These are the metal waterers that we use with our heater bases. We have purchased many on Amazon and also have seen them at our local UFA.
The large waterers are fantastic. We have had no problems with them at all. The only challenge is that you can’t fill them with water and move them as they are too heavy – you need to fill them in place.
The smaller waterers can be moved full. We have, however, found that the catch wears out too quickly. The handles also seem to wear out and detach.