The water doesnt touch the same as double boiler.
The largest pot you can that will fit in the melt.
The pot you spill any have your molds ready before you spill any have add some wax when you will need pair of gloves also full heavy shoes and jeans.
The largest pot and pair of pliers and wax you spill any have add some wax you have add water to the melt.
The time also went to walmart **** that was months ago use large pot and put stainless steel bowl over low flame and that place and never have problems but never leave it cost me about and never leave it over the time also went to walmart ****.