Gas Tankless Water Heaters Maintenance Information

Safety Notice - This is a gas-fired water heater. Only professionals who are qualified to work on such equipment should do so. If you are in need of a qualified professional in your area, please use this contractor search page: Find A Service Provider

The maintenance steps below, and how to conduct them, are covered in the manual that came with your water heater and must be referred to prior to engaging in any work! If you no longer have a printed copy, a new one can be downloaded from this page: Gas Tankless Manuals

Maintenance Requirements

Daily (by owner)

• Ensure that no water leaks are evident around the outside of the water heater, the pressure relief valve, or from the installer-supplied plumbing connections.
• Inspect the air intake and exhaust terminations on the exterior of the home, and ensure they are unobstructed by snow, ice, shrubs, or any other material.
• Visually inspect the exterior of the water heater and the vent piping for signs of discoloration or physical damage.
  If any water leaks, discoloration or physical damage are found during visual inspection, please shut off the power, gas, and water supplies to the water heater and contact your installer or a qualified service person immediately. Do not attempt to remove the front cover yourself!

Every 400 Operation Hours Or 25,000 Cycles (qualified service person)

• Inspect and clean the inlet water filter.
• Inspect heat exchanger for soot, water leaks, or compromised seals.
• Descale the heat exchanger (especially in areas with high mineral content in the water).

Annually (qualified service person)

• Inspect exhaust venting and air intake piping for blockages or damage.
• Inspect heat exchanger for soot, water leaks, or compromised seals.
• Inspect burner for damage or blockages (see Burner Removal Video).
• Inspect the pressure relief valve for leaks and test for correct operation.
• Inspect and clean the inlet water filter.
• Inspect the condensate trap for leaks, blockages, or damage.
• Check and clean the spark/flame sensor electrodes.
• Inspect and clean the air filter that is mounted on the front of the fan.
• Descale the heat exchanger (especially in areas with high mineral content in the water).

If the inspections reveal any damaged components, they must be replaced prior to placing the water heater back into operation.

A detailed parts breakdown can be downloaded from this page: Parts Diagrams

Spare parts pricing & availability information can be found on this page: Aftermarket Resource Center

Safety Notice - This is a gas-fired water heater. Only professionals who are qualified to work on such equipment should do so. If you are in need of a qualified professional in your area, please use this contractor search page: Find A Service Provider

The maintenance steps below, and how to conduct them, are covered in the manual that came with your water heater and must be referred to prior to engaging in any work! If you no longer have a printed copy, a new one can be downloaded from this page: Gas Tankless Manuals

Maintenance Requirements

Daily (by owner)

• Ensure that no water leaks are evident around the outside of the water heater, the pressure relief valve, or from the installer-supplied plumbing connections.
• Inspect the air intake and exhaust terminations on the exterior of the home, and ensure they are unobstructed by snow, ice, shrubs, or any other material.
• Visually inspect the exterior of the water heater and the vent piping for signs of discoloration or physical damage.
  If any water leaks, discoloration or physical damage are found during visual inspection, please shut off the power, gas, and water supplies to the water heater and contact your installer or a qualified service person immediately. Do not attempt to remove the front cover yourself!

Annually (qualified service person)

• Inspect exhaust venting and air intake piping for blockages or damage.
• Inspect heat exchanger for soot, water leaks, or compromised seals.
• Inspect burner for damage or blockages.
• Inspect the pressure relief valve for leaks and test for correct operation.
• Inspect and clean the inlet water filter.
• Check and clean the spark/flame sensor electrodes. Refer to this service bulletin for directions: Electrode Cleaning And Replacement (PDF 1.5 MB).
• Inspect the condensate trap for leaks, blockages, or damage.
• Descale the heat exchanger (especially in areas with high mineral content in the water). Refer to this service bulletin for directions: Heat Exchanger Descaling (PDF 0.2 MB).

If the inspections reveal any damaged components, they must be replaced prior to placing the water heater back into operation.

A detailed parts breakdown can be downloaded from this page: Parts Diagrams

Spare parts pricing & availability information can be found on this page: Aftermarket Resource Center

Safety Notice - This is a gas-fired water heater. Only professionals who are qualified to work on such equipment should do so. If you are in need of a qualified professional in your area, please use this contractor search page: Find A Service Provider

The maintenance steps below, and how to conduct them, are covered in the manual that came with your water heater and must be referred to prior to engaging in any work! If you no longer have a printed copy, a new one can be downloaded from this page: Discontinued Gas Tankless Manuals

Maintenance Requirements

Daily (by owner)

• Ensure that no water leaks are evident around the outside of the water heater, the pressure relief valve, or from the installer-supplied plumbing connections.
• Inspect the air intake and exhaust terminations on the exterior of the home, and ensure they are unobstructed by snow, ice, shrubs, or any other material.
• Visually inspect the exterior of the water heater and the vent piping for signs of discoloration or physical damage.
  If any water leaks, discoloration or physical damage are found during visual inspection, please shut off the power, gas, and water supplies to the water heater and contact your installer or a qualified service person immediately. Do not attempt to remove the front cover yourself!

