This is how I winterize my rig;
Turn off pump & disconnect one leg to water pump to prevent pump from running if turned on.
Open three drain valves located in basement.
Open both H&C on outside faucet
Open drain & expansion valve on HWH
Open ALL faucets in kitchen & bathroom
Pour about a cup of the "pink Stuff" in ALL drain traps
Done
No need to blow out any lines. Drain valves located low and all water drained. Been doing above for about 10 years here in New Hampshire w/o any issues.
No cracked valves found when getting ready for the season.
