Rotary pumps aren't that big -- most of the premium espresso machines with vibration pumps are actually bigger than the ones with rotary pumps, i.e. compare a d

Rotary pumps aren't that big -- most of the premium espresso machines with vibration pumps are actually bigger than the ones with rotary pumps, i.e. compare a dual boiler or heat exchange vibration pump like Synchronika with a Linea Micra or Lelit, with two boilers and rotary pump.