Brand New This unit provides for safe, reliable heating using a fuel vaporizing technology that has been tested in the laboratory and in field tests. The H-45 heater has been in service for many years and thousands of units have been put to use. The exhaust stack (included) safely vents outside all exhaust products.  The H-45 space heater is a 45K BTU heater that is designed to provide heat for the General Purpose and Temper tents. The H-45 operates without the use of electrical power and can burn many types of liquid fuel. (DF-2, DF-1, DF-A, JP-5, JP-8) The H-45 utilizes vaporizing R-tube burner technology, which overcomes the major combustion and safety problems that have existed over the past 50 years in the non-powered military heater industry. These problems include poor, smoky combustion of diesel fuel and the unsafe exposure of a pool of raw fuel during operation. The new vaporizing R-tube burner technology eliminates these deficiencies while still maintaining simplicity, ruggedness, and low cost.