I grew up in a house in the US where, when someone was taking a shower, nobody used faucets or the toilet because it would change the tempature of the shower. Scalding hot or freezing cold. It would also drop the pressure.
New houses (post 90s?) don’t have that issue. Temp and preasure stay constant. Why?
My husband says water heaters are bigger, but I think there is more to it than that because the pressure doesn’t really fluxuate, either.
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Modern shower fixtures use mixing valves that equalize temperature when there is a sudden drop in pressure of the cold water, for instance. The situation you’re describing was caused when showers used to have two individual supplies (hot and cold) and you adjusted the temperature yourself. However, when someone else “asked for” cold water somewhere else, then suddenly you are getting much more hot water, and you get burned.
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