I really don't understand how this is still not the standard everywhere.. The cheapest ones aren't even that expensive and already way better than the alternative..
Don't think I've not showered with one of these in the last 25 years, except for in some kind of social housing projects homes.
When I first moved to Japan over twenty years ago they were already about a hundred years ahead of typical US toilet/bath technology. For me, using one of these faucets where you can just set the temperature by number was like Liko getting beamed from her hut directly onto the damn Enterprise.
Interesting, so it adjusts the flow of hot/cold in the fly to keep a consistent temp? That's amazing, thought I imagine it would have the same issue I have at the end of the shower where it's on 100% hot just to eke out a bit more time
Thermostatic (shower) tap. They are pretty common where I live in Europe.
They actively adjust the water mix to stabilize output temperature.
Also great for when somebody flushes the toilet or turns on a tap elsewhere in the house while you're showering.
seems like a smarter solution than what one house I lived in did of just oversizing all the plumbing and having a recirculating hot water pump (probably could help prevent freezing, but it only got to -40 once or twice there) so you could run all faucets, the washer, and the dishwasher and still have pressure at the furthest shower.
You notice the difference in flow, to be sure, so oversized piping may still be a good idea.
But the temperature shift will be soft and correct itself promptly.
Don't let that stop you getting the ultimate shower experience! My parents also have water with very high calcium at their house and I don't think they had any problems with the faucet in the past 15 years.
I live in a rented place, they were doing repairs to the heating systems, several times we had brown water coming out the tap.
I bet they installed the cheapest option, plus the debris in the water, this fucked it.
Just invest in a good thermostatic faucet and never look back !