Affiliate disclosure: Firebusters may receive a commission if you purchase through sponsored links on this page, at no additional cost to you. UNIMAC UMDHT-58 MkII 20kW Diesel Heater Guide The UNIMAC UMDHT-58 MkII is a portable forced-air combustion heater intended to produce a large amount of heat quickly in appropriately ventilated work areas. Its current published specifications include 20kW heat output, 550m³/h airflow, a 19-litre fuel tank and maximum fuel…