Vvkb Apollo GC5 Gasoline Water Heater — 5KW 12VYour gasoline tank is already on the vehicle connect the GC5 directly to it, no diesel tank required. One unit heats your cabin and preheats your engine. You don't need two separate systems. At 5KW (17,000 BTU), you heat a full size RV or campervan with the engine completely off. CE certified independently tested and approved, not self declared. Rated to 40F ( 40C) the same temperature range your engine needs protection from. No Diesel Tank. One Fuel