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AO Smith
Electric Water Heater

Model # ECT55 Official AO Smith water heater

Here are the diagrams and repair parts for Official AO Smith ECT55 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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ALL PARTS
Showing 10 of 23 parts  |
Dip Tube 183900-052
#2

Water heater diagram

Dip tube

Part #183900-052

Replaced by #100108609

?
Manufacturer substitution
This part replaces 183900-052. Substitute parts can look different from the original.
$30.00
In Stock
Thermostat 182354-000
#13

Water heater diagram

Thermostat

Part #182354-000

Replaced by #100109846

?
Manufacturer substitution
This part replaces 182354-000. Substitute parts can look different from the original.
$53.33
In Stock
Thermostat 182359-000
#16

Water heater diagram

Thermostat

Part #182359-000

Replaced by #100110039

?
Manufacturer substitution
This part replaces 182359-000. Substitute parts can look different from the original.
$28.89
In Stock
Temperature Valve 043151-000
#10

Water heater diagram

Temperature valve

Part #043151-000

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

Bracket 184608-000
#12

Water heater diagram

Bracket

Part #184608-000

Replaced by #100108380

?
Manufacturer substitution
This part replaces 184608-000. Substitute parts can look different from the original.
$27.78
In Stock
Terminal Cover 182360-000
#11

Water heater diagram

Terminal cover

Part #182360-000

Replaced by #100109598

?
Manufacturer substitution
This part replaces 182360-000. Substitute parts can look different from the original.
$22.86
In Stock
Terminal Cover 182117-001
#15

Water heater diagram

Terminal cover

Part #182117-001

Replaced by #100110879

?
Manufacturer substitution
This part replaces 182117-001. Substitute parts can look different from the original.
$21.43
In Stock
Insulation 181639-003
#18

Water heater diagram

Insulation

Part #181639-003

Replaced by #9003971005

?
Manufacturer substitution
This part replaces 181639-003. Substitute parts can look different from the original.
$21.99
In Stock
Access Panel 181260-000
#1

Water heater diagram

Access panel

Part #181260-000

Replaced by #100109599

?
Manufacturer substitution
This part replaces 181260-000. Substitute parts can look different from the original.
$30.00
In Stock
Box Cover 184660-000
#20

Water heater diagram

Box cover

Part #184660-000

Replaced by #184660-000

?
Manufacturer substitution
This part replaces 184660-000. Substitute parts can look different from the original.
$17.99
In Stock

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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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Time required
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How to replace an electric water heater thermostat

How to replace an electric water heater thermostat

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Repair difficulty
Time required
 30 minutes or less

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Water heater common questions

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