Long Island Oil to Gas Conversion: One Project, One Contractor
Switching from oil to natural gas is one of the biggest single-project decisions a Long Island homeowner can make. Done right, it cuts your annual heating bill by 20 to 40 percent, eliminates oil deliveries forever, simplifies maintenance, and gets you out from under the carbon footprint of fossil-fuel heat. Done wrong, it's a coordination nightmare across utility, town inspectors, equipment, gas line, oil tank removal, soil testing, and chimney lining.
All Island Comfort runs the conversion as a single turn-key project. We pull the permits, talk to National Grid, install the new high-efficiency gas boiler or furnace, run new gas piping where it's needed, handle the old oil tank, install a chimney liner if required, and submit the rebate paperwork on your behalf. Family-owned in Wading River since 2004.
- Full Oil-to-Gas Heating System Conversion
- High-Efficiency Gas Boiler Installation (95%+ AFUE)
- High-Efficiency Gas Furnace Installation (95%+ AFUE)
- New Indirect Water Heater (Boiler-Fed)
- New Gas-Fired Tank or Tankless Water Heater
- Gas Line Installation & Sizing
- Oil Tank Removal or Abandonment
- Stainless Steel Chimney Liner Installation
- National Grid Coordination & Permits
- Rebate & Federal Tax Credit Documentation
Call 631-591-2289 for a free in-home conversion estimate, or request a quote online.
Free In-Home Conversion Estimate
Real numbers in writing: equipment cost, gas line, tank removal, chimney work, projected fuel savings, and applicable rebates. No high-pressure pitch, ever.
Call 631-591-2289Why Convert from Oil to Gas on Long Island?
The case for converting comes down to four things. We talk through all of them at the estimate so you're not just taking our word for it:
- 20-40% Lower Heating Bills: Natural gas typically costs less per BTU than #2 heating oil. Combined with a high-efficiency new boiler or furnace, most homeowners see meaningful annual savings.
- No More Oil Deliveries: No driveways, no calls, no winter price spikes, no scheduling. Gas is just there.
- Lower Maintenance: Modern gas equipment runs cleaner. Annual tune-ups are simpler and cheaper than oil burner service.
- Tank Liability Goes Away: Removing or abandoning your oil tank eliminates the risk of a leak and the insurance surcharges that come with old underground tanks.
- Better Resale Value: Long Island home buyers increasingly prefer gas-heated homes. Conversion documentation is a selling point.
- Cleaner Combustion: Natural gas produces less particulate, less soot, no oil odor, and a smaller carbon footprint than #2 heating oil.
The Conversion Process: Six Steps
Here's exactly what an All Island Comfort oil-to-gas conversion looks like, start to finish:
- 1Free In-Home Estimate
We come out, look at your existing system, measure for new equipment, check the gas-line route, evaluate the oil tank, inspect the chimney, and price the project in writing. Includes equipment options at multiple efficiency tiers and a real estimate of fuel savings.
- 2Gas Service Application
If you don't already have a gas meter, we file the service application with National Grid (or your local utility). This step takes 4 to 8 weeks on average, longer in busy seasons. We track the application and update you weekly.
- 3Permits & Pre-Install
While the gas service is in progress, we pull town/village building, gas, and mechanical permits. Coordinate any chimney lining work, sidewalk-cut permits if a new gas line crosses the street, and order equipment.
- 4Equipment Install & Gas Line
Once the gas meter is set, install day arrives. Typically a 1 to 3 day on-site project: new boiler or furnace, near-boiler piping, gas piping inside the house from meter to equipment, electrical, condensate drainage, and venting (chimney liner or direct-vent sidewall).
- 5Oil Tank Removal & Cleanup
The old oil burner is removed with the boiler. The oil tank is pumped, cleaned, and removed (above-ground) or abandoned-in-place (underground when removal isn't feasible). All disposal documented at certified facilities.
- 6Commissioning & Paperwork
Combustion analysis, leak test, system commissioning, customer walk-through. We submit the National Grid rebate paperwork, document equipment for the federal tax credit, and leave you with a clean folder of permits, inspections, and warranties.
What Equipment Goes In: Choices & Brands
The new system depends on what you have today. Most Long Island homes with hydronic (radiator/baseboard) heat get a new high-efficiency gas boiler, often paired with an indirect water heater for hot water. Forced-air homes get a high-efficiency gas furnace, paired with a separate gas water heater.
