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 4.5 5 248 248
So far so good! This water heater is replacing a 16 year old A O Smith and I had it installed professionally because it is in the attic...! I was limited to the water heaters due to the opening size going to the attic but this water heater is 18" in diameter and fit fine thru the opening. October 20, 2014
Great Water Heater This is a great water heater. It installs fast, and lights up easily. October 19, 2014
Love it - Easy to operate Took about 2 1/2 hrs to remove old unit and install new water heater. Everything fit back just fine. Fast recovery time for hot water. Only took about 1 1/2 hrs to have hot water after unit was turn on. Looks good next to my new Whirlpool Furnace and A/C. Very quiet heater. At first I had to check a couple times to see if it was still operating since it is so quiet. October 13, 2014
State of the Art Water Heater Wow, had the unit installed professionally but it went really smooth. Unit checks itself and gives a readout on the front panel without any electrical hookup! Quiet running and great hot water service. I like it!!! October 5, 2014
Very easy to start This water heater is so easy to get started after installed, its a total feeling of safety but really it is a whirpool american made and theres comfort in the name whirlpool.. enough said September 28, 2014
Ease of installation. Easy to use This unit is easy to install and 2 people are recommended. It is not hard to install if you have some plumbing skills. If not, hire it done. My old unit was a Whirlpool 50 gal. that sprung a leak 6 mos. b/4 warranty was up. Bummer. We can get by with 40 gal. so we bought a new one. The unit is easy to use and the pilot light is easy to lite. The sensor that gives off a signal is nice to be able to keep up with what the unit is doing. I expect my energy bill to be about the same as with the old unit which wasn't bad at all. I would recommend this unit. September 24, 2014
seems to be well designed and constructed, easy to install, good value so far it seems to be everything we wanted and was a good value from lowe's September 5, 2014
nice apperance controls very easy to use Easy to install, plumber said he likes these heaters September 2, 2014
Easy to install... Easy to install. Had to buy di-electric nipples which was not included. It made fizzle sounds upon filling and lighting the pilot light but it was because excess condensation on the tank that needed to dissipate and the noise stopped. September 1, 2014
Good product! Easy to install, works very well. It's heavy, though, so have your brother-in-law help lift it! August 30, 2014

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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