Looks like what we refer to as a portable steam table. I believe I have seen pictures of people using those, maybe DeeJayDebi. I know I've seen them in books.
They are designed (the ones I've seen here in the States) to keep food above 140°F (60°C). I don't know if they would be capable of heating to boiling temperatures (e.g., for recooked cheeses like Ricotta). I'd especially want to know how accurately a particular model could control temperature at lower heat levels. Is the temperature regulation based on a direct measurement of the temperature of the food in the pan? Does it have very low settings like 88°F (31°C)?
EDIT: I see you listed the temperature range. My question (to the manufacturer, perhaps) would be to what degree of accuracy.