Steam produces more severe burns than boiling water.
The reason is that steam contains a significant amount of extra energy in the form of latent heat of vaporization. When steam at 100°C comes into contact with your cooler skin, it condenses into water at 100°C. In this process, it releases a large amount of latent heat, which is transferred to the skin. This extra heat transfer, in addition to the heat from the 100°C water itself, causes a much more severe burn.
Boiling water at 100°C, on the other hand, only