Originally Posted by steve dunham
Floyd is there a check valve on the hot water side of the tank ?
There is no check valve, but there are faucet valves which Isolate the hot water lines.
When winterizing, you flush the cold water until you have "pink in the sink".
With the hot water tank drained, you simply open the hot water faucet at the sink , hold your hand over the spigot and open the cold water faucet.
This will flush the hot water lines back into the tank, clearing the lines with anti-freeze. repeat at each sink/shower.