Inexpensive cookers like this are best to heat flower tools.

They are available at Asian grocery stores & camping shops and consist of two parts:

- cooker
- disposable butane gas canister

Uses methylated spirits
Adding a drop of water to methylated spirits prevents tools from blackening

They are available at  camping shops and consist of three parts:

- container/burner
- swivel cover to extinguish flame
- screw top sealable cover for transporting

Note:
- the burner can easily tip over
- the flame is not as hot as a gas flame
- flame is hard to see in bright lit room this can result in burns and in leaving the  room without extinguishing flame