Aye standard households are 16 amp. You will trip that when you get to about 150-160 Amps, depending on your machine and the duty cycle. Depends really on your budget and what you're going to be using it for. Looking to use it to create stuff to sell then it's wise to invest in a good machine, something like Miller, Kemppi, Lincoln. For hobby use and mid range machine would be like R-Tech, Parweld, Thermal Arc, Everlast. Then below that you got your cheap nasty chinese crap from ebay that's horrible to weld with. That's before you get on to getting consumables such as the tungsten's, filler rods, etc. Also everyone benefits from a bench grinder as you will no doubt dunk the tungsten in the work a fair few times.