NOVELTY - The tube (1) for transferring heat between a medium flowing by the tube and a medium surrounding the tube for removal of terrestrial heat for heating of biogas plant and of heating- and cooling tubes placed in building components, exhibits inner layer (11), outer protective layer (14), polymer layer and/or metallic diffusion barrier layer (12). The ratio of the tube outer diameter to the tube wall thickness is more larger than 13. The diffusion barrier layer shows a layer thickness 0.2 mm. An adhesion-promoting layer (13) is arranged between the inner layer and the diffusion barrier layer.    USE - For transferring heat between medium flowing by the heat transfer tube and a medium surrounding the tube for removal of terrestrial heat for heating of biogas plant and of heating- and cooling lines placed in building components.    ADVANTAGE - The wall of the heat transfer tube has higher thickness, so that the resistant against the crack propagation on the wall is increased. The tube increases specific heat transfer capacity.    DETAILED DESCRIPTION - The tube (1) for transferring heat between a medium flowing by the tube and a medium surrounding the tube for removal of terrestrial heat for heating of biogas plant and of heating- and cooling tubes placed in building components, exhibits inner layer (11), outer protective layer (14), polymer layer and/or metallic diffusion barrier layer (12). The ratio of the tube outer diameter to the tube wall thickness is more larger than 13. The diffusion barrier layer shows a layer thickness 0.2 mm. An adhesion-promoting layer (13) is arranged between the inner layer and the diffusion barrier layer. The tube and the outer protective layer show an adhesion-promoting layer. The tube shows an outside diameter (D) of 20 mm and a wall thickness of 1.5 mm.    DESCRIPTION OF DRAWING(S) - The figure shows a heat transfer pipe:    Heat transfer tube; (1)    Inner layer; (11)    Diffusion barrier layer; (12)    Adhesion promoting layer; (13)    Outside protective layer. (14)