<p>A capillary heating device comprises a capillary tube for passing fluid, a resistive heating element (4) for heating the capillary tube, and a temperature regulation element for modifying the temperature of the capillary tube. The temperature regulation element can either be sandwiched between the resistive heating element (4) and the outer surface of the capillary tube, or wraps around the resistive heating element (4) and the capillary tube.</p>
