Takagi T4 starts with cold water use

Discussion in 'Tankless Water Heater Forum' started by kd, Dec 25, 2011.

  1. kd

    kd New Member

    Messages:
    207
    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?
  2. LLigetfa

    LLigetfa DIYer, not in the trades

    Messages:
    3,933
    Location:
    NW Ontario, Canada
    I theorize there is an expansion tank somewhere absorbing the water hammer and the tankless is sensing the water movement.
  3. kd

    kd New Member

    Messages:
    207
    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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