The Green Pail retained heat cooker will hold 7 liters of pintos hot long enough to cook them well done and keep them above 170 deg F for 5 hours. A Design To Build from LannyPlans.

The Green Pail retained heat cooker is green because:
1- It is made from recycled plastic pails
2- It saves the energy that it takes to simmer food.
3- It keeps the heat out of the kitchen saving summer time ac cost
4- It can be made locally from local materials with local labor.
5- It saves the time necessary to watch food simmer, you can simply set it and forget it, walk away and leave it for hours.
6- It can hold food at safe temps between meals making refrigeration unnecessary, which could be handy in off grid situations.
7- It is a street vender micro enterprise design that someone could build and sell at flea markets, garage sales.