Purchased one. Had a real need for a heated larger size outside waterer. This looked like it would do the job. Sort of does. Here are my current use results and observations after a couple of weeks. Followed the directions that came with it explicitly. It is important to seal the unit as instructed using vaseline, but that doesn't guarantee water not leaking at the front edge of the bowl. 1. It may hold 5 gallons of water but will release only about three due to design so keep that in mind. The ad I read made it seem like it would have 5 useable gallons of water. The bottom two gallons or so is below the water port (an open hole in the "dish" portion. Note: the design does need to have a reservoir so the heater remains submerged at freezing temps, but it would take a 7 gallon size to get a 5 gallon use. 2. First use I had it on a perfectly level (measured to be certain) concrete surface and it let all the water run out. To keep water in I had to use two wood shims to tilt the unit higher in the front. Even that didn't work completely. I'm thinking I might need to come up with a bondable compound to put on the units water edge to keep the water from leaking continuously in some conditions (see the following). The shims do keep it at a workable angle most of the time (but it can only be shimmed a small amount to still get a water feed), but once it starts leaking it seems to continue. I use this in an outside location and while somewhat protected wind currents do get to it and cause the water to sometimes start to flow. 3. Another issue with it is it seems to be full, too little water or leaking, all on the same day with no adjustment. I am thinking one possible cause is the change in ambient temperature. On any given day, the change in ambient temperature seems to affect the vacuum level inside the canister portion which then either draws water back into the unit leaving little in the drink basin or if the sun heats it up it expands and perhaps vacuum is reduced and water pushes out the fill hole, filling the drink basin and then overflowing again. Once the leak starts it continues. Keeping it in the shade may reduce that tendency, but it is an outside waterer so it will get sunshine at my location. The rubber plug is very difficult to get into the supply hole which must be done to fill each time. It hasn't been cold enough yet to find out how the heater works and if it affects leaking, etc. Overall it works, but not as well as I wanted/expected especially related to the leaking out since even with a best seal, which if directions are followed isn't that difficult to obtain. Not sure I think it is worth the price being asked for it. Still, there is almost nothing on the market that I have seen outside of the more expensive float and valve automated waterers with connected water supplies.

I bought two of these to provide water to poultry in the winter. The lid dies not seal properly, allowing air to enter the tank, causing constant leaks. I talked with manufacturers rep several times and followed their instructions to the letter. We ended up tossing both units into the trash.