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The Kenmore 57240 40-gallon tall natural gas water heater is energy-efficient, with foam insulation, and has a cobalt blue glass-lined tank with 2 heavy duty anode rods to protect the tank from corrosion. It also includes a self-cleaning cold water inlet tube which reduces and protects against mineral build-up in the tank. 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
  • 2 inches of energy-efficient foam insulation
  • Self-cleaning cold water inlet tube
  • Cobalt blue glass-lined tank with dual anode rods for corrosion protection
  • Factory-installed temperature and pressure relief valve


Gas Inlet Size3/4 in.
Height to Gas Connection (In.)12.25
Height to Vent Hood (In.)62
Height to Water Connection (In.)60.25
Tank Diameter (In.)20
Tank Height (In.)58.25
Tank Insulation Thickness2 in.
Water Inlet/Outlet Size3/4 in.
Size Category - Gallons31 gallons to 40 gallons
Tank Nominal Capacity40 gal.
Rated Storage Volume (gal.)38
Certifications & Ratings
Altitude Rating (ft.)10100
Color FamilyGray
Control TypeDigital
Materials & Finishes
Drain ValvePlastic
Tank LiningGlass
Uniform Energy Factor (UEF)0.66
Flow Rate
First Hour Rating (gal.)80
Recovery at 90 Degree Rise (gph.)41
Power Source
Fuel TypeNatural gas
Power & Performance
Gas Input (btu/hr)40000
Maximum Operating Pressure (psi.)150
Appliance Features
Heat Trap FittingsYes
Heavy Duty Anode RodYes
Low NOx BurnerNo
Number of Anode Rods2
Self CleaningYes
Tank StyleTall
VentingAtmospheric (standard)
Heating Range (deg F.)55 - 155
Parts Warranty12 year limited
Tank Warranty12 year limited
Product Includes
Power Cord IncludedNo
Relief Valve IncludedTemperature and Pressure
Required Vent Size3 in. or 4 in.
Product Overview
Unit LocationIndoor

Manufacturer's Warranty
1 year parts and labor
American Freight Certified
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