FIELD: underground heating systems. SUBSTANCE: system has inner guide pipe with heat insulation and outer pipe. Inner pipe is hermetic. It is made from aluminium and has inner and outer coats made from plastic layers. Joint of pipe is galvanically insulated. It includes flexible sealing rings. Pipe with heat insulation is coiled and is delivered to area of mounting. It is forced to receiving well from mounting well through ground. Material of inner pipe possesses relaxation properties in heating and cooling. EFFECT: enhanced reliability of pipe lines. 11 cl, 6 dwg
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