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loud rumble upon startup of bosch 250sx water heater

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p smith
p smith Member Posts: 1
in THE MAIN WALL
what causes the loud rumble upon startup of a bosch 250sx water heater. I have proper gas pressure and have checked the intake and exhaust venting. I checked the co levels and they were as specified by bosch. It happens every time the heater starts.

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  • chris_95
    chris_95 Member Posts: 47
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    I have an Omega OME620, and it does the same thing. Super loud on startup, rattles the wall for a minute, then usually quiets depending upon flow. Mfg. says a few percent of his units do this, but doesn't effect performance - i.e., I'm SOL. I will probably pull it apart and add vibration dampers and support brackets in the unit. The thing works well other than the DEAFENING NOISE, and the usual tankless considerations - extra 15 seconds, cold water sandwich, etc.
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