The shape of the water heating device, and the act of heating the water causes mini bubbles to form. The pressure in the pipes prevents the bubbles from coalescing.
Just because the water is 30C hotter than the cold doesn’t mean it suddenly gets bubbly. The geyser/furnace needs to impart the gas to the hot water.
Not every house the hot water is cloudy, it depends on the specific geyser/furnace/pipes.
Water out the kettle for your tea is not cloudy, no pressure to keep in the minibubbles.
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