Many people have used 100 watt light bulbs under a sink to prevent freezing pipes on especially cold nights, people usually choose to avoid touching a 100 watt light bulb that has been on for a bit, and the Easy-bake Oven used to use a 100 watt light bulb, but I suspect that you will find the 12 volt appliances you posted woefully under-powered in your Jon boat, never mind outside in the wind.Alright, I'm a bit skeptical, but a friend on another forum has been using these for a couple years and suggested them. Here's a video on a 180watt 12v pan frying a burger. The jury is out.