Allied Precision's new model 33. Not the old one that got such scathing reviews. After several nights in the teens and twenties and still ice free water for my girls, I am very pleased with my new waterer. Just fill it up, hang it up, plug it up and forget about it...well at least until it needs cleaning. My only concern is that it fills to a level very close to the top, so it is easily spilled. I have a call into them about that. Other details: It fills through a plug in the bottom, yet it can still be twisted apart like a conventional fountain for cleaning. It has a small spool underneath for storing excess cord, and a sturdy wire hoop for hanging it. Now I just have to see how it holds up over time. If it is still cooking in a month, I'm getting another one for the run. No more storing or thawing waterers in the kitchen floor for me!