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Plantman · 02-18-12, 06:49 PM

I have a 1200 gal rain barrel for my greenhouse. It collects water off my barn roof. It is green polyethylene, which prevents sunlight and algae growth. It is buried in the ground except for the top foot or so to keep it from freezing. I now use it to heat my greenhouse. I circulate water through plastic tubing in the top of the greenhouse, which can reach 100 degrees when it is 40 outside. I then circulate this through tubing in the ground at night when it is below freezing. I use a pump designed for herbicide spaying. It is 12v, connected to a solar charged battery. It automatically goes on when pressure drops and stops when water is not used and pressure increases. I can also empty it by gravity flow using a garden hose when the outlet is lower than the water level in the tank, but you have to get the siphon going first, and it is slow with very little pressure.

02-18-12, 06:49 PM	#33
Plantman Lurking Renovator Join Date: Feb 2012 Location: Angola, IN Posts: 24 Thanks: 0 Thanked 4 Times in 3 Posts	I have a 1200 gal rain barrel for my greenhouse. It collects water off my barn roof. It is green polyethylene, which prevents sunlight and algae growth. It is buried in the ground except for the top foot or so to keep it from freezing. I now use it to heat my greenhouse. I circulate water through plastic tubing in the top of the greenhouse, which can reach 100 degrees when it is 40 outside. I then circulate this through tubing in the ground at night when it is below freezing. I use a pump designed for herbicide spaying. It is 12v, connected to a solar charged battery. It automatically goes on when pressure drops and stops when water is not used and pressure increases. I can also empty it by gravity flow using a garden hose when the outlet is lower than the water level in the tank, but you have to get the siphon going first, and it is slow with very little pressure.