Siebring Military 401 Furnace

Exterior view of the Siebring Military 401 furnaceSIEBRING MILITARY 401

Based on the proven Military “Heatmaster Classic” design, the Military 401 will provide up to 400,000 BTU’s per hour.

Siebring Military 401 250 gallon fuel tank




The picture to the right shows the 250 gallon fuel tank which supplies filtered # 2 diesel or heating oil to the Beckett, model AFG oil burner. Fuel usage is approximately 2.75 gallons per hour.

The miliary 401 hinged shroud protects the burner, filter and plumbing from the elementsA Hinged shroud (shown left in the closed position) protects the burner, filter and plumbing from the elements.

Siebring Military 401 blower housingThe thermostat, breaker box, blower, blower motor and wiring is contained in the blower housing, protected from the elements. Included is 25 — 100 feet of wire with a plug for 120 volt, 60 Hz. A/C power.

Siebring Military 401 chimneyThe Chimney has a shield to protect the tent material from heat damage. It is installed with wing-nuts and easily removable for transport. The entire 401 assembly (shown with furnace removed) is mounted on 3/16″ steel skids and is easily transported by forklift.
Siebring Military 401 shipping and packing


  • Single stage oil pump
  • Thermostat
  • Shielded cad cell flame sensor
  • Summer fan switch
  • Flame retention burner
  • Breaker disconnect box
  • Fully guarded blower assembly
  • Energy efficient fan motor


  • All controls are wired for installation
  • Electric welded steel construction
  • Adjustable air shutter on burner for greater efficiency
  • High fuel efficiency
  • Home quiet burner

Overview of the Siebring Military 401 furnace