Why does my Bosch tankless water heater make a terrible high pitched noise when it is on?

by Water Heaters on April 18, 2010


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    { 3 comments… read them below or add one }

    rancidcrab April 18, 2010 at 5:02 am

    Could be a couple of things, but my first gut reaction is to suggest dirty burners.

    Time for a service and clean perhaps?

    William B April 18, 2010 at 5:02 am

    probley the gas burner, a high heat burner will roar or whine when burning, or it could be the water flowing thru it,

    docksrocks April 18, 2010 at 5:02 am

    Probably a bad power ventor. Maybe dirty and a lack of combustion air.

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