Just got back from a 6 week trip out west with our new T@B max S model. At least had 6 nights of temps in the low 20's. In the past, we had motorhomes with the fresh water tank inside, so just had to add some antifreeze to the gray and black tank, one motorhome had heated tank pads. The T@B tanks, including the fresh water tank are all outside. I;m looking at installing a heat pad on the freshwater tank, gray tank and black tank, which are thermostat controlled. Also, plan to install a pipe pad on the gray water drain pipe and black water drain pipe. These will all work off the battery, but I plan to use them, when plugged in at the campground site. Which means the converter will be handling the load. My concern, is if the converter in the T@B unit will handle the additional load of the pads. I have not talked to the factory yet. Just curious if anyone has installed heat pads on their tanks?