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i have a brunham Independent boiler fairly new. it has an automatic direct water line that runs from a cold water line going in to my hot water heater. i was informed that the water level in the glass tube on the left side of the boiler should be half full, but mine is always full (pretty clean though). is this a problem? i drain a bucket of the dirty water weekly from the bottom spigot on the opposite side, but the water level stays the same. also, is it a problem that cold water enters the boiler instead of hot water ? does this lead to the sporadic clanging in the pipes i ofter hear ?