If you are running the Alex off the water tank the power to the pump is cut when the water runs low. Water runs low, lights go out, no power to pump, no power to heater, and alarm goes off.
As far as using this machine for catering goes, I would not recommend it. You need something more powerful. My choice for 110 volt single group machine for catering is the Nuova Simonelli Appia.
I will post and image in a little while. But you can view the Appia here:
http://www.chriscoffee.com/products/home/espresso/appiaauto1group
We do catering for our restaurant customers if they have a wedding or an event that ask for a coffee station. We provide everything from the machine and coffee to the Barista. At a wedding or an event every body wants coffee the last hour, you get slammed all at once. I personally used the Appia at an event for the C. I. A., Culinary Institute of America, held at Albany Country Club this past summer. It was a fund raiser and there were over 400 people there. The last hour we got slammed, I just keep steaming milk and pouring while my sales manager pulled shots for more than an hour straight. The machine did not have time to breath neither did we and the Appia never skipped a beat, it never ran low on steam power. The machine made steam as fast as I could use it. There is no way Alex could do that.
The post here simply asked if they could disconnect it and take it with them. No problem, I though he was referring to taking it to his mother's house for Christmas or some other special occasion.