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State
Electric Water Heater

Model # ES66SOMS Official State water heater

Here are the diagrams and repair parts for Official State ES66SOMS 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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Error Codes

Model diagram and schematic

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Showing 10 of 14 parts  |
2-way 9003976
#7

Water heater diagram

2-way

Part #9003976

Replaced by #9003976015

?
Manufacturer substitution
This part replaces 9003976. Substitute parts can look different from the original.
$15.49
In Stock
Box Cover 9001327
#13

Water heater diagram

Box cover

Part #9001327

Replaced by #100108548

?
Manufacturer substitution
This part replaces 9001327. Substitute parts can look different from the original.
$26.67
In Stock
2-way 9006297
#4

Water heater diagram

2-way

Part #9006297

Replaced by #100111071

?
Manufacturer substitution
This part replaces 9006297. Substitute parts can look different from the original.
$25.71
In Stock
Anode Rod 9003942
#3

Water heater diagram

Anode rod

Part #9003942

Replaced by #100109623

?
Manufacturer substitution
This part replaces 9003942. Substitute parts can look different from the original.
$61.11
In Stock
Element 9002072
#1

Water heater diagram

Element

Part #9002072

Replaced by #100108358

?
Manufacturer substitution
This part replaces 9002072. Substitute parts can look different from the original.
$31.11
In Stock
2-way 9003955
#1A

Water heater diagram

2-way

Part #9003955

Replaced by #9003955115

?
Manufacturer substitution
This part replaces 9003955. Substitute parts can look different from the original.
$36.99
In Stock
Relief Valve 9003484
#9

Water heater diagram

Relief valve

Part #9003484

Replaced by #100108279

?
Manufacturer substitution
This part replaces 9003484. Substitute parts can look different from the original.
$32.22
In Stock
Thermostat 9000509
#12

Water heater diagram

Thermostat

Part #9000509

Replaced by #100108424

?
Manufacturer substitution
This part replaces 9000509. Substitute parts can look different from the original.
$30.00
In Stock
2-way 9004330
#5

Water heater diagram

2-way

Part #9004330

Replaced by #100263839

?
Manufacturer substitution
This part replaces 9004330. Substitute parts can look different from the original.
$34.44
In Stock
Nipple 9001494
#2

Water heater diagram

Nipple

Part #9001494

Replaced by #100108578

?
Manufacturer substitution
This part replaces 9001494. Substitute parts can look different from the original.
$33.33
In Stock

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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?

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Repair guides for electric water heaters

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How to replace a water heater element

How to replace a water heater element

If your water heater runs out of hot water quickly and one of the two heating elements has failed, replace the element f…

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Repair difficulty
Time required
 30 minutes or less
How to replace an electric water heater anode rod

How to replace an electric water heater anode rod

If your hot water begins to smell like rotten eggs, replace the anode rod with a zinc-aluminum anode rod following the i…

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Repair difficulty
Time required
 15 minutes or less
How to replace an electric water heater thermostat

How to replace an electric water heater thermostat

If the water temperature fluctuates or you don't get enough hot water, follow these instructions to replace your water h…

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Repair difficulty
Time required
 30 minutes or less

Effective articles & videos to help repair your water heaters

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How to read a wiring schematic video

How to read a wiring schematic video

Learn how to decipher symbols so you can buy the right part for your problem.…

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Easy DIY water heater repairs

Easy DIY water heater repairs

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Water heater common questions

Water heater common questions

These common questions and answers can help you make the most of your water heater.…

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