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 5 134 134
Can't go wrong for the price Looks good, works good ,easy to install, well written instructions April 20, 2015
great features simple to operate, heats up fast, installed pretty simply just like any other heater, pop off valve was bad, but the new one was ten bucks and we were in business April 13, 2015
So far so good Easy to install. Installed 02/2015. So far no problems. Pilot light first try. Hot water is more than you will need for family of 4-5. Hope it lasts as long as 9 YR Warranty. I`ll update any problems. This is an excellent unit. April 2, 2015
Easy install Was an easy replacement install, only needed help from 2 young men for removal of 5 year old Rheem which failed and placement of new one in attic. Seems like a better tank with push button igniter and led readout. Now, time will tell the story if it is any better than the Rheem. March 27, 2015
Looks nice. My plumber has said that the water heater is quite good and I believed him. The old one being changed was made by A.O Smith Water Heater and it lasted for over 9 years. I am sure that your product will be better. March 27, 2015
This is a good looking produce and it produces plenty of hot water. I am pleased with this water heater! Yes, I will reccommend this to my family and friends March 26, 2015
Good product for the price. Cheaper than Menard or Home Depot, but I had to order this short water heater and it took almost 3 weeks to get it in. Fortunately, I wasn't in a hurry. March 21, 2015
I like the feature of polit light being lit Easy to install and to light the pilot light, just bought, and just installed it. so far so good February 28, 2015
Oustanding unit! The unit was easily installed by my contractor. It fired up and fully operational after installation. The only drawback was the unit didn't came in with 'dielectric nipple' to connect the unit to the water lines... costs about $12.00. According to my contractor, other waterheater brands comes with it but not with Whirlpool. Luckily I read the reviews and prepared myself by buying one prior to having it installed. Most of the consumers are NOT aware of these missing items. I recommend Whirlpool company to include these items with their units that they are selling or at least have that information readily available to the consumers. This will prevent multiple trips to the hardware store and work stoppage on the contractor. February 26, 2015
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

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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