Zaria high quality small coal wood pellet making machine for sale

The data is updated on February 2016. From the above comparison, we can come see thatcoalis the cheapest fuel, but it harms the environment; natural gas costs cheaper thanwood pellets, but it is non-renewable resource and not every place has natural gas; hardwood is also cheaper, but its burning efficiency is low and it does take much room to store because of its low density.