  We present the results of a high sensitivity survey for 6.7 GHz methanol
masers towards 22 GHz water maser using the 100 m Efflesberg telescope. A total
of 89 sources were observed and 10 new methanol masers were detected. The new
detections are relatively faint with peak flux densities between 0.5 and 4.0
Jy. A nil detection rate from low-mass star forming regions enhances the
conclusion that the masers are only associated with massive star formation.
Even the faintest methanol maser in our survey, with a luminosity of 1.1
$10^{-9} L_\odot$ is associated with massive stars as inferred from its
infrared luminosity.
