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Boss
Gas Water Heater

Model # 5-20-NKRT6 Official Boss gas water heater

Here are the diagrams and repair parts for Official Boss 5-20-NKRT6 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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ALL PARTS
Showing 10 of 29 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 9001824
#21

Round gas diagram

Anode rod

Part #9001824

Replaced by #100108260

?
Manufacturer substitution
This part replaces 9001824. Substitute parts can look different from the original.
$48.89
In Stock
Base Stand 9001421
#27

Round gas diagram

Base stand

Part #9001421

$62.99
In Stock
Baffle 9000537
Baffle

Part #9000537

$13.49
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
Thermostat 9000246
#9

Round gas diagram

Thermostat

Part #9000246

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

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
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
Drip Pan 9000741
#26

Round gas diagram

Drip pan

Part #9000741

Replaced by #9002846

?
Manufacturer substitution
This part replaces 9000741. Substitute parts can look different from the original.
$20.99
In Stock
Water Heater Thermocouple 9000283
#14

Round gas diagram

Water heater thermocouple

Part #9000283

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…

Read more

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

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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