Sometimes even new(er) valves fail. If you have hard water then that is plenty of time to mess one up. In a best case scenario, you can lookup your make/model of faucet to buy a 'cartridge' for it and find the instructions on how to replace that. In more extreme cases / poor designs, you could have to tear into the wall and replace the entire thing.
I used to live in Japan and I had an in-line gas water heater. Outside the bathroom and kitchen was a thermostat for the hot water. I just set the temp for a good shower and blasted the hot water. It was bliss. America really needs to catch up with Japan in bathroom tech in general.
Based on the sounds from my computer, that's exactly the same curve the fans on my GPU and CPU uses, except for the X axis being temperature starting from 0°C going to 100°C and Y axis being fan power in percentage.
True. But I also tested when my GPU fans would turn on and it seems like the cut-off point was 45%, below that and they'd just stop completely. And normal idle temperature is around 40°C, and with the curve on the left it makes sense that even a 5°C increase would rev the fans up from 0% to 45% making it sound like a jet fighter about to take off.
f(x)=x? In theory the water in a shower can get infinitely cold? That would be some shower that can go past absolute zero. It would be interesting to shower in a Bose-Einstein condensate.