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Thermar
Gas Water Heater

Model # PM1000LP Official Thermar tankless water heater

Here are the diagrams and repair parts for Official Thermar PM1000LP tankless water heater, as well as links to manuals and error code tables, if available.

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Error Codes

Model diagram and schematic

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ALL PARTS
Showing 10 of 39 parts  |
O-ring 239-37366-00
#6

Replacement parts diagram

O-ring

Part #239-37366-00

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

Buter Case PM-12
#8

Replacement parts diagram

Buter case

Part #PM-12

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

Chassis Assembly 239-37382-00
#1

Replacement parts diagram

Chassis assembly

Part #239-37382-00

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

Igniter 239-37337-00
#30

Replacement parts diagram

Igniter

Part #239-37337-00

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

Gasket 239-37368-00
#16

Replacement parts diagram

Gasket

Part #239-37368-00

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

Thermocouple 239-37326-00
#13

Replacement parts diagram

Thermocouple

Part #239-37326-00

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

Housing Assembly 239-37320-00
#18

Replacement parts diagram

Housing assembly

Part #239-37320-00

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

Ht Exch Assy 239-37373-00
#3

Replacement parts diagram

Ht exch assy

Part #239-37373-00

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

Eco Assy 239-37317-00
#20

Replacement parts diagram

Eco assy

Part #239-37317-00

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

Sensing Tube 239-37332-00
#25

Replacement parts diagram

Sensing tube

Part #239-37332-00

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

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 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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