A pump (34) is configured to pressurize fluid in a microvaporizer (10). The pump includes a chamber (42) bounded by a chamber wall (43) with an inlet opening (55) configured to receive fluid and an outlet opening (57) configured to discharge fluid. The chamber has a circular cross-section. The pump further includes a rotatable impeller (44) positioned within the chamber and a shaft (46) extending through a center of the impeller. The impeller is configured to rotate around the central longitudinal axis of the shaft. In addition, the shaft is offset from the center of the chamber toward the outlet opening and away from the inlet opening so that the axis of rotation of the impeller is offset from the center of the chamber. The pump has a compact design that is able to generate the pressure differential necessary to maintain the flow of fluid and is able to react quickly to meet the demand of the user.
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