In Little Alchemy 2, “Heat” is not a standalone element that can be created by combining other elements, it is a property of certain elements.
You can create heat by:
- Combining “Fire” and “Air”
- Combining “Sun” and “Metal”
- Combining “Electricity” and “Metal”
- Combining “Energy” and “Metal”
- Combining “Energy” and “Water”
And many other combinations that involve these elements, as well as other elements that can generate heat when combined.
Keep in mind that the availability of elements in Little Alchemy 2 may vary depending on the version you have and this is one possible combination to create heat. Keep experimenting with different elements and their properties to discover new combinations and items.