TM 9-4520-257-12&P 0003 00
OPERATOR AND UNIT MAINTENANCE
H-45 LARGE RADIANT SPACE HEATER
(TYPE I, SOLID FUEL)
(TYPE II, LIQUID FUEL)
THEORY OF OPERATION
The H-45 Large Radiant Space Heaters are designed to be operated by one soldier; however it may take
two or more soldiers to assemble and tie down the stack assembly. The H-45 Type I (Solid Fuel) Heater
is designed to use wood or coal for fuel. The H-45 Type II (Liquid Fuel) Heaters can be fueled by JP-8;
DF-A, DF-1, or DF-2; JP-5; kerosene; Jet A-1; Jet A; gasoline (emergency only); and JP-4 (emergency
only). Safe operation of the heaters requires adherence to all operating instructions and careful
monitoring of the heaters during operation. Both Type I (Solid Fuel) and Type II (Liquid Fuel) combustion
gases are exhausted out of the roof of the shelter.
SOLID FUEL OPERATION
Do not overfill the heater when using coal or wood as a solid fuel. Coal is
very dense and produces a very high heat output. Using too much coal or
wood in the heater will over fire the unit and make it very difficult to
control the heat output.
For the H-45 Type I (Solid Fuel) Heater, paper and kindling (such as small pieces of wood) are laid on the
grate (1). When the kindling is burning, wood or coal is added. Heat output is regulated by the amount of
fuel placed in the heater, by opening or closing the front and back base heater doors (2) in the bottom of
the heater body base (3), and by adjusting the flue damper (4) in the stack pipe (5).
Combustion gases flow up the stack pipe (5), through the stack cap assembly (6), to the outside of the