Step 3 · Disconnect Plumbing
Place a bucket and some rags under the tank connection to catch any remaining water. Using two large pipe wrenches, place one on the tank tee manifold to hold it steady (this is the 'backup wrench'). Place the second wrench on the threaded fitting that connects the tank to the tee. Apply force in a counter-clockwise direction to loosen the tank. Once loose, you should be able to unscrew it the rest of the way by hand. Carefully move the old tank out of the way.