Multi-Fuel Heaters will run on most oils including heating oil, diesel etc. These heaters will also burn waste oil subject to local regulations. Although they burn very cleanly and efficiently, since April 2016 registration and fees are currently required with local councils in the UK to run these on waste oil. The disproportionate cost of the registration and annual fees currently makes registration non-viable. This highly controversial legislation is based on an EU directive and may change in the future.