Expert oil boiler replacement and oil to gas conversion across Nassau and Suffolk County. Licensed, permitted, and serving Long Island since 1979.
Many Long Island homes, particularly in eastern Nassau and throughout Suffolk County, still rely on oil heat. If your oil boiler is aging, producing higher fuel bills, or requiring frequent repairs, replacement with a new high-efficiency oil boiler or a conversion to natural gas can significantly reduce your heating costs and improve comfort. We handle both options and help you determine which path makes the most financial sense for your situation.
An oil boiler burns heating oil to heat water, which is then distributed through your home via baseboard radiators, cast iron radiators, or radiant floor tubing. Oil is stored in a tank, either inside the basement or buried underground. Modern oil boilers achieve 84-87% AFUE, a significant improvement over older models that often operate at 60-75% efficiency. Upgrading from a 25 to 30 year old oil boiler to a new unit can reduce your oil consumption by 20-30%, saving hundreds of dollars per year even before considering the option of switching fuels entirely.
Oil boilers require more maintenance than gas models, including annual nozzle and filter replacement, combustion chamber cleaning, and burner adjustment. Despite the higher upkeep, oil heat produces a hotter flame than gas, providing rapid and powerful heating that is well suited to the large, older homes common across Long Island. We have been installing and replacing oil boilers on Long Island since 1979 and understand the specific requirements of oil heating systems in this region.
When your oil boiler needs replacement, you have three paths forward. The right choice depends on whether natural gas is available on your street and your long-term cost priorities.
| Option | Installed Cost | Annual Fuel Cost (avg) | Best For |
|---|---|---|---|
| New Oil Boiler | $6,000 – $12,000 | $2,500 – $3,500 | No gas available. Keeping current system type. |
| Convert to Gas | $8,000 – $15,000 | $1,200 – $1,800 | Gas available on street. Long-term savings priority. |
| Convert to Heat Pump | $12,000 – $25,000 | $800 – $1,400 | Want heating + cooling. Lowest operating cost. |
If natural gas is not available on your street, a new oil boiler is the straightforward and most cost-effective choice. If gas is available, an oil to gas conversion saves 25-40% on annual heating costs and typically pays for the extra upfront cost within 3 to 5 years. For a complete analysis of all boiler types, see our boiler types comparison guide.
| Brand | Equipment Price | AFUE | Highlights |
|---|---|---|---|
| Weil-McLain | $3,000 – $6,500 | 84 – 87% | WGO and WTGO series. Cast iron. Industry standard on LI. |
| Burnham | $2,500 – $5,500 | 84 – 87% | V8 series and MPO-IQ (87% AFUE). Reliable cast iron. |
| System 2000 | $4,000 – $7,000 | 87% | Multi-pass heat exchanger. Integrated DHW. Premium tier. |
| Buderus | $3,500 – $7,000 | 84 – 87% | G115 and G215 series. German engineering. Premium. |
| Williamson | $2,200 – $4,500 | 84 – 86% | GWA and GSA series. Value-priced. Popular in Northeast. |
| New Yorker | $2,200 – $5,000 | 84 – 87% | CL series. Strong oil lineup. American-made. |
| Peerless | $2,500 – $5,000 | 84 – 86% | WBV and EC/ECT series. Cast iron. Value-priced. |
All prices shown are equipment only. Total installed cost depends on the model, BTU rating, and installation complexity. For a full cost breakdown, see our boiler replacement cost guide.
Replacing with another oil boiler: Your existing tank can remain in service if it passes inspection. We check the tank age, condition, and connections as part of every oil boiler assessment. Tanks over 20 years old should be evaluated for replacement regardless of the boiler project.
Converting to gas: The oil tank must be properly decommissioned or removed according to Nassau and Suffolk County regulations. Above-ground tank removal typically costs $500 to $1,500. Underground tank removal costs $1,000 to $3,000+ and may require soil testing. We coordinate all tank work as part of the conversion project.
Underground tanks: If you have a buried oil tank, it is important to address it proactively. Leaking underground tanks can create significant environmental liability and remediation costs. New York State requires proper closure of abandoned underground storage tanks.
Proper sizing based on your home, insulation, and the Long Island climate zone.
Disconnection, removal, and disposal of the existing oil boiler.
All oil supply lines, return lines, chimney connections, and venting.
Required mechanical permit and post-installation building department inspection.
We assess your tank condition and connections as part of every oil boiler job.
Combustion analysis, zone testing, safety control verification, and homeowner walkthrough.
If natural gas is available on your street, converting from oil to gas can save 25-40% on annual heating costs, eliminate oil deliveries and price volatility, remove the environmental risk of an aging oil tank, and open the door to high-efficiency condensing technology (95-98% AFUE) that is not available with oil.
An oil to gas conversion typically costs $8,000 to $15,000 total, including the new gas boiler, gas line connection, oil tank removal, and installation. Most homeowners recoup the extra cost within 3 to 5 years through lower fuel bills.
We help you evaluate whether conversion makes sense for your situation. Learn more about oil to gas conversion or call (631) 860-6681 for a free assessment.
Oil boilers typically last 20 to 25 years with proper annual maintenance. Signs that replacement is approaching include rising fuel consumption despite similar usage, repair costs exceeding $1,500 in a single year, visible rust or corrosion on the boiler body or heat exchanger, soot buildup that returns quickly after cleaning, difficulty maintaining consistent temperatures, and a boiler age of 20 years or more. For a detailed guide, see 10 signs it is time to replace your boiler or use our repair vs. replace decision guide.
Every oil boiler replacement begins with a free in-home assessment. We inspect your current boiler and oil tank, perform a heat loss calculation, evaluate whether an oil to gas conversion makes financial sense, and provide a detailed written estimate with no obligation. Call (631) 860-6681 or schedule online.
Schedule a free in-home assessment. We will inspect your boiler and tank, evaluate your options, and provide a detailed written estimate with no obligation.