Has anyone used the 8" cinder block with a light bulb inside through a very cold winter? I'm seeing the heated bases as being rated to work down to 10 degrees, and we get to -10 sometimes here. Wondering if that block with a 100 watt incandescent would really work before I buy the stuff and try it. If it will keep the base thawed, I'd be okay with hanging a heat lamp above to keep the rest of the water thawed too, I just worry. My growouts will be in the barn stall this winter so I'd still like to use my 6 gallon drinker, I do have a heated dog bowl for the outside coop and I'm fine with filling that twice a day, but potentially 30+ inside would run through a gallon before I got home from work.