I want to heat the contents (water) of a two liter thermos flask using a low power (50-100 watt) 12 volt DC heater.
Rather than buying a tiny little immersion heater, I've got some nichrome wire knocking about my workshop, would it be electrically safe to use a length of bare nichrome wire directly in the water to heat it?
My natural reaction is not mix electricity with water, but when I think about it I can't really envisage any real problems.
My intention is to use two length of wire, one about 100watts to heat the water in the first place, and a 2nd, about 3 watts to keep it warm once it's boiled.
Update for the curious... The flask is a traditional glass thermos, my intention is to to use this in a caravan with solar cells charging a 12v battery. The hope is that I can provide myself with a low power solution that will give me a permanent supply of hot water for occasional tea/coffee. Experimentation has indicated that I can keep a 2 liter thermos at about 95 degrees with only a couple of watts, and it only takes a few minutes of 100watts to heat the water again after drawing off a cup.
I think the electrical safety questions have been answered, but I'll try to do a bit more research about how healthy nichrome wire in drinking water may be.