There are two types of flow, [laminar and turbulent](https://www.cfdsupport.com/OpenFOAM-Training-by-CFD-Support/node334.html). Laminar flow is nice and smooth, while turbulent flow sloshes around and is rougher. As temperature increases, flow becomes more turbulent. This causes the hot, turbulent water to loosen some of the deposits off the inside of the pipes and nozzle, which get carried out with the water.
Source: Heat Transfer professor explained why hot water is cloudy.
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