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 5 292 292
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
Quick & easy It didn't come with the installation kit but once we had all the pieces/parts the installation went really quick. Push button ignition worked great and it gets the water nice and hot. Only had it for a few days so far, but so far we are pleased with the quality and output. March 20, 2015
It is a good product. We always had a Whirlpool gas water heater. We replaced the original one ( 1979 installation) in 1993 followed by one in December 2005 followed by current replacement. Each time with Whirlpool , 40 gallons gas heater. We regret that 9 yeras warrantee on the one replaced in 2005 expired on Dec 3, 2014 and lasted only 3 months beyond the warrantee period. This is our first negative experience on Whirlpool products that we always held in high esteem. It may be an indication of poor quality of American products. However, we will not let one negative experience to erase good experiences in past. This is why we chose to stay with the Whirlpool gas fired water heater and purchased one with a 9 year guarantee. March 14, 2015
It heats water. :) How does a woman review a product she about which she knows nothing but it heats water for her and her family's benefit? Just saying. February 27, 2015
The simplicity of this unit is geat. Light weight, very easy to install, quick turn around for hot water. don't run out and I do 3 to 4 loads of laundry a day plus the normal house hold use. Haven't seen my energy bill yet but hoping it decreases.. it should. February 27, 2015
Easy to install. This heater fit exactly as the old one (which was 8 years old). I like the new system that tells the code status of the function mode of the heater. The flashing light every 3 seconds is a nice feature. February 23, 2015
The design of this heater fit right where my old one was before I purchased this new one. Satisfied customer with installation and size of heater. February 18, 2015
Great features easy to install. Sales people @ Lowes need to be more aware of extras needed to install...ie nipples, had to make return trip because they believed nipples were included in box. February 16, 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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