No I can't find any that just produce heat. Maybe I'm looking at the wrong place. What heat source would everyone else suggest? She is in a 55 gallon and has a under tank heater, a reptile tube lighting stick thing ( I have no Idea what they are called) and another heat light. What heat source and or wattage on ceramic heater (I know some people don't like them) should I use? Any suggestions I would love to hear!