What Is Bioheat Fuel Oil? Everything Connecticut Homeowners Need to Know

If you heat your home with oil in Connecticut, you may have started hearing the word ‘Bioheat’ from your fuel delivery company. Maybe it’s on your invoice. Maybe your neighbor mentioned it. Either way, if you’re not sure what it is or whether you should care — this is the guide for you.

The short version: Bioheat is a cleaner, domestically produced blend of traditional heating oil and renewable biodiesel. It works in your existing oil heating system with no modifications, burns cleaner, and reduces greenhouse gas emissions. Connecticut is actually ahead of much of the country in the transition to Bioheat — and understanding it helps you make better decisions about your home’s heating.

What Is Bioheat Fuel?

Bioheat fuel is a blend of ultra-low sulfur heating oil (ULSHO) and biodiesel — a renewable fuel made from organic materials like soybean oil, recycled cooking grease, animal fats, and other agricultural byproducts. These components are blended at a petroleum terminal before delivery.

The blend ratio is expressed as a percentage. B5 means 5% biodiesel and 95% heating oil. B20 means 20% biodiesel. Connecticut has been transitioning to higher blend levels over time as part of a broader clean energy initiative, and Bioheat B20 and above are increasingly common.

The biodiesel component is what makes Bioheat ‘green.’ Biodiesel is produced domestically, primarily from soybean oil, which means less dependence on foreign petroleum and lower lifecycle carbon emissions.

Is Bioheat Compatible with My Existing Heating System?

Yes — and this is one of the most important things to understand about Bioheat. Unlike propane or natural gas, which require entirely different heating equipment, Bioheat works in the same boilers, furnaces, and oil burners that Connecticut homeowners already have.

You don’t need to replace your equipment. You don’t need a new storage tank (for standard blend levels). You don’t need to call a technician to make any changes. The fuel just arrives in your tank and your system burns it as it always has — just a little cleaner.

Most equipment manufacturers approve the use of Bioheat up to B20 or higher. At blend levels B20 and below, performance is equivalent to standard heating oil.

Is Bioheat Actually Cleaner?

Yes, meaningfully so. Compared to standard heating oil, Bioheat fuel produces fewer greenhouse gas emissions over its lifecycle. The higher the biodiesel content, the greater the emissions reduction. Studies have shown that B20 can reduce lifecycle greenhouse gas emissions by approximately 15–20% compared to conventional heating oil.

Bioheat also burns cleaner in other ways: it produces less sulfur dioxide, less particulate matter, and fewer volatile organic compounds than conventional heating oil. This matters for air quality — both outdoors and indoors through flue emissions.

Connecticut’s heating oil industry has committed to reaching B50 blend levels in coming years and eventually transitioning to net-zero Bioheat, which would make oil heating effectively carbon-neutral.

What Are the Benefits for Connecticut Homeowners?

No Equipment Changes Required

You can start using Bioheat fuel immediately with no modifications to your heating system. It’s a drop-in replacement for conventional heating oil. There’s no conversion cost and no downtime.

Lower Carbon Footprint

If reducing your household’s environmental impact matters to you, switching to Bioheat is one of the easiest and most cost-effective ways to do it. You’re cutting emissions without replacing your heating system or making a major investment.

Cleaner Burning = Better System Performance

Bioheat’s cleaner combustion properties are actually good for your heating system. It produces less soot and fewer deposits on heat exchanger surfaces and nozzles. Many heating contractors report that systems running on Bioheat require less cleaning and maintenance over time. A cleaner-burning fuel means better heat transfer efficiency and potentially fewer service calls.

Supports Domestic Agriculture

The biodiesel component of Bioheat is produced primarily from American agricultural crops and waste products. When you use Bioheat, you’re supporting domestic farmers and reducing dependence on imported petroleum.

Does Bioheat Cost More?

At lower blend levels (B5 to B20), the price difference between Bioheat and conventional heating oil is typically minimal — often just a few cents per gallon, if any difference at all. At higher blend levels, prices can vary more depending on biodiesel feedstock costs.

Since Connecticut has been transitioning the entire heating oil market toward Bioheat, many customers are already receiving Bioheat without a price premium. Check with your fuel supplier about what blend level they’re currently delivering.

Any small price difference is often offset by the fuel’s cleaner combustion — which reduces maintenance costs and can improve the efficiency of a well-maintained system.

What Blend Level Does Dependable Energy Deliver?

Dependable Energy delivers Bioheat fuel with a blend level of B5 to B20 to customers throughout Greater Waterbury and surrounding Connecticut communities. We stay current with the latest blend levels and sourcing standards to ensure our customers receive the highest quality fuel available.

If you have questions about what blend level we’re currently delivering — or if you have any questions for the blend — call us at (203) 758-5831. We’re happy to walk you through the options and explain what it means for your specific heating system.

The Future of Heating Oil in Connecticut

Connecticut’s heating oil industry is actively working toward net-zero Bioheat. This roadmap involves progressively increasing the biodiesel blend percentage over the next decade, eventually reaching blend levels that make oil heating effectively carbon-neutral without requiring homeowners to replace their equipment.

For Connecticut homeowners who heat with oil, this is good news: you can keep your existing equipment, continue with familiar delivery and service arrangements, and still benefit from a progressively greener fuel source as the industry advances.

You don’t have to choose between comfort, cost, and environmental responsibility. With Bioheat, you get all three.

Frequently Asked Questions

Q: Does Bioheat work in my existing oil boiler or furnace?

A: Yes. Bioheat is designed to be a drop-in replacement for conventional heating oil. At blend levels up to B20, it’s approved for use in virtually all oil heating equipment without modifications. At higher blend levels, most modern equipment is compatible — but it’s worth confirming with your equipment manufacturer or technician if you have an older system.

Q: Will Bioheat void my heating equipment warranty?

A: Most equipment manufacturers explicitly approve Bioheat fuel up to B20 or higher. At lower blend levels, Bioheat is unlikely to affect your warranty. Check your equipment documentation or call the manufacturer if you have a specific concern. For most Connecticut homeowners, this is a non-issue.

Q: What is biodiesel made from?

A: The biodiesel used in Bioheat fuel is produced from a variety of organic materials, most commonly soybean oil, recycled cooking grease (from restaurants), and animal fats. These are renewable resources that are harvested or reclaimed domestically. The production process converts these fats and oils into a fuel that can be blended with petroleum heating oil.

Q: Is Bioheat safe to store in my oil tank?

A: Yes. Bioheat stores safely in standard home oil tanks — steel or fiberglass — without any special considerations for blend levels up to B20. Higher blend levels may have different storage requirements in extreme cold, since biodiesel has a higher gel point than petroleum oil. Your fuel supplier will account for local climate when selecting blend levels for cold months.

Q: How do I know if I’m already receiving Bioheat fuel?

A: Check your fuel delivery invoice. Many suppliers note the fuel type or blend level on the bill. If you’re not sure, call your fuel supplier and ask. Connecticut is actively transitioning the entire heating oil supply to Bioheat, so there’s a good chance you’re already receiving some blend of Bioheat without having specifically requested it.