Check out this video of a self-powered hydronic heating system:
https://www.youtube.com/watch?v=nbJ1PlwC-MA
You can heat hot water in a tank, move heat to radiators, radiant tubing & baseboard.
The circulator pumps are run by the Wood Stove heat.
We have pumps and a pump controller available at:
http://www.tegmart.com/thermoelectric-generator-accessories/
The water cooled thermoelectric generators can be purchased at
http://www.tegmart.com/thermoelectric-generator-products/
