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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.

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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 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, 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

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

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

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 (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

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

Orifice AP-6234-C
#7

Thermostat and burner diagram

Orifice

Part #AP-6234-C

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

Most common symptoms to help you fix your water heaters

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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…

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

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Why does my hot water smell like rotten eggs?

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

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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…

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

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

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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…

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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…

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