Annually (qualified service person)

• Check the exhaust venting (and air intake piping, if used) to ensure that there are no blockages or damage in the pipe or the termination.
• Check that the backdraft flapper inside the exhaust collar is moving freely.
• Check the sight glass located in the lower-right corner of the copper heat exchanger to ensure that there are no cracks in the glass or damage to its gasket. In addition, look at the burner flames through the sight glass when the water heater is running to ensure that the flames are steady and blue.
• Check and clean the spark/flame sensor electrodes. Refer to this service bulletin for directions: Cleaning The Electrodes (PDF 1.2 MB)
• Manually operate the pressure relief valve (located in the plumbing below the water heater) to ensure that it opens and water comes out.
• Ensure that the small mesh filter screen that is located inside the brass cold water connector is clean and undamaged.
• Prevent lime scale build up by carrying out a descaling flush with white vinegar. Refer to this service bulletin for directions: Descaling Heat Exchanger (PDF 1.0 MB)
• Remove the exhaust vent hood inside the water heater and inspect the top of the copper heat exchanger for soot or debris clogging up the fins.

If the inspections reveal any damaged components, they must be replaced prior to placing the water heater back into operation.

A detailed parts breakdown can be downloaded from this page: Parts Diagrams

Spare parts pricing & availability information can be found on this page: Aftermarket Resource Center

Safety Notice - This is a gas-fired water heater. Only professionals who are qualified to work on such equipment should do so. If you are in need of a qualified professional in your area, please use this contractor search page: Find A Service Provider

The maintenance steps below, and how to conduct them, are covered in the manual that came with your water heater and must be referred to prior to engaging in any work! If you no longer have a printed copy, a new one can be downloaded from this page: Discontinued Gas Tankless Manuals

Maintenance Requirements

Daily (by owner)

• Ensure that no water leaks are evident around the outside of the water heater, the pressure relief valve, or from the installer-supplied plumbing connections.
• Inspect the air intake and exhaust terminations on the exterior of the home, and ensure they are unobstructed by snow, ice, shrubs, or any other material.
• Visually inspect the exterior of the water heater and the vent piping for signs of discoloration or physical damage.
  If any water leaks, discoloration or physical damage are found during visual inspection, please shut off the power, gas, and water supplies to the water heater and contact your installer or a qualified service person immediately. Do not attempt to remove the front cover yourself!

Annually (qualified service person)

• Check the exhaust venting (and air intake piping, if used) to ensure that there are no blockages or damage in the pipe or the termination.
• Check that the backdraft flapper inside the exhaust collar is moving freely.
• Check the sight glass located in the lower-right corner of the copper heat exchanger to ensure that there are no cracks in the glass or damage to its gasket. In addition, look at the burner flames through the sight glass when the water heater is running to ensure that the flames are steady and blue.
• Check and clean the spark/flame sensor electrodes. Refer to this service bulletin for directions: Cleaning The Electrodes (PDF 1.2 MB)
• Manually operate the pressure relief valve (located in the plumbing below the water heater) to ensure that it opens and water comes out.
• Ensure that the small mesh filter screen that is located inside the brass cold water connector is clean and undamaged.
• Prevent lime scale build up by carrying out a descaling flush with white vinegar. Refer to this service bulletin for directions: Descaling Heat Exchanger (PDF 1.0 MB)
• Remove the exhaust vent hood inside the water heater and inspect the top of the copper heat exchanger for soot or debris clogging up the fins

If the inspections reveal any damaged components, they must be replaced prior to placing the water heater back into operation.

A detailed parts breakdown can be downloaded from this page: Parts Diagrams

Spare parts pricing & availability information can be found on this page: Aftermarket Resource Center

Safety Notice - This is a gas-fired water heater. Only professionals who are qualified to work on such equipment should do so. If you are in need of a qualified professional in your area, please use this contractor search page: Find A Service Provider

The maintenance steps below, and how to conduct them, are covered in the manual that came with your water heater and must be referred to prior to engaging in any work! If you no longer have a printed copy, a new one can be downloaded from this page: Discontinued Gas Tankless Manuals

Maintenance Requirements

Daily (by owner)

• Ensure that no water leaks are evident around the outside of the water heater, the pressure relief valve, or from the installer-supplied plumbing connections.
• Visually inspect the exterior of the water heater and the vent piping for signs of discoloration or physical damage.
  If any water leaks, discoloration or physical damage are found during visual inspection, please shut off the power, gas, and water supplies to the water heater and contact your installer or a qualified service person immediately. Do not attempt to remove the front cover yourself!

