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9 Years Tank & Parts Warranty

2 Years Service Labor Warranty

Model G9-S4040NVR

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40,000 BTU
Diameter 22 Height 51 1/2 (Top of Vent)

AO Smith


40 Gallon

Natural Gas

Water Heater


Installation Included!
Pre-Approval Takes Only Minutes! 
For Informational Purposes only

A. O. Smith Signature 100 Series 40-Gallon Short Low NOx Atmospheric Vent Natural Gas Water Heater is designed to provide efficient and reliable hot water for households with 3 to 4 people when sized appropriately. With an environmentally friendly 40,000 BTU Low NOx gas burner, this model delivers 67 gallons of hot water in the first hour. It features an electronic gas valve that provides precise temperature control for optimum hot water delivery without needing an external power source. For your convenience, the gas valve also includes an LED status indicator for diagnostics reporting and a push-button ignition to simplify the startup process. This A. O. Smith 40-gallon model is designed with your safety in mind. With a built-in safety system, this model reduces the risk of accidental flammable vapor ignitions. A factory-installed temperature and pressure relief valve and tamper-proof drain valve also ensure safe operation. This model is built to last. It features a protective anode rod and a ceramic fused tank shield designed to reduce corrosion and provide ultimate tank protection. It also features a self-cleaning dip tube designed to reduce sediment build-up and extend the overall life of the water heater. This added protection comes with a 9-year limited warranty for additional peace of mind.

  • Ideal hot water delivery for households with 3-4 people when sized appropriately

  • Environmentally friendly 40,000 BTU Low NOx gas burner delivers 67 gallons in the first hour

  • Electronic gas valve provides precise temperature control for optimum hot water delivery

  • Self-diagnostic electronic gas control incorporates an LED status indicator that monitors and reports on system operational status

  • Built-in safety system reduces the risk of accidental flammable vapor ignitions

  • Short 51.5-in H x 22-in diameter design is ideal for condensed spaces like under staircases and closet installations

  • Protective anode rod and fused ceramic tank shield provide superior tank protection and extend water heater life

  • 9-Year limited tank and parts, 2-Year limited labor warranty gives you peace of mind

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25.2 Minute Continuous Single Shower


2 Showers At The Same Time

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60 Gallon Max Tub Size

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Use & Care Manual 

Installation Includes

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Delivery of New Water Heater

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Free Drain Pan

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Haul Away & Recycling of Old Tank

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New Water Heater Start-Up

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New Connectors for Gas / Water / Vent

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Gas Piping Inspection / Leak Check

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3-Year Warranty On Installed Plumbing

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Installation In Same Location 

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Permit Processing if Required

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