Tear one of these apart? https://www.amazon.com/dp/B007BLN652/ref=cm_sw_r_cp_api_i_5j...

You could also use the coolant to pull heat off the stove (obvs with appropriate safety built in) and run the hot side of the TEC within spec.

I’ve seen wood stoves get red hot after an incorrect damper setting runs for 5-10 mins, direct heating might fry your circuits.