Katie- Jo, this is perfectly pitched to allow children to explore
• recognise the difference between hot and cold in terms of weather, food, water and the body
The water offers them a direct experience, and you can ask them what really hot water might look like – and how they should be careful around cooking pans etc.
I had a student once doing soldering with me at a summer camp. Despite numerous cautions that the soldering iron got really hot, he still decided to touch it. The blisters were something else! I can only think that he had no experience with hot/cold before! (he was 10!).