High-Efficiency Gas Boilers
Modern condensing gas boilers hit 95%+ AFUE. We install Buderus, Weil-McLain, Burnham, Lochinvar, Crown, Triangle Tube, and Navien gas boilers. More on our boiler services here.
High-Efficiency Gas Furnaces
96-98.5% AFUE gas furnaces from Carrier, Trane, Lennox, Bryant, Rheem, Goodman, and others. More on our furnace services here.
Combi Boilers (Heat + Hot Water in One Unit)
Navien, Rinnai, and Triangle Tube combination boilers handle both home heating and on-demand hot water from a single wall-mounted unit. Great fit for smaller homes and tight mechanical rooms.
Indirect or Tankless Water Heaters
Pair the new gas boiler with an indirect water heater for unmatched recovery, or replace the existing tank with a new gas tank or tankless unit. More on water heaters here.
Cost Factors for a Long Island Conversion
Conversion projects vary in cost based on the home, the equipment, and the scope of work. Most Long Island conversions land between $9,000 and $18,000 before rebates and tax credits. Major cost drivers:
- Equipment Type (Boiler, Furnace, Combi)
- Equipment Efficiency Tier (95% vs 98%)
- Brand & Model
- Distance from Gas Meter to Equipment
- Gas Line Diameter Required (Based on Total Load)
- Sidewalk or Street Cut for Gas Service
- Oil Tank Type (Above-Ground vs Underground)
- Soil Testing & Remediation if Tank Leaked
- Chimney Liner Required or Direct-Vent
- Indirect Water Heater Add-On
- Smart Thermostat & Zoning Upgrades
- Permits & Inspection Fees
Rebates, Incentives & Tax Credits
Several incentives can stack on a Long Island conversion. We complete the paperwork as part of the project:
- National Grid Rebates: Conversion-specific and high-efficiency equipment rebates available periodically. Eligibility depends on equipment AFUE and program window.
- Federal Tax Credit (Section 25C): Up to $600 for qualifying high-efficiency gas boilers and furnaces.
- PSEG Long Island Programs: Smart-thermostat and other energy-program rebates.
- Manufacturer Promotions: Equipment-specific rebates from Buderus, Carrier, Trane, Navien, etc., when available.
- Financing Options: We work with financing partners to spread the project cost over 5 to 10 years if you'd rather not pay all up front.
Note that the heat-pump alternative (NYS Clean Heat) often has higher rebate dollars than gas conversion in the current 2025-2026 cycle. We'll show you both side-by-side at the estimate so you can pick the path that fits your budget and goals. More on heat pumps here.
"Switched from a 1990s oil boiler to a Buderus high-efficiency gas boiler with an indirect water heater. They handled National Grid, the gas line, the basement tank removal, and a stainless chimney liner all as one project. Heating bill dropped by close to 35 percent the first winter."
Chimneys, Liners & Venting
One detail that surprises most Long Island homeowners: an old masonry chimney sized for hot oil exhaust often won't safely vent the smaller, cooler combustion gases from new gas equipment. The fix is one of two things:
- Stainless Steel Chimney Liner: Drop a properly sized stainless flue inside your existing masonry chimney. Standard solution for atmospheric/B-vent gas equipment.
- Direct-Vent / Sidewall Vent: High-efficiency 90%+ AFUE condensing equipment uses PVC or polypropylene venting straight through the side wall. Bypasses the old chimney entirely. Often the better long-term answer.
We assess the chimney during the estimate and recommend whichever path makes sense for your equipment, layout, and budget. Cost included up front, no surprises.
Why Long Island Chooses Us for Oil-to-Gas Conversion
Conversions go badly when the contractor only does one piece of the project. The boiler company hands you off to the gas line plumber who hands you off to the tank removal company who never talks to the chimney guy. Long Island homeowners pick All Island Comfort because:
- Family-Owned in Wading River Since 2004
- One Contractor for the Entire Project
- NATE-Certified & Fully Licensed in NY
- National Grid Coordination Handled
- Permits & Inspections Pulled and Tracked
- Real Heat-Loss Calculations on Every Sizing
- Up-Front Pricing in Writing
- Rebate Paperwork Submitted on Your Behalf
"Replaced our 25-year-old oil boiler with a Navien combi unit. They removed the basement tank and old burner the same day, ran the gas line cleanly, and the new system runs quieter than anything we've had. Got a federal tax credit and a small National Grid rebate."
Related Long Island Services
Conversions are by definition multi-service projects. The pieces customers commonly book together: