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In many people’s homes, scaling accumulates in the hot water tank more so than the hot water line. That means that it’s easier to get hot water through than cold water, and even though you have high cold flow, you probably have low cold pressure. Thrusting high pressure hot water in prevents cold water from flowing, sometimes altogether. Thus, you end up needing to close the valve enough so there’s also a sufficient pressure drop across the valve so they balance out what’s comfortable for you, except the valve design is more for flow control, not pressure control. E.g. 10% open = 10% flow. 40% open = 40% flow.
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