Eberspächer’s Hydronic M-II series is powerful, compact, lightweight, and rugged in design. This makes this series of heaters the ideal solution for providing engine, fuel, and hydraulic preheat for off-highway equipment as well as engine and supplemental cabin heat for motorcoaches, school buses, and boats. The Hydronic M-II series of heaters is available in one size with the option of four power levels and are diesel or bio-diesel compatible. Units can be boxed for protection against the elements and incorporate an automatic altitude compensation component, so you can use your heater anywhere with ease.