Weird, they are super common here in the Netherlands. Not expensive either. You just set it to a temperature and it’ll keep it constant.
now I want one
If I'm thinking of the same device, the one I used in Sweden and Norway, it's fantastic. It's in the shower itself, so you don't have to contend with 30m of cold pipes between a less effective water heater and the nozzle.
I can highly recommend it. Get a good name-brand one, like Grohe. Example.
Weird, they are super common here in the Netherlands. Not expensive either. You just set it to a temperature and it’ll keep it constant.
now I want one
If I'm thinking of the same device, the one I used in Sweden and Norway, it's fantastic. It's in the shower itself, so you don't have to contend with 30m of cold pipes between a less effective water heater and the nozzle.
I can highly recommend it. Get a good name-brand one, like Grohe. Example.