40 Gallon Short Natural Gas Water Heater - 9 Year Warranty

40 Gallon Short Natural Gas Water Heater - 9 Year Warranty

Model: N40S91-403    Lowe's Item* #: 333562


  • 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:52.25"
Weight:132 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 - N40S91-403 4.5 5 95 95
whirlpool makes good products im never disapointed with the whirlpool products that i buy. my only ADVICE is you need to put needed components to install list <on the outside of the box>. so you dont go home and then find you have to make another trip out. frustrating....but....easy fix. thx. July 13, 2014
very safisfied with performance Installation was very quick very satisfied customer July 9, 2014
Like the pilot light ignition The step by step instructions are a great bonus. The install was easy. July 8, 2014
Great features and easy to install I am happy to chose this product. It is easy to install. good feature and look nice. June 28, 2014
Installed very easy. I had a 6 year guaranteed unit that I installed 8 years ago. It was doing fine but I decided to remove and install a 9 year unit before I had problems. June 16, 2014
Flawed design, unreliable After less than a year it suddenly stopped working. The pilot light won't stay lit. It has a 9 year warranty on parts but they are only available through mail and you have to cover the install or diy. After installing the part it still won't work. No hot water for 1 week. Turns out there is a long history of problems including a lawsuit related to the poor design of this product. Google whirlpool water heater pilot light problem. June 15, 2014
This product was easy to install. The only thing I did not like on the water heater was the plastic cheap drain valve. Just installed in May 2014, so I still need to review my energy bills. May 24, 2014
Excellent Product and Services Top quality product, great features and warranty. Would definitely recommend this product to family and friends. May 16, 2014
Reliable Water Heater It seems to be as good ad everyone says it is online. May 14, 2014
Great and Easy to install Great hot water heater with a great price. Easy to install and fit right in the place the old one sat. May 10, 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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