You still can't power 2500W on a standard home circuit in the USA.  Most homes have 110v wiring, at 15A or 20A.  That puts a reasonable max of 1500W per circuit, and even that's pushing it pretty hard for a lot of homes.  You basically require 240v for a 2500W system.  Many people in the US don't have access to that, or only have that wired for the laundry room and kitchen.