A.O. Smith Signature 100 G12-S4040NVR Natural Gas Water Heater

Name: A.O. Smith Signature 100 G12-S4040NVR Natural Gas Water Heater
Brand: A.O. Smith
Price: 455.95 USD
Availability: InStock

$455.95 $829.00

Taxes included. Shipping calculated at checkout.

Nominal Capacity 30 40 50 74

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

The A.O. Smith Signature 100 atmospheric vent natural gas water heater delivers dependable and efficient hot water performance for residential applications. Featuring a compact short profile, this tank model incorporates an advanced electronic gas valve that provides precise temperature control without requiring an external power source.

Equipped with a 40,000 BTU low NOx gas burner, it provides a strong first-hour rating of 246 L to reliably support households of up to 4 people. Built-in safety features include a flammable vapor ignition prevention system, factory-installed temperature and pressure relief valve, and an LED diagnostic status indicator.

Key Features

Brand	A.O. Smith
Model Number	G12-S4040NVR
Series	Signature 100
Fuel Type	Natural Gas
Water Heater Type	Tank
Water Heater Style	Short
Vent Type	Atmospheric (Type B Double Wall)
BTU Rating	40,000
Uniform Energy Factor	0.58
First Hour Rating	246 L
Recovery Rate at 50°C Rise	155.2 L/h
Nominal Capacity	151.4 L
Rated Storage Capacity	143.8 L
Family Size Recommendation	4
Ignition Type	Piezo
Emission Rating	Low NOx
Vent Diameter	7.6 cm
Water Connection Location	Top
Water Connection Size	3/4-in
Insulation Thickness	5.1 cm
Overall Height	130.8 cm
Diameter	55.9 cm
Product Weight	61.2 kg
High Altitude Certified	Yes
Safety Certifications	CSA safety listing, AHRI Certified

Highlights

40,000 BTU low NOx gas burner
65 gallons of hot water in the first hour
Electronic gas valve allows for precise temperature control without external power
LED status indicator for diagnostics
Built-in system to prevent flammable vapor ignitions
Pressure relief valve
Tank protection enhancements
Compact design
High-altitude certified

Materials & care

Ensure regular inspection of the temperature and pressure relief valve and check the venting system periodically for clear airflow and proper draft.

Warranty

12-year limited warranty

Downloads

Frequently asked questions

What type of venting is required for this water heater?

It uses a standard atmospheric venting configuration designed for Type B double-wall venting systems with a 7.6 cm vent diameter.

Does the electronic gas control valve require an electrical outlet?

No, the electronic gas valve operates and provides precise temperature regulation without needing an external power source.

What is the first-hour hot water delivery rating?

The unit delivers 246 L (65 gallons) of hot water within the first hour of operation.

Is this model suitable for high-altitude installations?

Yes, this natural gas water heater is certified for high-altitude operation.

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.