Have been thinking of installing OAK on my Harman Insert so I called my dealer and asked for his opinion and costs involved. He was not sold on its viability on all homes. "Each home is different" he said and that it would take years to recoup the cost. Cost for parts alone for my stove will run $247 plus tax. Dealer said I could save the cost of a few bags each year by installing the OAK but would depend on many factors. That price I can buy another 1 - 1/4 tons of pellets. Wife also said she does not like the idea of another "dryer vent" sticking out of the house but I like the idea of my stove being more efficient. Thoughts?