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Boss
Gas Water Heater

Model # 5-40-NBRT7 Official Boss gas water heater

Here are the diagrams and repair parts for Official Boss 5-40-NBRT7 gas water heater, as well as links to manuals and error code tables, if available.

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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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ALL PARTS
Showing 10 of 33 parts  |
Water Heater Temperature And Pressure Relief Valve 9000071
#20

Functional replacement parts diagram

Water heater temperature and pressure relief valve

Part #9000071

Replaced by #9000071015

?
Manufacturer substitution
This part replaces 9000071. Substitute parts can look different from the original.
BEST SELLER
$15.26 | 
12% OFF Phone Price : $17.26
In Stock
Anode Rod 9000705
#6

Functional replacement parts diagram

Anode rod

Part #9000705

Replaced by #9003934

?
Manufacturer substitution
This part replaces 9000705. Substitute parts can look different from the original.
$52.29 | 
10% OFF Phone Price : $58.29
In Stock
Annode Rod 9000279
#21

Functional replacement parts diagram

Annode rod

Part #9000279

Replaced by #9001453

?
Manufacturer substitution
This part replaces 9000279. Substitute parts can look different from the original.
$84.66 | 
7% OFF Phone Price : $90.66
In Stock
Pilot 9000284
#15

Functional replacement parts diagram

Pilot

Part #9000284

Replaced by #9002984-15

?
Manufacturer substitution
This part replaces 9000284. Substitute parts can look different from the original.
$48.19 | 
11% OFF Phone Price : $54.19
In Stock
Access Cover 9001764
#22

Functional replacement parts diagram

Access cover

Part #9001764

This item is not returnable
$5.99
In Stock
Base Stand 9001421
#27

Functional replacement parts diagram

Base stand

Part #9001421

$62.99
In Stock
Access Bolt 9000928
#23

Functional replacement parts diagram

Access bolt

Part #9000928

This item is not returnable
$4.99
In Stock
Rexel Pan Base 9001609
#26A

Functional replacement parts diagram

Rexel pan base

Part #9001609

$77.51
In Stock
Water Heater Pilot Tube Assembly (replaces Std317025, Std317255) 9000278
#13

Functional replacement parts diagram

Water heater pilot tube assembly (replaces std317025, std317255)

Part #9000278

This item is not returnable
$17.69 | 
10% OFF Phone Price : $19.69
In Stock
Water Heater Drain Valve 9000254
#19

Functional replacement parts diagram

Water heater drain valve

Part #9000254

This item is not returnable
$17.69 | 
10% OFF Phone Price : $19.69
In Stock

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 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 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 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…

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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

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

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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.…

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Easy DIY water heater repairs

Easy DIY water heater repairs

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

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