Yeah, if you don't heat, then you have to drain the lines. I'd pour a cup of RV anti-freeze down each drain as well (sink, tub & shower), drain the toilet tank & bowl, and put a cup of anti-freeze in the bowl as well.

If it's going to be below freezing for a while, and you'll be gone for a while, you might have to drain the bladder tank & water softener as well.

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3/4 to 1 1/4 ac pond LMB, SMB, PS, BG, RES, CC, YP, Bardello BG, (RBT & Blue Tilapia - seasonal).