You can leave it on all the time or have it shut off after it reaches temp. It doesn’t really use much energy either way because they are so well insulated. Mine has vacuum insulation that can keep the water to temp for about half a day, and if you want to bring it back to temp you just have to reheat it a few degrees. The vast amount of energy used to bring water to a boil in the beginning of the heat cycle.
But then you have this small container of boiling water constantly in contact with a metal or plastic containment vessel, absorbing who knows what contaminates due the higher temperatures.
You can leave it on all the time or have it shut off after it reaches temp. It doesn’t really use much energy either way because they are so well insulated. Mine has vacuum insulation that can keep the water to temp for about half a day, and if you want to bring it back to temp you just have to reheat it a few degrees. The vast amount of energy used to bring water to a boil in the beginning of the heat cycle.
But then you have this small container of boiling water constantly in contact with a metal or plastic containment vessel, absorbing who knows what contaminates due the higher temperatures.