At a Glance
A.O. Smith Signature 300 40-Gallon Tall 12-year Limited 40000-BTU Natural Gas Water Heater
Item #839885 |
Model #G12-CADT4040NV
Delivers the ideal amount of hot water for households with 3 to 4 people when sized appropriately
Fitted with an automatic flue damper that opens and closes automatically to increase efficiency and reduce heat loss in standby mode
Simple installation that uses standard 3-in or 4-in vent ducting and requires no power
Features an environmentally friendly 40,000 BTU low NOx gas burner that delivers 82 gallons in the first hour
Tank Guard® provides advanced tank protection that extends the life of your gas water heater
Tall, slim 62.5-in high x 20-in diameter profile enables easier installation in narrow spaces
High-altitude certified from 0 ft to 10,100 ft
Provides peace of mind with a 12-year limited tank and parts guarantee and a 3-year limited labor warranty
General | |||
|---|---|---|---|
Series Name | Signature 300 | Fuel Type | Natural gas |
Type | Tank | Ignition Type | Piezo |
Power Source | Gas | Venting Type | Atmospheric |
Grade | Residential | Vent Type | Type B double wall |
Use Location | Indoor | ||
Dimensions | |||
|---|---|---|---|
Depth (Inches) | 20 | Rated Storage Capacity | 38-Gallon |
Diameter (Inches) | 20 | Vent Diameter(s) | 3-in; 4-in |
Family Size | 4 | Water Connection Size | 3/4-in |
Height (Inches) | 62.5 | Weight (lbs.) | 135 |
Insulation Thickness (Inches) | 2 | Width (Inches) | 20 |
Nominal Capacity (Gallons) | 40 | ||
Features | |||
|---|---|---|---|
Annual Fuel Utilization Efficiency % (Percentage) | 0 | Pilot Reset Button | Yes |
BTU Rating | 40000 | Point of Use | No |
Emission Rating | Low NOx | Scale Prevention | No |
Foam Insulation | Yes | Super High Efficiency | No |
GPH Recovery at 90 Degrees F (Gallons) | 40 | Temperature and Pressure Relief Valve | Yes |
Grid Capable | No | Uniform Energy Factor | 0.68 |
High Altitude Model | Yes | Water Connection Location | Top |
Pilot Light Window | Yes | Water Heater Style | Tall |
Compatibility | |||
|---|---|---|---|
Bluetooth Compatibility | No | Works with iOS | No |
Smart Compatible | No | Works with SmartThings | No |
Wi-Fi Compatibility | No | Works with the Google Assistant | No |
Works with Amazon Alexa | No | For Use with Mobile Homes | No |
Works with Android | No | For Use with RVs | No |
Works with Apple HomeKit | No | ||
Warranty | |||
|---|---|---|---|
Warranty | 12-year limited | ||
Certifications | |||
|---|---|---|---|
CA Residents: Prop 65 Warning(s) | Safety Listing | UL safety listing | |
ENERGY STAR Certified | No | ||
Miscellaneous | |||
|---|---|---|---|
UNSPSC | 40101800 | ||
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Ratings may include incentivized customer reviews.
What Customers Are Saying
The water heater has received mixed reviews. Positive aspects include easy installation, a 12-year warranty, quick heating, ample hot water, and quiet operation. Customers also found the product to be good value and quality. However, some experienced issues such as gas leaks, igniter problems, and the unit shutting off prematurely. There were also reports of receiving damaged units. Overall, the water heater can be a reliable and efficient option, but quality control and customer support need improvement to address the problems some customers have faced.
Customer review summary generated by AI, including incentivized reviews.Quality
I just got it installed. Working great so far. I need to come back after a year or so to explain more about it. I had experience with A. O. Smith water heaters for commercial use and they are really great I was so impressed of their quality and durability. So that’s why I bought this heater for my house. I expect nothing less than that
From aosmith.com
NICE ITEM
Had professional installed. removed old tank and replumed lines.
From aosmith.com
good brand
easy to install. i installed the one we replaced and all hookups matched up.
From aosmith.com
Very happy with the performance .
Very happy with my new water heater. Heats up fast and plenty of hot water. One thing to remember that if it say 20 inches that does not include the controls so add several extra inches as this was almost 4 extra. It would not fit the existing Water heater shed 24x24 and it had to be enlarged 30x30 so unit would fit.
From aosmith.com
Works quietly, efficiently, and powerfully.
My previous water heater is a ProMax , and this model ProLine replaced it.
From aosmith.com
The customer rep was SUPER helpful
Price (clearance item)
Verified Purchaser
Fast heat up.
A great gas water heater. I bought this 40 gallon gas water with 12yr warrantees. Hot water supply for 4 people home. Hot water heats up fast and runs quietly. Great product
From aosmith.com
Easy to use
after installation it was very easy to turn on and it works great
From aosmith.com
hot water
i bought this 5 days ago and works great, lots of hot water.
From aosmith.com
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