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

Shop NowAll products available exclusively through Lowe's Icon
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 83 83
very good product it was fairly easy to install had a plumber do it. could of done it my self but the plumber is a friend took about 11/2 hrs. thats to drain old tank and remove March 13, 2014
Easy to install; easy to light; does the job. This product was easy to install (observe the code in your area), and works as advertised. The instructions were clear and concise, better than I have come to expect lately from other manufacturers. March 4, 2014
This water heater is well made in the USA. Works fine. Plenty of hot water. Saves Gas with out pilot light. March 1, 2014
Brand New Installation was a breeze for my plummer lets hope it performs over the years to come February 17, 2014
Seems Like a Quality Produst Good product ,Fair price .A little light on the warranty. February 10, 2014
Excellent model for the price I found that installing this unit was very easy, especially with the clear directions in the installation guide. February 4, 2014
Easy to install and great features I love the electronic ignition for the pilot light. I use to use a match to light the pilot. I only had a minor problem with the gas line but was able to add a niple to make up the height difference. The flue and water pipes were lined up with no problems. I added two unions and one more shut-off value. Overall an easy installation. Seeems to heat the water very fast. February 1, 2014
this is a pretty good product I will know more in around six months of use that's all I can say right now January 21, 2014
woks but noisy, heat the water well, but as loud as an air conditioner unit when it's working. The other water heater that is over 10 years old from another company is not making any noise. January 16, 2014
Perfect for my needs I liked the compact size,fit perfect in the small area that I had avaliable.Good visibility on the pilot light monitor,can be easily seen from across the room.Easy to handle and easy to install. Recovery from extended use is 8 to10 minutes so has cut down on my fuel use considerably.I've noticed that it rarely comes on except when water is being drawn.Great machine. January 15, 2014

Owners Manual
Comprehensive information about your new appliance - from getting started to cleaning and maintenance - with answers to frequently asked questions.

You may need to install Adobe Reader  Adobe Acrobat Reader to view these documents.

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.

You may also like