Some years ago I bought one from Harbor freight. Used it twice and a plastic manifold molded into the pump broke off. Of coarse no parts available and no warranty.
Next time I needed one I spent four times as much for a bigger nicer Karcher. I was never able to get it to pull detergent from either of the 2 detergent tanks. Karcher was not interested in fixing it. Now the water sprays out of the handle soaking the operator. Yep you guessed it another junk plastic part. I need to take it apart and see if Karcher has parts. Maybe I will just adapt a metal wand assembly for a real pressure washer.
Note: neither of these failures were from freezing. They were stored in a heated garage that never freezes. Just crap plastic parts that should have been metal.