Haven’t had any problem with mine, or the other three that we have in the company, all with daily use. No problems with the temperature or the agitation on any of the ones we are using but there can always be dud units and 4 units isn’t a big sample size
The moccamaster doesn’t have an easily removable tank either but if you only fill up the water tank when you are about to use it the tank doesn’t really get all that dirty, maybe a fortnightly deep clean