Trying to Drain Hot Water Heater
There might be sand, rust, or other stuff down at the bottomof the tank keeping water from flowing out easily.
It is tricky getting it clear. You could try turning off the water heater cold feed, opening a hot water faucet somewhere, and conneting a garden hose to the tank drain and try to force water in the wrong way and stir up the sand or sediment. Then take off the hose and see if the water drains back out better.
Once ou do get the water draiing, let enough out so most of the sand etc. comes out and the water runs clear.
Turn on the cold feed and make sure water is flowing from an open hot faucet somewhere before turning the burner or electricity back on.
The disadvantages of crab apple trees. In summer, the apples are too sour to pick and eat. In winter the birds come and leave dropping all over the place.