Hot water at only one faucet
This is a very strange issue.  Do you have any shutoff valves for your cold water?  If so turn your cold water valves off so that only hot water lines can reach your fixtures.  Now run the hot water.  If no water at all comes out of your faucets clearly there is an issue and this could be a clue.  If water does come out of your faucets it eventually has to be hot.