I am new here and need help selecting a pid. I need to be able to easily switch between two temperature setpoints at will. Maybe I should explain exactly what I am doing. I am collecting used motor oil, boiling it to remove any water, then centrifuging it to remove particulate contaminants. The end product is blended with diesel fuel for use as fuel in my tractors. I accomplish this with a 5500W, 220VAC water heater element in a 55 gallon drum. Temperature control has been a problem from the beginning. After I boil for a few hours, I need to let it cool to 160 to 180F to run the centrifuge pump for a couple more hours. I will run the pump manually because I need to stop it to clean the centrifuge periodically. I may boil one day, then centrifuge a couple days later. Is there a way to do this with a single pid? I am thinking a dual display unit with a ssr output to power an external relay to run the heating element. I have selected a j type thermocouple in a stainless steel well. The pid selection is my problem. Didn't they used to make pid's with a toggle switch for this purpose? How would you guys approach this and what would you use?