The heat source? A Truma VarioHeat 11,500-BTU heater that’s built into the Wooly. An internal 21-gallon freshwater tank and the lines leading to it are also insulated to prevent freezing up ...

In addition to the heating power of the Truma VarioHeat, the E-Kit provides another 1800 W. There are two individual heating coils that can be used independently for 900 W of additional heating, or ...