I wonder how a continuously on stove/oven like http://www.agasales.com/index.htm http://www.agasales.com/index.htm compares. These always remain at temperature.

I wonder how a continuously on stove/oven like http://www.agasales.com/index.htm http://www.agasales.com/index.htm compares. These always remain at temperature. Obviously not a solution for most people.