Low water pressure whole house
Help!
I have a 20 year old home and have noticed problems with the pressure in the last two months or so. I thought that it was mostly a hot water problem, but noticed today that my upstairs toilet wouldn't flush completely or refill. It seems to be getting worse each day. Initially, we thought it might be that we're just using too much hot water and simply running out... but I suspect it's bigger than that.
I've read some of the similar postings and answers from labman and speedball1. I tried shutting off the cold water inlet to the hot water heater; opening the highest and furthest hot water tap; and opening the drain valve to see if that would free up any blockage. When I do this, do I completely run out the water heater or just do it for a short while?
Any help would be wonderful. :)