Does the large campervan have heat when the engine is not running?

In select models there is a build in Heater. This is listed on the reservation page. There is also an option to get an electric heater or a small propane heater. The diesel heater in some of our large vans is controlled using a thermostat. The diesel heater uses fuel out of the vans diesel fuel tank at a rate of about a gallon every 8 to 10 hours. The electric heater does require an external 110V power source. The electric heater is a great option during the shoulder season while staying in state parks or rv parks.