Hi Blazerina...I'm new to posting but have been reading this board for quite some time. I'm soaking up some great information while learning to make Soy candles. Your question is something I have experience with. I had a "warmer" years ago when they were selling them to keep your coffee cup warm. I used it all of the time when I was crafting and my coffee was constantly ending up ice cold. lol I have some of the new ones from Wal-Mart and they haven't changed much. I've used ceramic, votive cups and larger glass candles without any problems. When I was testing scents in tarts I didn't want to keep cleaning out jars or votive cups so I started using tuna cans. They work great and I can have one for each scent. When the scent is gone I can toss 'em. The electric one doesn't get as hot as the one you use with tealites. I've left them on 24/7 without any problems. Hope this helps.