<P> The growth in popularity of wood heat also led to the development and marketing of a greater variety of equipment for cutting, splitting and processing firewood . Consumer grade hydraulic log splitters were developed to be powered by electricity, gasoline, or PTO of farm tractors . In 1987 the US Department of Agriculture published a method for producing kiln dried firewood, on the basis that better heat output and increased combustion efficiency can be achieved with logs containing lower moisture content . </P> <P> The magazine "Wood Burning Quarterly" was published for several years before changing its name to "Home Energy Digest" and, subsequently, disappearing . </P> <P> A pellet stove is an appliance that burns compressed wood or biomass pellets . Wood heat continues to be used in areas where firewood is abundant . For serious attempts at heating, rather than mere ambience (open fireplaces), stoves, fireplace inserts, and furnaces are most commonly used today . In rural, forested parts of the U.S., freestanding boilers are increasingly common . They are installed outdoors, some distance from the house, and connected to a heat exchanger in the house using underground piping . The mess of wood, bark, smoke, and ashes is kept outside and the risk of fire is reduced . The boilers are large enough to hold a fire all night, and can burn larger pieces of wood, so that less cutting and splitting is required . There is no need to retrofit a chimney in the house . However, outdoor wood boilers emit more wood smoke and associated pollutants than other wood - burning appliances . This is due to design characteristics such as the water - filled jacket surrounding the firebox, which acts to cool the fire and leads to incomplete combustion . Outdoor wood boilers also typically have short stack heights in comparison to other wood - burning appliances, contributing to ambient levels of particulates at ground level . An alternative that is increasing in popularity are wood gasification boilers, which burn wood at very high efficiencies (85 - 91%) and can be placed indoors or in an outbuilding . There are plenty of ways to process wood fuel and the inventions today are maximizing by the minute . </P> <P> Wood is still used today for cooking in many places, either in a stove or an open fire . It is also used as a fuel in many industrial processes, including smoking meat and making maple syrup . </P>

In which form chemical energy stored in wood get converted while burning