Kenmore 57240 40 gal. 12-Year Tall Natural Gas Water Heater



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
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Tank Insulation Thickness2 in.
Tank Diameter (In.)20
Tank Height (In.)58.25
Tank Diameter Range (In.)18 In. to 22 In.
Height to Water Connection (In.)60.25
Water Inlet/Outlet Size3/4 in.
Height to Vent Hood (In.)62
Gas Inlet Size3/4 in.
Height to Gas Connection (In.)12.25

Appliance Features:

Number of Anode Rods2
Heat Trap FittingsYes
Tank StyleTall
Low NOx BurnerNo
Heavy Duty Anode RodYes
Self CleaningYes
VentingAtmospheric (standard)

Product Overview:

Unit LocationIndoor

Power & Performance:

Gas Input (btu/hr)40000
Maximum Operating Pressure (psi.)150


Color FamilyGray

Materials & Finishes:

Drain ValvePlastic
Tank LiningGlass


Heating Range (deg F.)55 - 155


Tank Nominal Capacity40 gal.
Size Category - Gallons31 gallons to 40 gallons
Rated Storage Volume (gal.)38


Uniform Energy Factor (UEF)0.66

Flow Rate:

Recovery at 90 Degree Rise (gph.)41
First Hour Rating (gal.)80


Control TypeDigital

Power Source:

Fuel TypeNatural gas


Required Vent Size3 in. or 4 in.


Parts Warranty12 year limited
Tank Warranty12 year limited

Certifications & Ratings:

Altitude Rating (ft.)10100

Product Includes:

Power Cord IncludedNo
Relief Valve IncludedTemperature and Pressure

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