Wood pellets are a sustainable carbon neutral, renewable biomass energy fuel. The CO2 released when burning wood is re-absorbed by the amount of new trees that we plant.
This chart shows that natural gas is the cheapest form of fuel but not all propertys are on the national grid.
Wood pellets as a fuel qualify for RHI + Green Deal this will make then more cost effective than natural gas. With the additional bonus of reduced carbon emmisions.