After install, the kitchen and only the kitchen LED lights flicker very faintly, really only irritating at night. The biggest problem is our induction stove completely changes to a much much sharper and louder pitch when the water heater is running. Sounds like arcing electricity from a low powered stun gun.No other LED lights or appliances are effected. Things to note:

-400A service

-Several LED lights and appliances are actually closer to the tankless than the kitchen is. None are effected.-Several circuits containing LED lights and appliances are closer to the tankless breakers in the electrical panel.

-The induction stoves breaker is actually in a completely separate panel from the tankless.

-Had the power company come out and confirm there wasnt harmonics and/or issues with the transformer or feed to my home. All checked out perfect.

-Individual breakers don't seem to be bad, no out of the oridinary hum from the breaker panel.

-All connections inside the breaker panel have been checked and double checked for tightness.

-Tankless unit itself has been diagnosed and confirmed to be operating inside proper volt and ohm range.

Trying to solve this before it does damage to the stove.

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Any help appreciated.