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Rheem
Gas Water Heater

Model # 21V40-5 Official Rheem 40-gallon efficient v gas water heater

Here are the diagrams and repair parts for Official Rheem 21V40-5 40-gallon efficient v gas water heater, as well as links to manuals and error code tables, if available.

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Error Codes

Model diagram and schematic

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ALL PARTS
Showing 10 of 19 parts  |
Anode Rod AS-35693A-C
#13

Replacement parts diagram

Anode rod

Part #AS-35693A-C

Replaced by #SP11309C

?
Manufacturer substitution
This part replaces AS-35693A-C. Substitute parts can look different from the original.
$67.96
In Stock
Orifice AP-7492-HH
#5

Replacement parts diagram

Orifice

Part #AP-7492-HH

Replaced by #AP7492HH-12

?
Manufacturer substitution
This part replaces AP-7492-HH. Substitute parts can look different from the original.
$9.63
In Stock
Burner AP-8980-B
#7

Replacement parts 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
Dip Tube AS-21064-Q
#15

Replacement parts diagram

Dip tube

Part #AS-21064-Q

Replaced by #SP11248R

?
Manufacturer substitution
This part replaces AS-21064-Q. Substitute parts can look different from the original.
$24.44
In Stock
Thermostat AP-8555-B
#1

Replacement parts diagram

Thermostat

Part #AP-8555-B

Replaced by #SP20164

?
Manufacturer substitution
This part replaces AP-8555-B. Substitute parts can look different from the original.
$166.39 | 
7% OFF Phone Price : $178.39
In Stock
Drain Valve AP-10424-B
#9

Replacement parts diagram

Drain valve

Part #AP-10424-B

Replaced by #100108605

?
Manufacturer substitution
This part replaces AP-10424-B. Substitute parts can look different from the original.
$27.78
In Stock
Door AS-29501
#11

Replacement parts diagram

Door

Part #AS-29501

Replaced by #AS29501-3

?
Manufacturer substitution
This part replaces AS-29501. Substitute parts can look different from the original.
This item is not returnable
$24.09 | 
20% OFF Phone Price : $30.09
In Stock
Brnr Sply Tb AP-8964-D
#4

Replacement parts diagram

Brnr sply tb

Part #AP-8964-D

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

Flue Baffle AS-25808-A
#12

Replacement parts diagram

Flue baffle

Part #AS-25808-A

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

Burner AS-29458A-B
#6

Replacement parts diagram

Burner

Part #AS-29458A-B

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.

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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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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 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,…

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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 making the water too hot?

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

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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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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.

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Wiring schematic symbols explained video

Wiring schematic symbols explained video

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Using a wiring schematic to trace a current video

Using a wiring schematic to trace a current video

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Easy DIY water heater repairs

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