I had an extra heated pet bed -- the low platform kind made of hard plastic covered with a removable, washable fleece cover. I took the cover off and just set the plastic and the galvanized waterers on it. It keeps the water from freezing but does not get hot enough to melt the plastic waterer. My husband had bought a heated base for the galvanized waterer, but it clearly states NOT FOR USE WITH PLASTIC WATERERS. It may be perfectly safe, but I felt a bit uncomfortable about using it if it got THAT hot -- what if somebody kicked bedding up against it? I didn't know if it would get hot enough to cause it to burn, but didn't want to take the risk. The platform works just fine, and even in the most bitterly cold temps, the water in the drinking area had some ice in it, but was not frozen solid. You might try to find a used or inexpensive one on an online auction site, a pet supply place, or craigslist.