A word of warning. Plug in and check with your hand the temperature of your metal water warmer before using. I have three that I ordered from my feed store last year that I can place any plastic jug on safely. As well, they are sealed underneath so nothing can get in and touch the element. I asked them to order me another but the one that was sent this time was different. It is made by Little Giant ( no name on the original ones...just plain brown cardboard boxes) and when I checked it after being plugged in for a minute or two, I could have made tea with the amount of heat it generated. It was HOT not warm. Also, the whole of the underside was open except a tiny area right where the main wiring entered the unit. I returned it and will wait the few weeks to get the other kind in. I will ask them who the manufacturer of the desired one is and report back.