Step 1 · Diagnose the Problem Scope

Begin by confirming the scope of the issue. Go to every faucet, shower, and tub in your home. Turn on the hot water and observe its pressure. Then, turn on the cold water and compare. If the hot water pressure is noticeably lower than the cold water pressure at all fixtures, the problem is systemic and likely originates at the water heater. If the problem is only at one fixture, you should first try cleaning that fixture's aerator or showerhead before proceeding with these steps.