The liquefied gas regasification system are disclosed. A first heat exchanger and a liquefied gas regasification system according to one embodiment of the present invention to heat the liquefied gas and the heating medium being conveyed along the regasification line, regasification lines by screen recovering the liquefied gas supplied to the consumer in order second a heat exchanger, the first heat exchanger the first heat medium circulation line, the second heat exchanger the second heat medium circulation line and the change in volume of the heat medium is circulated along the second heat medium circulation line to the medium supply and circulation side for a heating medium supply and circulation toward to the second connection and the heat medium circulation line to the buffer includes a buffer line that is provided, the second heat medium circulation line, first to heat the heat medium pressurized by a second pump and a second pump to force the heating medium to the heat source and the heat exchange second heating comprising a group, to the heat medium heating by a second heater via a second heat exchanger to circulate a second pump, a buffer line is the second heat medium circulation line Of the heat medium may be provided, including the expansion tank is temporarily accommodated possibly provided with.