Step 2 · Flush the Water Heater Tank
The most common and effective solution for system-wide low hot pressure is to remove sediment buildup from the tank. First, turn off the cold water inlet valve leading into the water heater. Connect a standard garden hose to the drain valve located at the bottom of the tank. Run the other end of the hose to a floor drain or safely outside, ensuring it is positioned downhill. Open a hot water faucet in a sink or tub somewhere in the house to vent air into the system. Now, carefully open the drain valve on the water heater. The water will begin to drain. To effectively dislodge and flush out stubborn sediment, allow the tank to drain partially, then briefly open and close the cold water supply valve a few times. This creates turbulence that stirs up the sediment at the bottom of the tank. Continue draining until the water runs clear. Once clear, close the drain valve, remove the hose, fully open the cold water supply valve, and let the tank refill. You'll know it's full when water flows steadily from the hot water faucet you left open. Then, close that faucet.