What Are Convection Currents?
10. Home Water Systems
In houses that still make use of boilers to heat water, convection is used to convey hot water where it is needed. When in the boiler, the water is heated, becoming less dense and expanding. The hottest water is found at the top of the cylinder, at which point an overflow pipe is connected to help regulate the pressure buildup.
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It is also the pipe that connects to the hot water tap elsewhere in the house. The pipe is arranged to descend lower than the cold water cistern so that it can provide adequate pressure for the hot water to flow out correctly.
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