Heating Oil vs. Wood Pellets: An Honest Comparison for CT Homes

Wood pellets have earned their place as a serious heating fuel option in Connecticut — not just a niche alternative. Modern pellet boilers and furnaces achieve 85–90% efficiency, automatic feed systems make them nearly as convenient as oil, and pellet prices have been less volatile than heating oil over the past decade. Here's the real comparison.

Cost Per BTU: How the Fuels Stack Up

The standard comparison metric for heating fuels is cost per million BTU (MMBTU). A ton of wood pellets contains approximately 16 MMBTU. A gallon of heating oil contains approximately 138,000 BTU.

At current prices, wood pellets deliver heat for roughly 25–35% less per BTU than oil. For a household using 700 gallons of oil per year (approximately 77 MMBTU of useful heat at 80% AFUE), switching to pellets could save $600–$800 annually at 2026 prices.

Equipment Cost and Conversion

This is where the calculation gets complicated. You can't simply swap a pellet boiler into the space your oil boiler occupies without significant investment:

• Pellet stove (supplemental heat only): $2,000–$4,000 installed. Not a whole-home solution unless your house is small and open-plan.
• Pellet boiler (whole-home, hydronic): $8,000–$18,000 installed, including pellet storage bin, automated feed auger, and integration with existing distribution system.
• Pellet furnace (forced air): $5,000–$10,000 installed.

At $700/year in savings, a $12,000 pellet boiler installation has a 17-year payback — which is marginal. The math improves if oil prices rise, if you buy pellets in bulk, or if you qualify for rebates (see CT pellet boiler rebates through Energize CT, which can offset $1,000–$2,500).

Convenience: The Real Differentiator

Modern pellet boilers with automatic feed systems are nearly as convenient as oil — but not quite. The differences:

• Fuel storage: A ton of pellets takes up about 40 cubic feet. You need either a bulk storage bin (like a large hopper in the basement) or space for bagged pellets (40-lb bags). Oil tanks are typically underground or compact above-ground.
• Ash removal: Pellet boilers produce ash that must be emptied periodically — typically every 1–2 weeks in peak heating season. Oil systems produce no ash.
• Power outages: Pellet systems require electricity for the feed auger and ignition. No power = no heat. Same is true for modern oil systems, but pellet systems have this limitation as well.
• Delivery flexibility: Pellets are widely available at hardware stores (in bags) and from bulk delivery providers. Heating oil delivery is more established in CT with more providers.

Who Should Consider Wood Pellets

Pellets make the most sense if: you have space for a bulk storage bin, you're already replacing a failing boiler anyway (switching during replacement minimizes net cost), you're committed to the slightly higher maintenance involvement, and you're buying bulk (not bagged) pellets. If you're evaluating pellets primarily to save money and would be installing a new system from scratch, run the full payback calculation before committing.

Related: Heating Oil vs. Propane: Which Is Right for Your Home?  ·  Heating Oil vs. Natural Gas: Should You Convert? A Homeowner's Guide