I have pretty good draining my Hotwater Heater by opening the HOT Water side of the spigot and then opening the fresh water low drain point value..
We do alot of camping off the grid and up late into the season... Can do the low drain points and get all the water out of the fresh water tank and most of the water out of the hot water heater doing this... then we just blow out the water lines with our small compressor adapted to the city water port. Then add some pink stuff to the P-traps. Good to go for the night. Then the next morning just add water to the fresh water tank and ready to go again...
There is alot of space in the hot water heater so freezing some water is not a problem for us...
I do pull the sacrificial anode at the end of the season and check it for replacement if needed. That is when I flush out my hot water completely... My Hot water heater is the Suburban model...
Roy and Carolyn
I claim Horse Creek Country in Southern Ill - Momabear is from North Texas
We live in King George VA
RETIRED DOD DOAF DON CONTRACTOR Electronics Tech 42YRS
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