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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:

  • Click a diagram to see the parts shown on that diagram.
  • 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
Anode Rod 183523-033
#9

Cabinet parts diagram

Anode rod

Part #183523-033

Replaced by #100109594

?
Manufacturer substitution
This part replaces 183523-033. Substitute parts can look different from the original.
$55.56
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
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
Relief Valve 043151-004
#10

Cabinet parts diagram

Relief valve

Part #043151-004

Replaced by #9001583015

?
Manufacturer substitution
This part replaces 043151-004. Substitute parts can look different from the original.
$29.95
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
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
Box Cover 184660-000
#20

Cabinet parts 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
Drain Valve 026273-004
#4

Cabinet parts diagram

Drain valve

Part #026273-004

Replaced by #9009086015

?
Manufacturer substitution
This part replaces 026273-004. Substitute parts can look different from the original.
$19.49
In Stock

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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 thermostat

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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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Time required
 30 minutes or less
How to replace a water heater temperature and pressure (T&P) relief valve

How to replace a water heater temperature and pressure (T&P) relief valve

Replace a broken temperature/pressure (T&P) relief valve on an electric water heater using these instructions.…

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Repair difficulty
Time required
 15 minutes or less

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Wiring schematic symbols explained video

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Find out what’s wrong with your appliance by following a circuit.…

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Easy DIY water heater repairs

Easy DIY water heater repairs

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