The installation of wood (pellet/chip)boilers for central heating and DHW is gathering pace. Worcester county hall have one and I recently visited a small school in Buckinghamshire and a commercial plant nursery in Slough that had them.
A government agency "Thames Valley Energy" one of six covering the UK arranged the tie up with pellet / chip suppliers and the sites they also assisted in obtaining funding.

Wood fired boilers now come in all sizes small domestic to industrial.

If however you wish to consider oil look at waste oil burners which use waste car engine oil. You can almost be paid by the garage to take it away at the moment.