In article , R. Zimmerman wrote:

A waste of time if you already have a gasoline engine. The engine could be
adapted to run on all kinds of gaseous products such as coal gas or methane
from sewage/manure.
Better to make a gas producer than a boiler.

Better to use a diesel and run it on vegetable oil. Relatively easy to
come up with.

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Mike Graham | Metalworker, rustic, part-time zealot.
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http://www.metalmangler.com| Caledon, Ontario, Canada