Why Does Header Tank Overflow?

Answer

There are no reliable sites showing as to why a header tank overflows. However, various blogs and forums states that it could be caused by the water in the cylinder heating up, becoming too hot and expands,overflowing out of your open vent.
Q&A Related to "Why Does Header Tank Overflow"
The tank feeds the hot water cylinder and from there the hot water goes to the mixer. the problem is that the cold water to the mixer comes from the cold water mains and it's pressure
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1. Position the 30-gallon sump directly under the pre-drilled hole in the aquarium's base pane. 2. Place a tablespoon of non-toxic silicone sealer around the 0.72-inch diameter hole
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1 Measure the amount of water required to fit between the maximum and minimum water level marks. Ad
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It has a tube between itself and the radiator. As coolant heats up, it expands. The expanding coolant goes through the tube into the overflow tank. Later, when the vehicle is shut
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