Going to Start Carpet Cleaning Business, How is the equipment I am Choosing?

Goign to start a carpet cleaning business I am looking at a Mytee 1003dx 500psi w/Heat
or a Century 400 Ninja master 500psi with heat...

I am going to use a rotovac Wand /cleaning head on either..

question is which machine would you get?
On both machines can I not use the heater and still be able utilize a 15amp circut?

BTW, The Ninja is about $300 more than Mytee..