Have been trying to wean ourselves off coal in our rayburn. Tried 3 different'flavours' of heat logs and these ones from Hereford were the best (longest burning, most consistent) and the most local. Throw out a good heat...reaches cooking temp (200 deg) easily One box lasts one day but still use coal to keep it in at night. Disadvantage of course is you have to be around to wack another log on approx every hour. Work very well in woodburners. Unlike wood you need only one at a time and nice and easy to store as in boxes so consistent product however are quite pricey so buy in bulk.