Model # 5-40-NKRT8-42 Official Rexel United gas water heater

Here are the diagrams and repair parts for Official Rexel United 5-40-NKRT8-42 gas water heater, as well as links to manuals and error code tables, if available.

There are a couple of ways to find the part or diagram you need:

Click a diagram to see the parts shown on that diagram.
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”.

We encourage you to save the model to your profile, so it’s easy to access parts and manuals for your appliance whenever you log in.

For DIY troubleshooting advice and repair guides, visit our repair help section.

Error Codes

Model diagram and schematic

SEARCH WITHIN THIS MODEL

ALL PARTS

Showing 10 of 17 parts |

Replacement parts diagram

Nipple

Part #9000415

Replaced by #100108409

$25.71

In Stock

Qty

Replacement parts diagram

Thermostat

Part #9000249

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

#27A

Replacement parts diagram

Heater stand

Part #9001422

Replaced by #9005744005

$115.49

In Stock

Qty

#16A

Replacement parts diagram

Water heater burner

Part #9000390

Replaced by #100108399

$27.78

In Stock

Qty

#26A

Replacement parts diagram

Rexel pan base

Part #9001609

Replaced by #100108616

$64.44

In Stock

Qty

Water Heater Manifold Inner Door 9000281

#18

Replacement parts diagram

Water heater manifold inner door

Part #9000281

Replaced by #100108371

$30.00

In Stock

Qty

#10

Replacement parts diagram

Manifold

Part #9000358

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

Replacement parts diagram

Draft hood

Part #9000273

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

Flue baffle

Part #9000516

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

#16

Replacement parts diagram

Burner

Part #9000288

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.

View all

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…

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,…

Why does my hot water smell like rotten eggs?

Main causes: water supply needs chlorine treatment, anode rod too reactive…

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…

Why is my water heater's pressure relief valve dripping water?

Main causes: faulty pressure relief valve, water is overheating…

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…

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…

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.

View all

Model # 5-40-NKRT8-42 Official Rexel United gas water heater

Model diagram and schematic

SEARCH WITHIN THIS MODEL

Most common symptoms to help you fix your water heaters

Why isn't my water heater heating my water?

Why is there water in my water heater's drain pan?

Why does my hot water smell like rotten eggs?

Why isn't my water heater making enough hot water?

Why is my water heater's pressure relief valve dripping water?

Why isn't my water heater making the water hot enough?

Why is my water heater making the water too hot?

Effective articles & videos to help repair your water heaters

How to read a wiring schematic video

Easy DIY water heater repairs

Water heater common questions

Parts & More

Stay Connected

Quick links

Let us help you

More resources