I did not drain mine on the Aspire nor do I on the new rig. Never an issue. My longest period of storage is probably 4 months.
Stew and Diane (and Marco)
2018 Entegra Cornerstone 45X
Formerly: 2015 Entegra Cornerstone 45B, 2013 Entegra Aspire DEQ IFS, 2004 DSDP; all sold