We bought a galvanized 3 gal waterer and heating stand for underneath.
With our winters we also need to keep water from freezing.
I have seen the heated dog bowl waterers, they look very satisfactory.
That's not a bad price for your plastic heated waterer, I hope it works well for you.
I purchased that waterer last fall & used it all last winter. I really like it, and am going to be getting another one this year. It's easy to use, the plug is extremely safe (sort of embeded into the base). I was using a heated dog dish before that, but birds with long wattles dip them into the dog dish and they can then freeze. THIS waterer has a narrow drinking lip, so wattles can't dip into the water & get wet. I put mine up on a cinder block in the coop, and it stayed very clean all winter long.
Here's the same thing only cheaper. It is a hard plastic and one needs to learn to turn it back over after screwing the bottom back on after filling. I would have loved to get these instead of the metal water warmer. But I already have the metal waterers and heaters at a much higher price.
I use metal waterers and built my own heater. I used a large cookie tin (like you get as gifts at christmas) mounted a light fixture in it. Used a 75 watt bulb and it worked great. I also bought an in line thermostat used on water line heating tape for $10.00. Total spent was about $15. I simply place my metal waterer on top of the closed tin and it works great.