this post was submitted on 02 Mar 2025
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I know this is a joke, but usually it's caused by old cartridges. If you replace the valve cartridge then it will probably mix better. This is usually from old/bad seals. This is why new valves mix fine, but as the seals age, mixing performance gets worse.
Pulling old cartridges can be a pain in the butt so probably best to call a plumber if you don't like diy adventures.
Isnt it also a basic issue of temperature ranges?
First of all, the comfy range for humans is small and it is not even. E.g. most people will find around body temperature of 37°C nice. But 5 °C above that is burning hot, while 32°C is more lukewarm, than cold.
Then the cold water temp is probably between 10 °C and 15°C depending how long it stood. Same of the hot water temperature, where the first bit in the pipe is more like 20°C and then the boiler comes pushing 60°C in.
So the temperature range that gets mixed changes drastically in the beginning and small changes can make for a large difference in the "center" of the mixing, which is also where the comfy temperatures are.