40 Gallon Tall Natural Gas Water Heater - 12 Year Warranty

40 Gallon Tall Natural Gas Water Heater - 12 Year Warranty

Model: N40T121-403    Lowe's Item* #: 333564


  • 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:12 Years
Warranty Parts:12 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 - N40T121-403 4.6 5 143 143
Hottest water so far! Wow! What a difference in the amount of hot water! Out unit is set only at hot and it cranks out more hot water than our 16 year old heater ever did! I did not rate the quality yet is it was just installed, but it seems like a well built unit. Like the darker color gray vs the white color. My friend just bought a 50 gallon 6year Whirlpool hot water heater, but I decided to go for the 40 gallon but with a 12 year warranty for the piece of mind, especially with the new sensors up front. We'll see if it lasts that long! July 14, 2011
INSTALLATION previous water heaters have had stems on top to attact in and out hoses. This one did not. It had two holes with nylon treads. That was the first of about four trips back to Lowes. according to the plumber, that I hired to innstall the water heater, Lowes sold me the wrong parts for these in and out conections with the nylon treads. He also said Lowes is the only place in town that he knows of to buy Whirlpool parts. (this is the same problem I discovered when I tried to have my old waterheater repaired. My old Whirlpools waterheater was a nine year and lived shortly longer. I liked the old one and that is why I purchased this twelve year heater. that brings up another point. It cost me $463. to have it innstalled. I cant imagine buying one with shorter life at that high cost of installing. April 15, 2014
whirlpool water heater it was very easy to install and lighting the pilot was simple April 9, 2014
Big improvement over previous heater Easy to use. Nice clean installation and completed is a timely manner. April 8, 2014
Easy install and setup This was the first time I have had to install a hot water heater. The manual was straight forward and easy to follow. March 29, 2014
Installed it myself The new unit is nice to look at and was easy to install. The hardest part was getting the old water heater out sine we were only able to drain a little over half of the water. I replaced all water and gas lines and bought a water heater jacket as long I as was changing it out. Putting this new one in was much easier. I will need to cut an access panel in the door of the closet because the control unit sticks out further than my old one. This thing heated up quickly. Lighting the pilot was a snap. The instruction booklet stated that I was watching for a red light to blink when the pilot is lit. the light on the unit is white. was a little confused thinking it needed to change to red to be lit. The burner kicked on however and I learned my lesson quickly. Very happy with the purchase. (Well as happy as you can be when you have to replace a water heater!) /I expect to get a number of good years of use from it. March 23, 2014
40 Gallon Heater for a family of 4 This water heater replaced a 10-yr old 50 gallon and seems to keep up fine with 2 adults and two young children. We do not use 2 showers at the same time, but I'm sure that would not be a problem as the recovery rate is the same or slightly better than 50 gallon units. The lint guard around the bottom is the only place for improvement. It was relatively cheep and did not fit properly when trying to install in a confined space. The 40 gallon tank width allowed for a tight installation and gave us room to install a water softener that would not have fit possibly with the old 50 gallon water heater. We're happy we replaced the 50 with a 40. It should save some money and keeps up with us fine. March 23, 2014
Nice looking and, so far so good. We have many Whirlpool appliances, and they have always been reliable. It looks good and is work as expected. March 16, 2014
Great Product Great Product, easy installation, and nice looking to boot. March 8, 2014
This is a great product overall. The installation was easy enough considering the small area in which water heater is located. Installation guide was helpful. I will definitely recommend the product to others. March 4, 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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