Bioheat is a blend of conventional heating oil and biodiesel — a renewable fuel made from recycled cooking oil, soybean oil, animal fats, and other organic feedstocks. It is one of the most practical paths to reducing the carbon footprint of home heating without replacing your existing oil furnace or boiler.
How Bioheat Blends Work
Bioheat blends are identified by their biodiesel percentage. The most common blends available in the Northeast are:
B5: 5 percent biodiesel, 95 percent heating oil. This is the most widely available blend and is already used by many Northeast dealers as a standard product. It is functionally identical to conventional heating oil in all conditions and requires no equipment modification.
B10: 10 percent biodiesel. Widely available and compatible with standard equipment. A growing number of Northeast dealers offer B10 as their standard product.
B20: 20 percent biodiesel. Reduces carbon emissions by approximately 16 percent compared to conventional heating oil. Compatible with most modern oil equipment without modification. Some older systems benefit from a fuel filter replacement before switching to B20.
B50: 50 percent biodiesel. Requires confirmation of equipment compatibility and is typically used in commercial applications or newer residential systems specifically designed for higher blends.
B100: 100 percent renewable biodiesel. Produces near-zero lifecycle carbon emissions. Currently being piloted by forward-looking dealers and utilities in Massachusetts, New York, and Connecticut. Not yet widely available for residential heating but expanding rapidly.
Is Bioheat More Expensive?
The price premium for Bioheat depends on the blend and the market. B5 is often priced at or near conventional heating oil — many dealers use it as their standard product without a surcharge. B20 typically carries a premium of 5 to 20 cents per gallon over conventional oil. B100 is currently more expensive than conventional oil, though prices are falling as production scales.
The economics of Bioheat also benefit from the fact that no equipment replacement is needed. The transition from conventional oil to B5 or B20 costs nothing beyond any difference in fuel price.
Environmental Benefits
Biodiesel reduces lifecycle greenhouse gas emissions compared to petroleum diesel and heating oil. The U.S. Department of Energy estimates that B20 reduces lifecycle carbon dioxide emissions by approximately 15 percent compared to conventional heating oil. B100 achieves reductions of 50 to 80 percent depending on feedstock.
Bioheat also produces fewer particulates and sulfur compounds than conventional heating oil, improving local air quality. This is particularly relevant in dense urban and suburban areas where residential heating contributes meaningfully to winter air quality.
Compatibility With Your Equipment
For blends up to B20, compatibility with standard oil heating equipment is well-established. The National Oilheat Research Alliance (NORA) and major equipment manufacturers including Beckett, Riello, and Weil-McLain have tested and approved B20 for use in standard residential heating equipment.
For blends above B20, check with your equipment manufacturer. Newer equipment — particularly high-efficiency condensing boilers installed after 2010 — is generally compatible with higher blends. Older cast-iron boilers and furnaces with older burner components may need evaluation before using blends above B20.
A practical step before switching to any Bioheat blend above B10 is replacing the fuel filter and having the system serviced. Biodiesel has cleaning properties that can dislodge sediment accumulated in older tanks and fuel lines, which is better managed with a fresh filter in place.
Bioheat Availability in the Northeast
Bioheat availability varies by state and dealer. Massachusetts has been the most aggressive adopter — the state’s Clean Heat Standard is driving dealers toward higher blend levels, and B20 is becoming a standard product for many Massachusetts dealers. Connecticut and New York have active programs supporting Bioheat adoption. Maine, New Hampshire, Vermont, Rhode Island, New Jersey, Pennsylvania, Delaware, and Maryland all have Bioheat available through dealers who have made the investment in the fuel supply.
Ask your current dealer whether they offer Bioheat blends. If they do not, dealers who do are increasingly common in most Northeast markets.
The Regulatory Direction
Several Northeast states are moving toward mandating minimum biodiesel content in heating oil as part of their clean energy and emissions reduction goals. Massachusetts has set a pathway toward B50 and eventually higher as production and infrastructure develop. New York has similar programs. This regulatory direction makes Bioheat an increasingly mainstream product rather than a niche option.
Frequently Asked Questions
Does Bioheat burn differently than regular heating oil? At blends up to B20, Bioheat burns virtually identically to conventional heating oil from the perspective of your heating system. BTU content is slightly lower for biodiesel than petroleum distillate, but the difference at B20 is less than 1 percent — not measurable in your fuel consumption.
Will Bioheat void my equipment warranty? Most major heating equipment manufacturers have updated their warranties to cover B20 and many cover higher blends. Check your equipment manufacturer’s current guidelines. Warranties on equipment installed after approximately 2015 almost universally cover B20.
Is Bioheat available as automatic delivery? Yes — dealers who carry Bioheat blends offer them on both COD and automatic delivery. If you are on automatic delivery, ask your dealer to switch your product to B20 or their standard Bioheat blend.
Can I mix Bioheat with conventional heating oil in my tank? Yes. If you have conventional heating oil in your tank and receive a Bioheat delivery, the blends mix without issue. You do not need to empty the tank first.
Is there a Bioheat dealer near me? The National Biodiesel Board maintains a directory of Bioheat dealers at biodiesel.org. In the Northeast, availability is highest in Massachusetts, Connecticut, New York, and New Jersey.