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AO Smith
Electric Water Heater

Model # ECRT66 Official AO Smith water heater

Here are the diagrams and repair parts for Official AO Smith ECRT66 water heater, as well as links to manuals and error code tables, if available.

There are a couple of ways to find the part or diagram you need:

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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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For DIY troubleshooting advice and repair guides, visit our repair help section.

Error Codes

Model diagram and schematic

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Showing 10 of 25 parts  |
Owner's Manual 184639-000
#NI

Cabinet parts diagram

Owner's manual

Part #184639-000

$9.99
In Stock
Nipple 184633-002
#8

Cabinet parts diagram

Nipple

Part #184633-002

Replaced by #100108409

?
Manufacturer substitution
This part replaces 184633-002. Substitute parts can look different from the original.
$25.71
In Stock
Bracket 184608-000
#12

Cabinet parts 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
Insulation 183256-000
#17

Cabinet parts diagram

Insulation

Part #183256-000

Replaced by #9003716005

?
Manufacturer substitution
This part replaces 183256-000. Substitute parts can look different from the original.
$23.49
In Stock
Thermostat 182354-000
#13

Cabinet parts 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
Terminal Cover 182360-000
#11

Cabinet parts 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
Access Panel 181260-000
#1

Cabinet parts 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
Element 042286-021
#14

Cabinet parts diagram

Element

Part #042286-021

Replaced by #100108283

?
Manufacturer substitution
This part replaces 042286-021. Substitute parts can look different from the original.
$27.14
In Stock
Element 042285-025
#6

Cabinet parts diagram

Element

Part #042285-025

Replaced by #100108290

?
Manufacturer substitution
This part replaces 042285-025. Substitute parts can look different from the original.
$33.33
In Stock
Terminal Cover 182117-001
#15

Cabinet parts 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

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Time required
 30 minutes or less

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