Old water heater which was never inspected started leaking from the bottom and was replaced New water heater appears to provide much lower hot water pressure nearly everywhere. Not only that, probably when no one else was using anything, I have one observed the water pressure suddenly jump up while I was using it on the first floor. It could have been the washer in the basement stopping, but anyway. The thing is that the hot water pressure in the sink right next to the water heater in the basement seems to have gone up vs before. The most common solutions proposed are blockages, however it's highly unlikely that the day after a 100% new and modern water heater was installed that pipes got blocked. Unclear how to resolve the issue. Some more information: In the 1st floor, there's a kitchen sink head which used to have a function that sprayed the water, but required a certain amount of constant pressure to maintain that setting. Now, it will never work because of low pressure. We unscrewed the head and the hot water pressure seemed to be very significant. I don't know if that's normal or not.