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Boss
Gas Water Heater

Model # 5-40-NKRS7 Official Boss gas water heater

Here are the diagrams and repair parts for Official Boss 5-40-NKRS7 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 27 parts  |
Water Heater Temperature And Pressure Relief Valve 9000071
#20

Round gas diagram

Water heater temperature and pressure relief valve

Part #9000071

$15.54 | 
11% OFF Phone Price : $17.54
In Stock
Anode Rod 9000705
#6

Round gas diagram

Anode rod

Part #9000705

Replaced by #100300397

?
Manufacturer substitution
This part replaces 9000705. Substitute parts can look different from the original.
$55.38 | 
10% OFF Phone Price : $61.38
In Stock
Water Heater Manifold Inner Door 9000281
#18

Round gas diagram

Water heater manifold inner door

Part #9000281

$17.69 | 
10% OFF Phone Price : $19.69
In Stock
Rexel Pan Base 9001609
#26A

Round gas diagram

Rexel pan base

Part #9001609

Replaced by #100108616

?
Manufacturer substitution
This part replaces 9001609. Substitute parts can look different from the original.
$64.44
In Stock
Heater Stand 9001422
#27A

Round gas diagram

Heater stand

Part #9001422

Replaced by #9005744005

?
Manufacturer substitution
This part replaces 9001422. Substitute parts can look different from the original.
$115.49
In Stock
Anode Rod 9000707
#21

Round gas diagram

Anode rod

Part #9000707

Replaced by #100108571

?
Manufacturer substitution
This part replaces 9000707. Substitute parts can look different from the original.
$90.00
In Stock
Water Heater Thermocouple 9000283
#14

Round gas diagram

Water heater thermocouple

Part #9000283

Replaced by #H06E-36

?
Manufacturer substitution
This part replaces 9000283. Substitute parts can look different from the original.
This item is not returnable
$14.52 | 
12% OFF Phone Price : $16.52
Back Order
Pilot 9000284
#15

Round gas diagram

Pilot

Part #9000284

Replaced by #100109070

?
Manufacturer substitution
This part replaces 9000284. Substitute parts can look different from the original.
$47.78
In Stock
Thermostat 9000246
#9

Round gas diagram

Thermostat

Part #9000246

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

Water Heater Burner 9000390
#16A

Round gas diagram

Water heater burner

Part #9000390

Replaced by #100108399

?
Manufacturer substitution
This part replaces 9000390. Substitute parts can look different from the original.
$27.78
In Stock

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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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

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