Mass rate a) and kinetic power b) of the ionised outflows as a function of L_Bol. Values obtained for the WISSH quasars (red stars) are compared with other samples from literature (i.e. Harrison et al. 2012, 2014; Genzel et al. 2014; Carniani et al. 2015; Perna et al. 2015a; Brusa et al. 2016; Nesvadba et al. 2006, 2008; Rupke & Veilleux 2013). Error bars are calculated as described in Sect. 6.2. In panel a) the dotted line corresponds to the best-fit relation derived for ionised outflows and the dashed line indicates the best-fit relation to molecular outflows (see Fiore et al. 2016, for a complete discussion). In panel b) dashed, dotted, and solid lines represent an outflow kinetic power that is 10%, 1%, and 0.1% of the AGN luminosity, respectively.