I have a nipple watering system that is a 2gal bucket with tubing down to a PVC pipe with 4 nipples on it. I plan to buy a submersible heating coil for the bucket. My question is how do i keep the water unfrozen doen the tubing and into the PVC and nipples? Will the heating element be enough to keep the nipples from freeing? What do you guys to that hove this type of watering system?