Step 3 · Inspect and Clean the Hot Water Outlet Nipple
If flushing the tank did not restore pressure, the blockage might be located in the hot water outlet nipple on top of the tank itself. These nipples, especially heat-trap models, can corrode and clog with sediment. Ensure the water pressure is off. Place a bucket and towels under the connection to catch water. Using two pipe wrenches—one to hold the nipple stationary to prevent it from breaking off, and the other to turn the flexible connector nut—carefully disconnect the hot water line from the heater. Look inside the nipple. You may see a small plastic ball or flap (a heat trap) or a thick buildup of mineral scale. Use a narrow screwdriver or a piece of stiff wire to carefully break up and clean out the obstruction. Once clear, wrap the male threads of the nipple with new Teflon tape in a clockwise direction 3-4 times. Reconnect the hot water line, using the two-wrench method to tighten it securely without over-tightening.