My wall heater died, I think because it's too small for the area. I'm thinking about buying Fahrenheat 3000 Watt Large Room Fan-Forced Wall Heater. The specs are: 240 Volts, 3000 Watts, 10,230 BTU/HR, 12.5 Amps My living area is about 270 sq feet. My question is, how do I know my wiring in the wall is set for 240 volts? My fuse box for the heater is 20 amps. I don't have a problem installing it myself, I just don't know by looking at the wires that it's wired for 240. Thank in advance for your help. Oh, oh, one more question, has anyone used one of these? Is it noisy? Is it a good brand? Whoops, guess that was two questions.