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Boss
Water Heater

Model # 1-40-1HMS7 Official Boss electric water heater

Here are the diagrams and repair parts for Official Boss 1-40-1HMS7 electric 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.

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Error Codes

Model diagram and schematic

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ALL PARTS
Showing 10 of 17 parts  |
Water Heater Heating Element Gasket 9000308
#6

Replacement parts diagram

Water heater heating element gasket

Part #9000308

Replaced by #9000308005

?
Manufacturer substitution
This part replaces 9000308. Substitute parts can look different from the original.
$30.62
| 
16% OFF Phone Price : $36.62
In Stock
Water Heater Thermostat Bracket (replaces 0110238, 0110238-01, 0110322, 9000309015) 9000309
#7

Replacement parts diagram

Water heater thermostat bracket (replaces 0110238, 0110238-01, 0110322, 9000309015)

Part #9000309

Replaced by #100108380

?
Manufacturer substitution
This part replaces 9000309. Substitute parts can look different from the original.
$27.78
In Stock
Nipple 9000453
#2

Replacement parts diagram

Nipple

Part #9000453

Replaced by #100108385

?
Manufacturer substitution
This part replaces 9000453. Substitute parts can look different from the original.
$31.11
In Stock
Drain Pan 9000743
#19B

Replacement parts diagram

Drain pan

Part #9000743

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

Nipple 9000327
#3

Replacement parts diagram

Nipple

Part #9000327

Replaced by #9002564

?
Manufacturer substitution
This part replaces 9000327. Substitute parts can look different from the original.
$19.19
| 
9% OFF Phone Price : $21.19
In Stock
Water Heater On/off Switch, 120-volt (replaces 9000767) 9000340
#15

Replacement parts diagram

Water heater on/off switch, 120-volt (replaces 9000767)

Part #9000340

Replaced by #100108389

?
Manufacturer substitution
This part replaces 9000340. Substitute parts can look different from the original.
$35.56
In Stock
Box Cover 9001327
#4

Replacement parts diagram

Box cover

Part #9001327

Replaced by #100108548

?
Manufacturer substitution
This part replaces 9001327. Substitute parts can look different from the original.
$26.67
In Stock
Rexel Pan Base 9001609
#19A

Replacement parts 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
Thermostat 9000508
#10

Replacement parts diagram

Thermostat

Part #9000508

Replaced by #100108424

?
Manufacturer substitution
This part replaces 9000508. Substitute parts can look different from the original.
$30.00
In Stock
Drain 9000058
#18

Replacement parts diagram

Drain

Part #9000058

Replaced by #100108269

?
Manufacturer substitution
This part replaces 9000058. Substitute parts can look different from the original.
$18.57
In Stock

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...

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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's pressure relief valve dripping water?

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

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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 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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Repair guides for electric water heaters

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How to replace a water heater element

How to replace a water heater element

If your water heater runs out of hot water quickly and one of the two heating elements has failed, replace the element f...

Read more
Repair difficulty
Time required
30 minutes or less
How to replace an electric water heater anode rod

How to replace an electric water heater anode rod

If your hot water begins to smell like rotten eggs, replace the anode rod with a zinc-aluminum anode rod following the i...

Read more
Repair difficulty
Time required
15 minutes or less
How to replace an electric water heater thermostat

How to replace an electric water heater thermostat

If the water temperature fluctuates or you don't get enough hot water, follow these instructions to replace your water h...

Read more
Repair difficulty
Time required
30 minutes or less

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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How to read a wiring schematic video

How to read a wiring schematic video

Learn how to decipher symbols so you can buy the right part for your problem....

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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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Water heater common questions

Water heater common questions

These common questions and answers can help you make the most of your water heater....

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