If you are looking for a vapor steam cleaner invest a little extra money and buy one that is high quality. If you read read the reviews on many of the handheld units seen on tv you will find that by the time the steam reaches the surface it is not hot enough to do much good.
You will find most steam cleaners don't even tell you the steam temperature that they generate. The temperature of the steam and the pressure are two very important points to consider when comparing vapor steam cleaners. Some will advertise the temperature the water is heated to and others may tell you the temperature at the tip. The heated water temperature will always be higher than the heat at the tip.