A.O. Smith G12-T4040NVR Natural Gas Water Heater

Name: A.O. Smith G12-T4040NVR Natural Gas Water Heater
Brand: A.O. Smith
SKU: 1000542569
Price: 444.95 USD
Availability: InStock

$444.95 $809.00

Taxes included. Shipping calculated at checkout.

Nominal Capacity 30 40 50 98

Warranty 6-year limited 9-year limited 12-year limited

The A.O. Smith Signature 100 natural gas water heater delivers reliable, efficient hot water for households of up to four people. Engineered with a 40,000 BTU burner, it supplies up to 302.8 L (80 gal) of hot water within the first hour while utilizing Tank Guard technology to maximize tank durability and lifespan.

Designed with a slim tall profile for versatile indoor and closet installations, this unit features a precise electronic gas valve and an integrated safety system designed to reduce the risk of flammable vapor ignition. Double-wall atmospheric venting and high-density foam insulation help optimize thermal efficiency and everyday performance.

Key Features

Brand	A.O. Smith
Model Number	G12-T4040NVR
Series	Signature 100
Fuel Type	Natural gas
Water Heater Type	Tank
Form Factor	Tall
Nominal Capacity	151.4 L
Rated Storage Capacity	143.8 L
BTU Rating	40000
First Hour Rating	302.8 L
Recovery at 90°F (50°C) Rise	155.2 L/hr
Uniform Energy Factor (UEF)	0.64
Ignition Type	Piezo
Venting Type	Atmospheric (Type B Double Wall)
Vent Diameter	3-in
Water Connection Size	3/4-in
Water Connection Location	Top
Height	156.8 cm
Diameter	50.8 cm
Width	50.8 cm
Depth	50.8 cm
Weight	62.6 kg
Insulation Thickness	5.1 cm
Emission Rating	Low NOx
High Altitude Compatible	Yes
Safety Certifications	CSA safety listing, AHRI Certified

Highlights

40,000 BTU gas burner delivers 80 gallons of hot water in the first hour
Precise electronic gas valve
Built-in safety system to prevent flammable vapor ignition
Slim design for installation in tight spaces
Tank Guard technology for increased longevity

Warranty

12-year limited warranty

Downloads

Frequently asked questions

What fuel source does this water heater require?

This model operates on natural gas.

What is the first-hour hot water delivery rating?

The 40,000 BTU burner provides up to 302.8 L (80 gal) of hot water within the first hour.

Can this water heater be installed inside a closet?

Yes, it is designed for indoor and closet installations with proper Type B double-wall venting.

What size water connections does this unit use?

It features standard 3/4-in top water connections.

Made with care

Great value

Elegant design

Quality materials

This product is crafted with quality materials to ensure durability and performance. Designed with your convenience in mind, it seamlessly fits into your everyday life.

Orders typically ship within 5–7 business days. Returns are accepted within 30 days of delivery — see our Shipping Policy and Refund & Return Policy pages for full details.