kipps - 10/4/2021 12:01
Cooperator - 10/4/2021 10:25
Anything really. Straw bales, stover, old posts, scrap lumber, used oil, tires, trimmed branches and logs.
All that heat can be captured in an incinerator with a heat exchanger that cycles water to an underground heat storage tank,
which can be incorporated with geothermal heating.
But do you have the necessary incinerator, heat exchangers, and heat storage tanks, and have them fully installed and working? If not, it's all a fantasy.