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 5 242 242
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
This product makes hot water fast! This water heater was simple to install and makes hot water very fast. I like the 9 year warranty, and I trust Whirlpool for a long lasting product. August 30, 2014
Easy to Install easy to install - 9 year warranty hope I don't need it August 15, 2014
easy to install and start This water heater was easy to light up and adjust. I liked the simplicity of getting heater fired up and running. August 12, 2014
Quality Control My water heater went out on a Sunday morning. I purchased a new one at Lowe's. No problem with the installation until it filled. Then I discovered a leak on the inlet valve coming from the new heater. I turned everything off and disconnected the heat nipple where the leak appeared to be coming from and rewrapped new Teflon tape around the nipple again. I reconnected the inlet water and turned on the water again. It still leaked. I have installed many water heaters in my time so I new the product was defective. The water was exiting from the outside of the factory installed inlet, not the threads. I purchased another new heater from Lowe's just like the first and that one works fine. I went through a lot of trouble in reference to that bad inlet valve due to poor QUALITY CONTROL on the side of the manufacture. I did purchase the extended warranty so I won't have to go through this again if this one has a failure elsewhere on the unit. I am curious how long the status light will flash with the pilot on and if it will at least last as long as the 9 year warranty. We'll see. August 11, 2014
This is a great product This is our 2nd Whirlpool Water heater, we had the last one for about 12 years. The one we purchased this time we are confident it will last that long as well July 29, 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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