Annually (qualified service person)

• Inspect and clean the inlet water filter screen. Refer to this service bulletin for directions: Cleaning The Inlet Filter (PDF 0.2 MB)
• Inspect the pilot assembly for damage, and ensure correct spark and pilot flame operation.
• Inspect the burner assembly for signs of damage or debris build-up, and ensure correct burner flame operation. Refer to this service bulletin for directions: Removing & Cleaning The Burners (PDF 0.4 MB)
• Descale the heat exchanger. Refer to this service bulletin for directions: Descaling The Heat Exchanger (PDF 0.2 MB)
• HN Models Only - Clean the hydrogenerator. Refer to this service bulletin for directions: Cleaning & Replacing The Hydrogenerator (PDF 0.4 MB)

Every Two Years (qualified service person)

• Inspect the heat exchanger fins for damage, blockages, or soot build up. Clean if necessary.
• Lubricate the water valve pushrod assembly.

Every Three To Five Years (qualified service person)

• Completely rebuild the water valve (refer to manual for details).
• Clean the pilot tube and clean or replace the orifice. Refer to this service bulletin for directions: Cleaning & Replacing The Pilot Assembly (PDF 0.3 MB)

If the inspections reveal any damaged components, they must be replaced prior to placing the water heater back into operation.

A detailed parts breakdown can be downloaded from this page: Parts Diagrams

Spare parts pricing & availability information can be found on this page: Aftermarket Resource Center

Safety Notice - This is a gas-fired water heater. Only professionals who are qualified to work on such equipment should do so. If you are in need of a qualified professional in your area, please use this contractor search page: Find A Service Provider

The maintenance steps below, and how to conduct them, are covered in the manual that came with your water heater and must be referred to prior to engaging in any work! If you no longer have a printed copy, a new one can be downloaded from this page: Discontinued Gas Tankless Manuals

Maintenance Requirements

Daily (by owner)

• Ensure that no water leaks are evident around the outside of the water heater, the pressure relief valve, or from the installer-supplied plumbing connections.
• Visually inspect the exterior of the water heater and the vent piping for signs of discoloration or physical damage.
  If any water leaks, discoloration or physical damage are found during visual inspection, please shut off the power, gas, and water supplies to the water heater and contact your installer or a qualified service person immediately. Do not attempt to remove the front cover yourself!

Annually (qualified service person)

• Inspect and clean the inlet water filter screen. Refer to this service bulletin for directions: Cleaning The Inlet Filter (PDF 0.2 MB)
• Inspect the pilot assembly for damage, and ensure correct spark and pilot flame operation.
• Inspect the burner assembly for signs of damage or debris build-up, and ensure correct burner flame operation. Refer to this service bulletin for directions: Removing & Cleaning The Burners (PDF 0.4 MB)
• Descale the heat exchanger. Refer to this service bulletin for directions: Descaling The Heat Exchanger (PDF 0.2 MB)
• HN Models Only - Clean the hydrogenerator. Refer to this service bulletin for directions: Cleaning & Replacing The Hydrogenerator (PDF 0.4 MB)

Every Two Years (qualified service person)

• Inspect the heat exchanger fins for damage, blockages, or soot build up. Clean if necessary.
• Lubricate the water valve pushrod assembly.

Every Three To Five Years (qualified service person)

• Completely rebuild the water valve (refer to manual for details).
• Clean the pilot tube and clean or replace the orifice. Refer to this service bulletin for directions: Cleaning & Replacing The Pilot Assembly (PDF 0.3 MB)

If the inspections reveal any damaged components, they must be replaced prior to placing the water heater back into operation.

A detailed parts breakdown can be downloaded from this page: Parts Diagrams

Spare parts pricing & availability information can be found on this page: Aftermarket Resource Center

Safety Notice - This is a gas-fired water heater. Only professionals who are qualified to work on such equipment should do so. If you are in need of a qualified professional in your area, please use this contractor search page: Find A Service Provider

The maintenance steps below, and how to conduct them, are covered in the manual that came with your water heater and must be referred to prior to engaging in any work! If you no longer have a printed copy, a new one can be downloaded from this page: Discontinued Gas Tankless Manuals

Maintenance Requirements

Daily (by owner)

• Ensure that no water leaks are evident around the outside of the water heater, the pressure relief valve, or from the installer-supplied plumbing connections.
• Visually inspect the exterior of the water heater and the vent piping for signs of discoloration or physical damage.
  If any water leaks, discoloration or physical damage are found during visual inspection, please shut off the power, gas, and water supplies to the water heater and contact your installer or a qualified service person immediately. Do not attempt to remove the front cover yourself!

Annually (qualified service person)

• Inspect and clean the inlet water filter screen.
• Inspect the pilot assembly for damage, and ensure correct spark and pilot flame operation.
• Inspect the burner assembly for signs of damage or debris build-up, and ensure correct burner flame operation.
• Descale the heat exchanger.

Every Two Years (qualified service person)

• Inspect the heat exchanger fins for damage, blockages, or soot build up. Clean if necessary.
• Lubricate the water valve pushrod assembly.

Every Three To Five Years (qualified service person)

• Completely rebuild the water valve (refer to manual for details).
• Clean the pilot tube and clean or replace the orifice.

If the inspections reveal any damaged components, they must be replaced prior to placing the water heater back into operation.

A detailed parts breakdown can be downloaded from this page: Parts Diagrams

Spare parts pricing & availability information can be found on this page: Aftermarket Resource Center