The invention relates to an exhauster which comprises a pump and a conduit. The pump is provided with a groove body, and the groove body is provided with a first air inlet, a second air inlet and an exhaust opening. The conduit is provided with a first end section, a second end section and a heat exchange section connected between the first end section and the second end section, wherein the heat exchange section contacts the outer wall of the groove body, and the second end section is connected to the second air inlet. Gas can introduced into the groove body through the conduit, and the gas in the conduit can be heated by utilizing the heat energy of the groove body.