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Posted by joe on January 18, 2010 at 08:07:03:
In Reply to: Re: Buderus OverPressure posted by HeatPro on January 10, 2010 at 12:07:04:
: Look for something that blocks off the return side from the supply side. According to pressure laws of physics, pressures will be close on all sides, other than the pressure difference across the pump.