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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

Replaced by #9000071015

?
Manufacturer substitution
This part replaces 9000071. Substitute parts can look different from the original.
BEST SELLER
$14.36 | 
12% OFF Phone Price : $16.36
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 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
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
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
Dip Tube 9001839
#5

Round gas diagram

Dip tube

Part #9001839

Replaced by #100108765

?
Manufacturer substitution
This part replaces 9001839. Substitute parts can look different from the original.
$24.29
In Stock
Water Heater Drain Valve 9000254
#19

Round gas diagram

Water heater drain valve

Part #9000254

Replaced by #100108361

?
Manufacturer substitution
This part replaces 9000254. Substitute parts can look different from the original.
$17.14
In Stock
Water Heater Pilot Tube Assembly (replaces Std317025, Std317255) 9000278
#13

Round gas diagram

Water heater pilot tube assembly (replaces std317025, std317255)

Part #9000278

Replaced by #100108370

?
Manufacturer substitution
This part replaces 9000278. Substitute parts can look different from the original.
$36.67
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
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

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