Espar Heater Systems offers two types of heaters, air or coolant heaters, to better suit your individual needs. Both types of heaters run on the vehicle's own diesel fuel and draw power from the vehicle's existing battery, however gasoline variant models are also available. Our AIRTRONIC air heaters draw air from the outside into a combustion chamber where a minimal amount of fuel encourages an ignition that warms the surrounding air. This system is ideal for heating the bunk in a truck or the cabin area of a boat, a coach or an RV. The HYDRONIC line of coolant heaters operates as a hot water furance, still drawing from the same energy sources as the AIRTRONIC. The combustion chamber ignites and heats the circulating coolant, which then transfers heat to the engine for a quick engine pre-heat. Espar's heaters use a minimal amount of fuel, draw a very limited amount of power from the battery and are available in many different models to suit your needs. Timers and remote key-chain starters are available, making it possible to pre-heat for up to a week in advance or remote start pre-heat on your vehicle.