Low water pressure throughout your home immediately after flushing your water heater is almost always caused by sediment, calcium scale, or pipe debris dislodging and traveling downstream to clog your faucet aerators, showerheads, or inlet valves. When you drain and flush a water heater tank, accumulated mineral deposits can break free and get swept into your household plumbing lines when the system is refilled and pressurized. Additionally, if you did not fully reopen the cold water supply valve feeding the water heater or the main hot water outlet valve, flow will remain restricted. Verification: Unscrew and inspect faucet aerators and showerheads to clear out trapped sediment, and verify that all water heater valves are turned fully open.
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