Takagi T4 starts with cold water use

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KD

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My new Takagi starts running and heating water when I turn off the cold water, like the garden hose. I installed a backflow preventer gravity valve then a spring type valve on the cold side feeding into the Takagi. Both did nothing. If I turn off the cold water slowly...there is no problem. The water pressure is 85 psi. How can I prevent it from coming on uselessly?
 

LLigetfa

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I theorize there is an expansion tank somewhere absorbing the water hammer and the tankless is sensing the water movement.
 

KD

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There is no expansion tank unless there is one inside the Takagi. I was thinking of installing one to reduce the abruptness when the water is shut off. Also I was thinking I could reduce the pressure to 50 lbs with a pressure valve, or is 85 psi OK?
 
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