I have recently switched over to a 2 burner setup. I have 2 burners setup in series. I had anticipated problems. Unprecedentedly it worked much better than one large burner. Before the temp would very greatly. Now instead of getting up to the steam level and then cooling down greatly the temp seems to stay much closer to the optimum level. This optimum temp works much much better over all, and exceptionally well at degreasing equipment. What is the best thermostat to keep the temp just where you want it?