The Kube stove has classic clean lines, with a number of elegant features, such as the side windows that fit neatly in the stones without a steel frame. The Kube woodstove has classic clean lines, with many elegant features, such as the side windows that fit neatly into the stones without a steel frame. The Kube masonry stove is available with or without side windows, as well as in different heights. Like all our masonry heaters, the door is made of high-quality cast iron, which makes it robust and durable. The optional side windows have a double layer which ensure good combustion and minimizes heat loss through the windows.