The one's I've worked on have very low pressure. Just enough to circulate. From what I've seen, the most efficient system is the one that goes out horizontally. It takes more acreage but uses less electricity and pumping power. Even better if in a deep pond. The ones that go down vertically into a deep well are less efficient since they take more power and more PSI.
And of course there are exceptions. If you live on top of a volcano, and drill down into a hotbed, I assume that will give you more heat then going horizontally in 5 or 10 feet of depth and 45-50 F degree ground temps.
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Today's Featured Article - Usin Your Implements: Bucket Loader - by Curtis Von Fange. Introduction: Dad was raised during the depression years of the thirties. As a kid he worked part time on a farm in Kansas doing many of the manual chores. Some of the more successful farmers of that day had a new time saving device called a tractor. It increased the farm productivity and, in general, made life easier because more work could be done with this 'mechanical beast'. My dad dreamed that some day he would have his own tractor with every implement he could get. When he rea
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