So I live in a duplex with one bathroom down (this has the hot water heater) and 2 bathrooms up. All the taps are single handle type.
The kitchen gets no hot water until I run the tap in the downstairs bathroom - then it gets super hot and I can't get any cold water out of the tap. This downstairs bathroom sink tap seems to control the temp for the entire house - run it cold and the rest of the house just gets hot, run it hot and everywhere else is cold. Additionally if I run the tiniest shot from the kitchen sink while the upstairs shower is running and it is scalding for a couple minutes.
Driving me nuts - and I know NOTHING about plumbing.