"Stormin Mormon" wrote:

Would you give me a link to a page telling how to drain sediment
from a WH tank, when the drain faucet at the bottom is used for
the water input?

It's not rocket science... Water can flow through a pipe in either direction.
Use a T with the vertical part going into the tank. One side of the T is your
supply, the other is the drain. Inline shutoff valves on both sides.