A furnace for small-angle neutron scattering on samples heated from room temperature to 1500°C was constructed and is now available on the SANS instrument at the spallation source SINQ of the Paul Scherrer Institut in Villigen, Switzerland. Solid solution treatments and quick temperature steps are feasible combined with a motorized positioning system to precisely adjust the sample. The furnace works under high vacuum (better than 10−4mbar) or under controlled atmosphere. Special measures were taken to reduce parasitic scattering from the sample environment. Remote control when installed on the instrument as well as stand-alone operation for calibration and test purposes are feasible. Results of small-angle neutron scattering experiments on a polycrystal and a single crystal of Ni–11.3at% Ti aged in situ at 600°C for up to 100h are presented.