I'm experiencing a problem where I'm getting hot water out of one bathroom sink (the closest to the water heater), but luke warm water at best in all other places. I crawled under the house to follow the pipes, and I found that the branch line leading to kitchen is barely hot, whereas right before that branch on the hot water pipe, it was too hot to hold onto.
What could be causing this? Thinking it might be a pressure issue I turned off the water heater, drained the tank, refilled and reheated it, but the same problem persists. If it was just one faucet causing the problem I can see how it might be a bad mixing valve, but how is it that I just have one reliable hot tap, and the others are barely warm? We just had our water heater replaced earlier this year, so it's not even a year old. The hot line coming out of the tank is definitely hot.