In the US, most people are going to want the 120V. The headings have been changed but when you go to order, they have several selections. I ordered the 240V and had to send it back, insured. I called Wisconsin Foundry and they sent me a spec sheet. All of the items listed as 6.88 amps or 4.38 amps are 240V (i.e. you probably don't want these in the US).I am reordering. This is a fairly simple set up. You pour distilled water into the bottom, then place a sterilizing rack on top. It's simple but appears functional and sturdy. It is probably a good idea to get the optional support base (item 2180) unless you are going to put it on a stainless steel or similar counter top. You have to turn it off by hand.I'm going to get this to start out with a few small surgical instruments. My previous autoclave broke and they are notoriously unreliable and expensive. My thought it, this might be enough for us. If we find that we need an autoclave, we can always get one and use this as a backup.Large capacity, can run for hours without losing water, love it.This is an effective low cost way to sterilize equipment.Medical use as autoclave for surgical pack for a busy animal hospital. Just replaced the same unit I was using for almost 12 years with out a single technical maintenance issue, aside from one replacing temp gauge.I was disappointed with the performance. For such a small sterilizer I expected it to heat up faster. Be extra careful when seating the cover as it easily becomes skewed and uneven. It was very dirty as if it had been on display and only boxed up recently.A replacement for my old one. Got it quickly. Works fine just like the old one which lasted 15 yearsExcellent product and servicevery goodThe Sterilizer seemed to be in perfect condition, other than the pressure/temperature gauge, which had a warped internal gauge. We sampled the equipment while following all of the instructions given and once it got to a certain pressure/temperature it stopped climbing. After some time at the same pressure the release valve, which was closed, started to vent. The red light then turned off. We decided to vent the sterilizer by opening the steam valve because we knew something was not right and once the steam stopped being released the pressure was still at the same reading. We then tapped the gauge and it fell down to zero. It was at this point that we realized the warped internal gauge was not giving an accurate reading. With a replacement pressure gauge, we have no doubt the machine will operate as specified.