DIY Water Heating with Compost
(Page 3 of 3)
July/August 1981
By the Mother Earth News Editors
KEEPING AN EYE ON THE COMPOST PILE
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Now that we've got the system all hooked up, we plan to watch our water-heating compost pile closely throughout the summer and fall . . . until the decomposing heap begins to "die out" and its heat-producing capacity wanes. We hope this new design will provide evidence that a simple pile of wood chips and manure, connected to a closed-loop plumbing circuit, can heat enough water for the average household's use . . . so watch forthcoming issues of MOTHER for follow-up details on just how the "new" system is working out.
HERE'S ANOTHER "HOT" ITEM
Bill Mayes is well known in the small mountain community of Brevard, North Carolina . . . not only for his fine flock of sheep (a few of which have joined the expanding livestock herd at MOM's Eco-Village), but also for the unusual way he waters those animals.
Bill recently learned that a sheep raiser can actually reduce feed expenditures by giving preheated water to lactating ewes, so that the animals use up less body energy (and thus require less food) to warm the water they drink for conversion into milk. So—as an inexpensive method of heating his flock's drinking water—the Tar Heel farmer built a low, oval compost pile modeled after the prototypes described in MOTHER's series of articles on the Jean Pain technique. Deep within a straw-bedding-and-sheep-manure mound, Bill buried a 500-gallon water tank and next to that —a coil made from 75 feet of one-inch tubing . . . which is, in turn, joined to an outside valve that empties into the sheep's water tub.
The supply source for this setup is actually the gutter on the barn roof, which feeds rainwater directly into the holding tank inside the decomposing heap. Even though Mr. Mayes has no way of measuring the interior temperature of his four-foot-tall compost pile (which is supported by a wire enclosure similar to the ones we used for MOTHER's first and second mounds), he does know that the water emerging from the heap usually registers about 108°F . . . a temperature which seems to please the sheep, and which saves them from using body energy to warm the liquid produced in their mammary glands.
Mr. Mayes, who operates a boys' camp each summer, says he's been quite pleased with the performance of his "barnyard burner" and plans to use the compost mound as a demonstration project for his campers this season.
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