We had the Carafe model for the higher BTU offered, however the design flaw was that the grates are significantly higher from the heat source, losing energy to the air space, took longer to have water start boiling. The Profile has less BTU on biggest unit but heats up faster. Why do they not design the grates like the Carafe with round opening without the metal in the way of the fire? Overall it is an efficient cooktop for the heat we want for stir frying.