| 摘要 |
A ground heater includes an insulated housing enclosing a primary fuel line within the insulation, an ambiently aspirated hollow tube running the length of the housing and extending substantially entirely through a cavity defined by an inner surface of the housing and wherein the cavity defines an opening into the housing, a torch head mounted in a torch head housing and having a fuel line thereto branched from the primary fuel line and mounted in fluid communication with an upstream end of the tube, the opposite downstream end venting to atmosphere so that a flame from the torch head extends along the interior of the tube to heat the cavity and a ground surface in registry with the opening.
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