Can’t find your part?   Contact us:
+1-309-603-4777
Sears Parts Direct
Orders

  • Keep track of the models you own in your profile

    Sign in or Register to view or add models

Schedule a repair
Rheem
Gas Water Heater

Model # 21V40T Official Rheem 40-gallon mobile home gas water heater

Here are the diagrams and repair parts for Official Rheem 21V40T 40-gallon mobile home gas 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”.

We encourage you to save the model to your profile, so it’s easy to access parts and manuals for your appliance whenever you log in.

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

Error Codes

Model diagram and schematic

SEARCH WITHIN THIS MODEL

?

This is the number corresponding to the part on the diagram / schematic

Search
ALL PARTS
Showing 10 of 13 parts  |
Burner AP-8980-B
#5

Thermostat and burner diagram

Burner

Part #AP-8980-B

Replaced by #SP8980C

?
Manufacturer substitution
This part replaces AP-8980-B. Substitute parts can look different from the original.
$37.60
In Stock
Burner AP-8980-C
#5A

Thermostat and burner diagram

Burner

Part #AP-8980-C

Replaced by #SP8980C

?
Manufacturer substitution
This part replaces AP-8980-C. Substitute parts can look different from the original.
$37.60
In Stock
Orifice, Burner (lp Gas) (red) AP-6234-B
#7A

Thermostat and burner diagram

Orifice, burner (lp gas) (red)

Part #AP-6234-B

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

Orifice, Pilot Burner (natural Gas) AP-8392-B
#8

Thermostat and burner diagram

Orifice, pilot burner (natural gas)

Part #AP-8392-B

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

Thermostat AP-9051-B
#1

Thermostat and burner diagram

Thermostat

Part #AP-9051-B

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

Anode Rod N/P

#NI

All parts diagram

Anode rod

Part #N/P

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

Owner's Manual AP-10046

#NI

All parts diagram

Owner's manual

Part #AP-10046

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

Thermocouple AP-6379-E
#6

Thermostat and burner diagram

Thermocouple

Part #AP-6379-E

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

Tube AS-35137-D
#4

Thermostat and burner diagram

Tube

Part #AS-35137-D

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

Orifice, Pilot Burner (lp Gas) (red) PA-8392-D
#8A

Thermostat and burner diagram

Orifice, pilot burner (lp gas) (red)

Part #PA-8392-D

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

Most common symptoms to help you fix your water heaters

Choose a symptom to see related water heater repairs.

View all

Why isn't my water heater heating my water?

Main causes: lack of power, no gas supply, thermostat limit switch tripped, bad element, bad thermostat, gas valve failu…

Read more

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…

Read more

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

Main causes: loose water pipe fittings, leaky drain valve, bad temperature-pressure relief valve, leaky heating element,…

Read more

Why does my hot water smell like rotten eggs?

Main causes: water supply needs chlorine treatment, anode rod too reactive…

Read more

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

Main causes: broken heating element, thermostat failure, excessive tank sediment, tank size too small, burner valve asse…

Read more

Why is my water heater making the water too hot?

Main causes: thermostat temperature set too high, thermostats need adjustment, faulty thermostat, shorted heating elemen…

Read more

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

Main causes: faulty pressure relief valve, water is overheating…

Read more

Effective articles & videos to help repair your water heaters

Use the advice and tips in these articles and videos to get the most out of your water heater.

View all
Wiring schematic symbols explained video

Wiring schematic symbols explained video

Learn some of the most common symbols found in a wiring diagram and what they mean.…

Read more
Using a wiring schematic to trace a current video

Using a wiring schematic to trace a current video

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

Read more
Easy DIY water heater repairs

Easy DIY water heater repairs

Read about some water heater repairs that you can easily do yourself.…

Read more

Parts & More