Classic, high performance indirect oil and diesel heaters. High heat output: The machine delivers around 50 kW Equipped with double oil preheating which ensures trouble-free start-up and operation even at very low winter temperatures The combustion chamber and heat exchanger are entirely made of stainless steel for long service life and high efficiency (around 92 %) The powerful fan moves up to 4 200 m3/h, giving rapid spread of the heat. Facts are from the manufacturer's website