Eberspacher / Espar Hydronic II 16 kW (24v) Heater HL2-16. The Espar Hydronic L16 16KW diesel heater is sure to keep the passenger area warm, the engine preheated and ready, and your hydraulic liquid flowing smoothly. The Hydronic L16-L35 range of heating systems is tailored for larger vehicles and marine applications in colder climates.