XR550 heater winterization question

[euro2012]

2015 G25 XR550

Does the heater need draining to winterize or not? I’ve seen some threads mention that it does, and others that say it has antifreeze in it as part of the partial closed cooling system on that motor. This is NOT a coastal boat. So, do I blow out the heater or not? Thanks so much!

[NautiqueJeff]

My 550 heaters in previous non-Coastal boats had antifreeze in them.

Here are the drain requirements for the XR-550:

[euro2012]

Thank you sir. I have that diagram, and will be following it. Just wondering about the heater, since it is not added by pcm, I believe. Sounds like the heater is not a drain item, thanks again!