On another Jessie host I have a USB Epson scanner that works via iscan backend. Saned works fine on this host. To summarize what cases I have at hand:
scanimage > iscan > USB > Epson device - works scanimage > netwrok > saned > iscan > USB > Epson device - works scanimage > hplip > network > HP device - works scanimage > network > saned > hplip > network > HP device - does not work
