We did ours last month
didnt blow out the lines whereas RV antifreeze is a "pusher" and will displace water in lines.
for those of you that do blow out air 30 psi is the recommended amount starting with all taps being turned off and opening each one individually withthe WH bypassed.
dont forget the check valve in the city water connection.
Mine failed and needs to be replaced.
You ask how i know it failed...???
Ask my wife who got hit with the pink fluid while i was inside.
"NOT FUNNY" was her 2 words after slapping the side of the trailer.
I had moments earlier taken my VA hearing aids out so as not to possibly damage them.
Sorry my love...
I didn't do it on purpose
2009 Heartland Sundance 31.5 XLT bunkhouse
2013 Ford F150 XTR ECOBOOST
"Of the troops - For the troops "