank Height (In.) 47.75
Tank Insulation Thickness 2 in.
Water Inlet/Outlet Size 3/4 in.
General Features:
Altitude Rating (ft.) 10100
Control Type Digital
Drain Valve Plastic
Heat Trap Fittings Yes
Heavy Duty Anode Rod Yes
Low NOx Burner No
Number of Anode Rods 1
Relief Valve Included Temperature and Pressure
Self Cleaning Yes
Tank Lining Glass
Tank Style Short
Unit Location Indoor
Power Cord Included No
Product Overview:
Maximum Operating Pressure (psi.) 150
ENERGY STAR Compliant No

Product Documentation

Product Warranty - English
Energy Guide

Energy Star Logo   Energy Guide Logo

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


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