Is It Possible to Use Waste Oil in Hydronic Heating?

Choosing the Right Waste Oil

When selecting waste oil for hydronic heating, look for oils with a high flash point (above 160°F/71°C) and a low viscosity (10-20 cSt at 40°C). Some common examples include used motor oil, vegetable oil, and biodiesel. However, never use cooking oil or oil with high water content, as it can cause corrosion in the system.

Preparing the Waste Oil

Before using waste oil in your hydronic heating system, it’s essential to filter and purify the oil. A 10-micron filter is a good starting point, but consider using a more advanced filtration system, especially if the oil comes from an industrial source. Some waste oil suppliers also offer pre-filtered oil, which can save you time and money.

System Design and Maintenance

To use waste oil in hydronic heating, you’ll need a system specifically designed for this purpose. This includes a waste oil boiler, a heat exchanger, and a well-insulated piping system. Regular maintenance is crucial to prevent corrosion and ensure the system runs efficiently. Consider scheduling annual inspections and cleaning the system every 6-12 months to maintain peak performance. Additionally, use a corrosion inhibitor in the waste oil to protect the system from acidic compounds.