2-year warranty NOTE: If the product is not heating properly, make sure you are pressing hot frothing button (number 4 in the user manual ) If you press number 5 it will only froth without heating . Make sure to only fill until the lower max line (there are 2 max lines ). The higher max line is only for heating without frothing . If you use the higher max line and froth it may overflow . Please do not submerge the frother in liquid.