50 Gallon Tall Ultra Low NOx Natural Gas Water Heater - 9 Year Warranty

50 Gallon Tall Ultra Low NOx Natural Gas Water Heater - 9 Year Warranty

Model: NU50T91-403    Lowe's Item* #: 333572


  • 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 natural gas model meets 10ng/J emissions standards

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Product Dimensions
Height w/Draft Hood:61.25"
Weight:151 lbs.
Vent Type:Type B Double Wall
Vent Diameter:3"
Configuration and Overview
Capacity:50 Gallons
Family Size:5+
Energy Star Certified:No
Energy Factor:0.58
Annual Cost of Operations:$282
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: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:0.58
Ultra Low NOx:Meets SCAQMD Rule 1121
50 Gallon Natural Gas Water Heater - NU50T91-403 4.5 5 41 41
Installed today. So far so good Easily installed. No problems. We'll see how it goes when we start running appliances and taking showers at the same time. We should be OK (we hope). April 6, 2015
Average product Product was recommended by a friend, the store staff was fairly helpful in explaining the features. I was surprised to hear that the only difference between the 6 and 9 and 12 year warranty products was the warranty itself. March 19, 2015
Big machine to install through a Hobbit Hole Needed more hot water so we upgraded to 50 gallons from aging 40 gallon heater. Other than attic access through an upstairs closet, the heater installation went without issue. Pilot ignition came on quickly and unit is functioning well. Ready to enjoy a long hot shower. March 15, 2015
Great unit so far!! It will be 3 months in 10 days so I only have 2 months & 20 day to judge if this unit is a good one or a piece of junk.I can say it installed with no problems,Fired it up & had enough hot water in less than an hour for bath & shower. Previous unit lasted 28 years. So this unit has a ways to go before I can rate it higher. February 16, 2015
Good value for the money I feel that this is a first class product from a first class company. February 16, 2015
Made in the USA I bought this product because of the Whirlpool name and most importantly because it is made in the USA. Installed just like any other water heater, the control panel makes it easy to light. January 4, 2015
thisproductbestfeature i was using this product 40 gallon waterheatersince last10earswithou any problemandalsovery easy to handel istallatin i hopethisnew product willlast15 years whithout any problem like lastone November 26, 2014
Very quiet Compared to my old water heater this model is very quiet. September 29, 2014
NA Easy to Install If you want people to do this survey, I suggest you remove the minimum text requirement! July 21, 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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