i use a eu3000..(runs at 2600Watts continous, 3000 watt peak). I run a hot water heater and a full size fridge, all my lighting, stereo, computer, xbox and flat screen and the FE100. if the hot water heater is not actually cycled on and heating, the unit spends most of its time on idle... and It sips gas.,...I get thru an entire weekend with a little over 5 gallons. If i need to run the Air conditioning, i shut off the hot water heater. All else keeps running.
2 EU2000s hooked together will give more power, but use more fuel and you will need the external tank adapter. 2 units and the parrallel kit will run more $$$ that one eu3000.
the champion line has 2000 watt inverters that can be paralleled and will push 3200W tied together,