40 Gallon Tall Natural Gas Water Heater - 12 Year Warranty

40 Gallon Tall Natural Gas Water Heater - 12 Year Warranty

Model: NU40T121-403    Lowe's Item* #: 333573


  • 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 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
  • Ultra Low NOx

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Product Dimensions
Height w/Draft Hood:62.25"
Weight:129 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:Ultra 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
Ultra Low NOx:Meets SCAQMD Rule 1121
40 Gallon Natural Gas Water Heater - NU40T121-403 4.5 5 59 59
Easy to install and fire up. Very impressed with the smart technology on this water heater. Provides useful information and easy troubleshooting. November 15, 2014
This product was available at Lowe's close to my home. This product was the size I needed. I hope it works well for the 12 years it is warranted for. November 13, 2014
I'm old school, hope the tyechnology endures. I noticed after a few months the temperature started cooling without adjusting the setting. October 27, 2014
Lowes & Whirlpool brand name My purchase was at Lowes, Palm Desert, CA on October 11, 2014. The Lowes Department Mgr. and staff were more qualified and product educated versus when I made my visit to Home Depot. Most importantly, Lowes has a working relationship/contract with a company for installing the water heater. The Install Sales Dept. scheduled the appointment for me. I am familiar with the Whirlpool name but not the Water Heater. As a result I would not know how to evaluate the product features & rating. I would recommend the product because of the Lowes and Whirlpool brand name. Larry Prelesnik October 21, 2014
great value and features! this product was very easy to install and I like the new self lighting pilot. September 11, 2014
Installation was great I've only had this heater for about a week. The installation was excellent. September 11, 2014
Installation and set up was easy Read many reviews before making decision to purchase, did not run into any negative installation or set up. September 9, 2014
good good. I don't writ good in English. I am very sorry. July 16, 2014
es a great product my decision to buy whirlpool water heater,good experience in the past. May 11, 2014
This product was an exact replacement of previous GE unit. This model was almost identical to the water heater that it was replacing and had the same specifications and warranty period. I was able to use the earthquake straps that were installed 12 years ago and all connections were in the same locations, so only the exhaust vent pipe had to be shortened slightly which took a couple of minutes. The installers had no problems and the entire process took less than 3 hours, which was very cost effective. March 31, 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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