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 - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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