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American Water Heaters
Gas Water Heater

Model # N40S91-403 Official American Water Heaters water heater

Here are the diagrams and repair parts for Official American Water Heaters N40S91-403 water heater, as well as links to manuals and error code tables, if available.

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  • In the search box below, enter all or part of the part number or the part’s name.

Not all parts are shown on the diagrams—those parts are labeled NI, for “not illustrated”.

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Owner’s manual
Error Codes

Model diagram and schematic

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Showing 10 of 14 parts  |
American Water Heater Water Heater Gas Valve And Temperature Control Assembly (replaces 100112336) 6911131
#10

Water heater diagram

American water heater water heater gas valve and temperature control assembly (replaces 100112336)

Part #6911131

BEST SELLER
$207.58 | 
5% OFF Phone Price : $219.58
In Stock
Water Heater Burner (replaces 3110024) 186063-000
#13A

Water heater diagram

Water heater burner (replaces 3110024)

Part #186063-000

$44.15 | 
12% OFF Phone Price : $50.15
In Stock
Water Heater Temperature And Pressure Relief Valve 6900816
#8

Water heater diagram

Water heater temperature and pressure relief valve

Part #6900816

Replaced by #100108279

?
Manufacturer substitution
This part replaces 6900816. Substitute parts can look different from the original.
$32.22
In Stock
Drain Valve 6900820
#9

Water heater diagram

Drain valve

Part #6900820

Replaced by #100108269

?
Manufacturer substitution
This part replaces 6900820. Substitute parts can look different from the original.
$18.57
In Stock
Water Heater Dip Tube 4710743
#6

Water heater diagram

Water heater dip tube

Part #4710743

Replaced by #100110924

?
Manufacturer substitution
This part replaces 4710743. Substitute parts can look different from the original.
$24.44
In Stock
Anode Rod 4700375
#7

Water heater diagram

Anode rod

Part #4700375

Replaced by #100108571

?
Manufacturer substitution
This part replaces 4700375. Substitute parts can look different from the original.
$90.00
In Stock
American Water Heaters Manifold Door And Burner Assembly 6911165
#14A

Water heater diagram

American water heaters manifold door and burner assembly

Part #6911165

Replaced by #100094002

?
Manufacturer substitution
This part replaces 6911165. Substitute parts can look different from the original.
$181.00
In Stock
Water Heater Pilot Assembly 6911143
#12

Water heater diagram

Water heater pilot assembly

Part #6911143

Replaced by #100112330

?
Manufacturer substitution
This part replaces 6911143. Substitute parts can look different from the original.
$96.67
In Stock
Draft Hood 185917-003
#1

Water heater diagram

Draft hood

Part #185917-003

The manufacturer no longer makes this part, and there's no substitute part

Outer Door 321345-000
#11

Water heater diagram

Outer door

Part #321345-000

The manufacturer no longer makes this part, and there's no substitute part

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Why is my water heater's pressure relief valve dripping water?

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Why isn't my water heater making the water hot enough?

Main causes: thermostats need adjustment, water heater capacity too low, bad heating element, thermostat failure, excess…

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Why is there water in my water heater's drain pan?

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