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 5 232 232
good product easier than I though for installation. good installation instructions. July 13, 2014
This product has been around for a long time We had purchased a simular one when we first bought our home and it has worked and served us well. Whirlpool is a good name brand and has been around for years. Their products can be trusted. July 6, 2014
Easy Installation This water heater was pretty easy to install. I replaced the original unit built in 1979. That thing lasted forever but started leaking so i picked up a whirlpool after reading lots of reviews. The only problem I had was the vent pipe not fitting easily over the vent, so i had to modify to get it to work. The only other thing I would say is they should supply the nipples for the water connections on top. Otherwise, so far so good! July 6, 2014
Updated Features I like the updated features such as the electronic starter and the new air filter which is easily cleaned. The status light is also very handy. July 4, 2014
???Easy to install How am I supposed to write a review (or recommend it) when I've only had it for 2 days? June 19, 2014
Looks better then the old one Did not like the fact, this water heater and others have the pressure relief valve on the side now. Had to replumb the drain line that goes into the wall, so the pressure relief valve will be higher then the drain line. My old water heater had the pressure relief valve on the top, with a easy shot to the drain line going into the wall. June 2, 2014
The dimensions were exactly the same as my original I wanted a name-brand with a reliable reputation. I found it in Whirlpool. I like the fact they carry a full-line of water heaters. I was able to compare different warranties, gallon sizes, energy factors, etc... I was able to match the dimensions of my existing water heater which made installation quite smooth. I also like the piezo igniter for the pilot. All in all, I feel I made the right choice. June 2, 2014
Major design flaw, needs frequent shutoff and cleaning. Barely year old, my unit shuts down every few days. Customer support is easy to reach and seemingly helpful but their recommendation to clean the flame trap is not helping. I will have to call services. My previous water heater worked 15 years with no issue. I am told the new units r more delicate n sensitive and require frequent cleaning. Cleaning is a joke ....just google and u will see it isimpracticle to clean flame trap. Regardless my flame trap is spotless n clean.... May 31, 2014
New Product Easier to Operate After having to replace gas valve last year it was nice to know You replaced the Headache I was having with the 1 I had previously purchased May 29, 2014
OK so far I have only had this product for one day. But so far it is working as it should be. May 28, 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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