Pellet fireplace inserts can be perfectly placed in virtually every pre-open fireplace. The exhaust pipe disappears invisible in the existing chimney.
Other advantages of pellet fireplace inserts are:
A high efficiency, 15 kg of pellets produce only 1% ash, 150 grams of granulate.
The pellets heating power is 3-fold higher than that of firewood - 4,500 kcal / kg, 15 kg of pellets correspond to 45 kg of firewood.
Moreover, the pellets fuel is not toxic, or explosive.