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 5 125 125
Great product Easy to install. Easy to light. No more matches. Since installation I have not ran out of hot water even with 6 people taking showers all in 1 morning. February 22, 2015
So far, so good. Just installed today. Installatin was easy. First tank of cold water heated properly and rapidly. No complaints so far. January 30, 2015
works great water heater was easy to install.works great.water can get very hot if you want. January 26, 2015
good product good product whirlpool water heaters are a good buy. this is my 2 nd whiripool hearer the last one was 6 year. last for over 8yrs. January 13, 2015
This product had what we were looking for. This was just installed. It was very easy to install. I t was very easy to light. great system light the pilot. we will have wait and see on the durability and how long it lasts. The water is nice and hot. It has multiple setting for your comfort level. it also has a vacation setting. January 4, 2015
replacement of the same water heater Simple installation and I expect it to provide as good a service as the one before it. I am satisfied with my purchase. December 30, 2014
Excellent so far Just installed. Takes about one hour to bring water up to temperature of approx. 127 F Will come back in six months to futher expand on review. Had profressionaly installed so have install warranty along with item warranty. Hope I don't have to use. December 29, 2014
The controll unit makes this unit easy to operate I like the unit very much my problem is that it did not have the Dielectictric fiitings installed as most tanks have when purchased. My other issue is a filter that in most cases will be totally forgotten about the units are getting far to sensative. December 21, 2014
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

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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