Squeeze every last bit of heating capacity from your wood or coal stove. This 8-inch heat reclaimer attaches to your wood stove's flue. Using four heat exchanger tubes, it recaptures the heat that's headed up the chimney.
The device slows down the exhaust enough to grab a few extra BTUs, but not enough to create creosote build-up, says the manufacturer.
The thermostatically controlled fan moves around 110 cubic feet per minute. The reclaimer can also be used with coal stoves.