can someone tell me in English (not technical-ese like on the site) what this item
It says it eliminates noise off the line. Is it just for a room? for a single circuit? for a whole house? Any info is appreciated.
It is a type of surge suppression device that will also provide some isolation for noise coming from your incoming electric utility line, or other noise sources in your home. It will more than likely block X-10 and other Power Line Carrier signals also.
Since it is only rated at 1000VA(Watts), this pretty much limits it to one electronic device such as computer,TV, audio system or similar. It WILL NOT
support heavy loads such as electric heaters and such which typically draw 1500VA(Watts) or more.
To put it in prospective, Your standard duplex wall outlet is rated at 15 Amperes or roughly 1800 VA (Watts) maximum.