Our direct-fired heaters set up quickly and are exceptionally quiet during operation. They have a direct spark ignition system, a thermostatic control and some are ductable. Available in propane or natural gas.Used in well ventilated applications requiring a lot of heat.Offered in sizes ranging from 80, 000 Btuh to 1, 000, 000 Btuh.Generate the lowest cost per Btu of heating when compared to indirect-fired and electric heaters.Achieve very high temperature rises.