Vacs used in both machines are sealed so water or moisture can pass through the motor and be vented, this is why you must run the vacs for 5 - 10 mins to clear moisture from all machines. The problem with both machines is foam. Not using defoamer or allowing foam build up will damage both machines because of turbulance. I've never had a problem, 18 months on and I have not changed a vac or pump, but if you don't run the vacs at the end of the working day they will fail on any machine. The pump motor has a large vent and there is large fan drawing heat and there is more than enough room for circulation because all the motors are not laying in a tray but mounted on a flip panel allowing a larger cooling area, as all the switches and pump controller are mounted on the top leaving a less uncluttered environment.