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 5 117 117
loud but easy to use Having the automated pilot light system is a blessing for a natural gas novice. The heater works well and seems to not run often which is good for efficiency, however when it runs everyone in the house is going to hear the low rumble. Just a little on the noisy side and a solid value. December 7, 2014
This product was easy to install. Just replaced the old water heater. It was extremely easy to put in. Had hot water in just a little while. December 6, 2014
very easy to install very nice design, easy to see features, pilot was easy to light December 4, 2014
easy to install if u are handy it is easy to install hardest thing if u get a leak (gas or water) tightening things up December 3, 2014
Very good instructions. Easy install and start up. Hot water. The Whirlpool was competitively priced with dependable quality. Installation instructions were very helpful for the do it yourself person. November 24, 2014
Good Value The water heater was installed easily and has worked well. I have faster recovery and feel much safer than with my old model. I believe if I follow the maintenance recommendations the water heater will last many years. November 23, 2014
Good Solid product Easy to install. Love the ignition feature. First time natural gas in the house. Replaced electric water heater. Expect to save money. Only time will tell if this product is a good unit. Like other appliances, you get some that are good, and sometimes you get some tht are bad. Hope I got a good one. November 22, 2014
installation was pretty straight forward installation instructions were pretty simple. to soon to tell what impact it has on my energy bill but it is 10 gallon less so it should be less energy. November 12, 2014
Whirlpool water heater - recommended buy Same height as previous heater. 10% off at Lowe's. Get a water heater install kit with flex water and gas lines. Easy to hook up. Started within 30 sec. November 10, 2014
Needed materials I would be helpful if the materials needed for installation were included on the shipping box. Like the diameter of the black pipe (1/2 inch) November 9, 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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