> A good chunk of the heat is going to go right up the chimney It's probably not much.. but I imagine you could boost the efficiency by lining the chimney wit

> A good chunk of the heat is going to go right up the chimney It's probably not much.. but I imagine you could boost the efficiency by lining the chimney with copper tube and running water through it, using the waste heat there to heat this water. Then use your TEG as a heat-exchanger between that loop and another loop connected to your "domestic water heater" or other cold water supply.