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4. Pour tankless water heater cleaning solution into the bucket. Ensure the cleaning
solution is approved for potable water systems. Place the drain hose (D1) and hose D2
to the pump inlet in the cleaning solution.
5. Open service valves (V3 and V4) on the hot water outlet and cold water inlet lines.
6. Turn on the circulation pump. Operate the pump and allow the cleaning solution to
circulate through the water heater for at least 1 hour at a rate of 4 gallons per minute.
This will remove any possible harmful scale deposits.
7. Rinse the cleaning solution from the combination water heater as follows:
a. Remove the free end of drain hose D1 from the bucket.
b. Close service valve V4 and open shutoff valve V2.
c. Do not open shutoff valve V1.
d. Allow water to flow through the water heater for 5 minutes.
e. Close shutoff valve V2.
8. Disconnect all hoses.
9. Remove the cold water inlet filter from the water heater and clean out any residues.
10. Reinsert the filter and ensure the filter cap is securely tightened.
11. Open a hot water faucet. Run the water heater continuously for five minutes to ensure all
cleaning solution is purged from the system. Check for leaks and ensure the water heater
is operating properly.
12. Connect electrical power to the water heater.
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