Gas Tankless Water Heaters Maintenance Information

Greentherm 9000 (All Models) Tankless Water Heaters

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