tank pads 12v or 120v ?

time2roll wrote:
I went with 120v pads for the waste tanks and 12v/120v combo for the fresh water. You will be plugged in or running a generator near continuous in these conditions.

12v tank heaters range from 4 to 12 amps depending on tank size. I was looking at close to 50 amp load on my 55 amp converter. Seemed like a bit much and we all know a converter can quit. While the pads would cycle on the thermostat in mild conditions the potential seemed a bit much.

I did get the 12/120 combo for the fresh water to prevent freeze up during transit. The empty or half full waste tanks I was not as concerned about if they started to freeze. I did find once the 120v was not enough for the fresh water to keep water flowing and needed both elements heating. My tanks are exposed.

http://www.annodindustries.com/shop/shop/heaters-and-warmers/rv-and-marine/rv-tank-heaters.html

I on the other hand did the 12v/120v combo on my fresh water and just 12v on the holding tanks, I also added a 12v on the grey water drain right near the valve.