"Insight News" wrote in message
m...
I just put in a 9x12 greenhouse. Water is plumbed directly inside with a
dual carbon filtration system. I usually water with a spray wand, but it
seems like the ground water temps in January are going to be too cold to be
practical. How does everyone deal with water temps during the winter?

I am using two 55 gallon plastic barrels as a solar heat sink. I am
thinking about using one of these as my source for plant water, and would
just refill with ground water. Thoughts?

There's was a post on a GH forum that these solar heat sinks don't really
work. They cool off with the GH when the sun goes down. I use my 40g
plastic barrel just for watering the plants and refill it from the outside
hose twice a week. It doubles as a place to overwinter my pond's water
lettuce.