well thank you all for the feedback,
but i abandoned the project, my client disappeared, i didn`t get payed

so...
as for the materials for the stove he asked for those dull metals that exact type of flame.
@Odeas
the flame was made with an opacity map on a curved plane, as for the heat distortion i have no clue how to achieve that in octane
@Nichod
that is a good idea but i`m not going to work on this project anymore

if the client will pop up at my door with the money in his hand maybe i will finish he`s stove.
Best regards,
Tudor