My new fireplace

[Ivan]

Yes, ecofans are driven by a peltier element (or TEG, as it's known when run in reverse!) Designing and building your own can be fun, but you'll find it difficult to replicate the ecofan. The problem is that the stove top will get hot enough to make the solder in the peltier element 'creep' (migrate away from the joint without actually melting). I've tried it - it lasts around 4months before this happens.

[Treebeard]

How about silver solder? Or do you mean the solder used in the construction of the Peltier unit?

[Ivan]

The solder actually inside the element. Basically each ceramic sheet is faced with blobs of solder to join the dissimilar metals that make up the peltier element