Pipe assembly for district heating network

A pipe assembly for a district heating network, comprising a first pipe, a second pipe, a heat transfer device and, surrounding the first pipe, a first insulating layer that is arranged to reduce heat transfer from the first pipe outwards in a radial direction, the first pipe being arranged for a first heat transfer medium flow, the second pipe being located outside the first insulating layer in radial direction and arranged for a second heat transfer medium flow, and the heat transfer device being arranged to transfer heat from an outer surface of the first insulating layer to the second pipe, wherein the pipe assembly further comprises a second insulating layer arranged to reduce heat transfer from the heat transfer device and the second pipe outwards in the radial direction, wherein the thermal conductivity of the heat transfer device is at least one thousand times the thermal conductivity of the first insulating layer.