Fossil fuel is extensively used in heating office buildings, large utility complexes, malls etc. Till a few years back, use of oil was cheapest. Now use of gas had subsequently taken over as cheap fuel. However, now, efficient large capacity thermal system burning biomass has become quite price competitive. To control global warming, biomass fired central heating system is necessary and as CO2 emission standards world wide lowers, it is likely to become even more attractive as an option.
Advantages of fossil fuel systems are ease in operation and automatic control of heating.