Compost Water Heater

Here is a report on MOTHER EARTH NEWS' third attempt at building and using a compost water heater.

070 compost heated water - new compost pile
MOTHER EARTH NEWS' newest compost water heater mound shown here partially completed is a low, rectangular heap with sloping sides (a shape that eliminates the need for a cage) and two flat coils of polyethylene tubing buried inside it. The left inset is of the tubing connections. The right inset is of an old water tank converted into a heat exchange.
PHOTO: MOTHER EARTH NEWS STAFF