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 5 109 109
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
Great features Installed myself with no problems. Like the features of product. October 21, 2014
This water heater is reliable, easy to install. This is our second Whirlpool hot water heater; we expressly purchased another water heater of the same brand and type because of the extreme reliability of the product as well as the ease of installation. We are "do-it-yourselfers" and found this installation easy. Explicit instructions are there if you need them. I really like the "at-a-glance" LED light that tells you the pilot light is lit (and therefore "normal operation") as well as the diagnostic features of the LED if there is trouble. Many improvements over the previous model! The air filter skirt around the bottom is a good idea to keep bugs and cobwebs away from the burner and to maintain a good airflow, to keep the flame at its peak. A great product! October 17, 2014
Not much I can say as i've only had it installed for less then 5 days. Not differiclut to install and seems to work fine thus far. October 15, 2014
Great water Heater Very easy install, Installed same day great apperarance October 11, 2014
Product has easy operating features Product looks great,works great and has great operating features. Value a bit pricey, however purchased whirlpool water heater in past and had no problems. Installation was pretty simple. September 21, 2014
So far so good. Just installed. Just installed, but so far so good. Product has a nice appearance and seems to operate fairly quiet. Not too difficult to install, had to modify gas line and plumbing a bit, but it was replacing a 14 year old tank. Pilot light took 3 attempts to light, but had to purge air from gas line. September 9, 2014
This water heater has all +++s Design is good ,,Installation was mostly good ..except for overflow was far other side from average water heaters little more piping and time....I have mostly all whirlpool appliances and they last for years . Also on this unit It flashes lights all the time but nowhere can I find a battery nor does it say in the book. If it ever stops ??? Still Super Water Heater. Wrote this after 10 months of use All ++++s August 12, 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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