40 Gallon Tall Natural Gas Water Heater - 9 Year Warranty

40 Gallon Tall Natural Gas Water Heater - 9 Year Warranty

Model: N40T91-403    Lowe's Item* #: 333570


  • FLAME LOCK® Safety System Reduces the Risk of Accidental Fires Involving Flammable Vapors
  • Electronic Gas Valve has fewer moving parts than a conventional mechanical gas valve, for durability and long life-no external power source is needed
  • Self-Diagnostic Electronic Gas Control incorporates an LED status indicator that monitors and reports on system operational status
  • Piezo Electric Igniter makes lighting the pilot fast and easy
  • Environmentally friendly polyurethane foam insulation reduces heat loss for maximum efficiency, saves money
  • Ceramic tank lining and aluminum anode rod protects tank from corrosion, for long tank life
  • Factory installed temperature and pressure relief valve ensures safe operation

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Product Dimensions
Height w/Draft Hood:62.00"
Weight:127 lbs.
Vent Type:Type B Double Wall
Vent Diameter:3"
Configuration and Overview
Capacity:40 Gallons
Family Size:4
Energy Star Certified:No
Energy Factor:0.59
Annual Cost of Operations:$277
LCD Display:No
Self Cleaning:Yes
Warranty Tank:9 Years
Warranty Parts:9 Years
Warranty Labor:1 Year
BTU Input:40,000 BTUs
Emissions Standards:Low NOx
Ignition Type:Pilot with Piezo Igniter
Foam Insulation:1 inch
Water Connection Location:Top
Water Connection Size:3/4 inch
T&P Relief Valve:Yes
Energy & Eco-Friendly
Energy Factor:0.59
40 Gallon Natural Gas Water Heater - N40T91-403 4.4 5 300 300
Easy to Install This product is easy to install and operate. My only complaint is that it is noisy while boiler is heating the water. I have it in the basement and can hear it upstairs. April 26, 2015
Easy install The unit came with good installation instructions and I really like that it heats up fast. The light on the side is a good feature also. April 24, 2015
Overall Very Good This was an easy install. I bought because of my previous good luck with Whirlpool products. I replaced the initial BRAND X water heater that the contractor put in the house when it was built 7 years ago. I would like to be given the option to write a follow up review in 9 years at the end of the warranty period. April 19, 2015
It works as advertised! Although it has only been in five days, we have hot water again and it works exactly as advertised! April 19, 2015
Good Just had it installed and water temp set on Hot which is 123 degrees coming out of lines. The system heats up fast and no leaks at this time. Have a 9 year warranty that cover labor and parts. Hope all works out like they say. (Lowes) April 17, 2015
simple to ignite not sure how long it will last. i hope it will last for as long as my bradford white did. ( 30 yrs) April 16, 2015
Easy Peasy Light, simple, easy to install. It was easy to ignite, and heated the water quickly. All this in spite of the fact that it was needed on a Sunday morning after waking up to no hot water. The flashing light that shows the system is normal, helped the wife be at ease with it. An all around great buy IMHO. It's our second Whirlpool water heater. The old one lasted 17 years! WITH NEW JERSEY WATER IN IT!!! It's a 40 gallon that is very close to the size of our old 30 gallon. Thanks for our hot water! March 29, 2015
The product was easy to understand the features it has. This product was an easy install for a homeowner with a mechanical background it took about 4 hrs if you install per the instructions. March 25, 2015
Water Heater Good replacement water heater. Heats the water well March 21, 2015

Owners Manual
Comprehensive information about your new appliance - from getting started to cleaning and maintenance - with answers to frequently asked questions.

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Troubleshooting & Repair

IMPORTANT - Read and follow the printed Installation Instructions that came with your water heater. The printed Instructions and product labels contain model-specific information, important warnings and safety notices. If you lack the necessary skills to install, troubleshoot or repair the water heater, get help from a qualified person.

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