Espar is one of the most trusted names in diesel-fired parking heaters for commercial trucks, producing bunk heaters and cab heaters that keep sleeper cabs warm through cold nights without idling the main engine. Their Airtronic and Hydronic heater lines are widely used by OTR drivers and fleets operating in cold climates, providing efficient, reliable heat at a fraction of the fuel cost of engine idling. Shop Espar bunk heater systems and service parts for your Peterbilt sleeper.