How much you should expect to pay for a new boiler, broken down by type, brand, efficiency, and what is included in the price.
Answer a few questions to get an estimated price range for your project. Takes about 30 seconds.
Boiler replacement on Long Island typically costs between $7,900 and $12,000 for a residential installation, including the boiler unit, labor, materials, old boiler removal, and permits. The national average for a boiler replacement sits around $8,400 according to 2025-2026 industry data from HomeAdvisor, Angi, and Fixr. On Long Island, costs tend to run 10-20% above national averages due to higher labor rates, permitting requirements in Nassau and Suffolk County, and the prevalence of older homes with more complex piping systems.
The final price depends primarily on the boiler type and fuel source, the efficiency rating, the brand, the complexity of the installation, and whether you are switching fuel types. This guide breaks down every cost factor so you can budget accurately and avoid surprises.
The single biggest factor in your total cost is the type of boiler you install. A standard-efficiency gas boiler replacing an existing gas unit is the least expensive option. A high-efficiency condensing boiler, a fuel conversion, or a heat pump system will cost more upfront but can save significantly on fuel costs over time.
| Boiler Type | Equipment Only | Total Installed | Efficiency | Notes |
|---|---|---|---|---|
| Gas (Standard) | $4,800 – $5,800 | $7,900 – $9,800 | 80-89% AFUE | Most common on LI. Cast iron, chimney vented. |
| Gas (Condensing) | $3,500 – $4,500 | $8,500 – $12,000 | 95-98% AFUE | PVC vented, requires condensate drain. Qualifies for rebates. |
| Oil | $4,000 – $5,500 | $7,900 – $10,900 | 84-87% AFUE | Common in eastern Suffolk. Higher maintenance. |
| Steam | $4,100 – $5,100 | $8,000 – $11,000 | 80-85% AFUE | For homes with cast iron radiators. Complex piping. |
| Hot Water | $1,600 – $4,500 | $2,900 – $5,600 | 82-98% AFUE | Baseboard or radiant. Wide range based on efficiency. |
| Combi | $2,900 – $5,000 | $7,900 – $9,900 | 90-98% AFUE | Heating + hot water. Wall-mounted, saves space. |
| Electric | $4,000 – $6,000 | $6,900 – $9,900 | 99%+ AFUE | Low install cost, highest operating cost on LI. |
| Heat Pump | $4,000 – $12,000 | $8,000 – $22,000 | 200-300% COP | Heating + cooling. Highest upfront, lowest operating. |
For a detailed comparison of all types including pros, cons, fuel costs, and lifespan, see our boiler types comparison guide.
The brand you choose affects both the upfront cost and the long-term value. Below are approximate equipment-only price ranges for the brands we install most frequently on Long Island. Total installed cost will be higher and depends on the specific model, BTU rating, and installation complexity.
| Brand | Standard Efficiency | High Efficiency | Oil Models | Position |
|---|---|---|---|---|
| Weil-McLain | $3,800 – $4,500 | $3,500 – $8,000 | $3,000 – $6,500 | Mid-to-premium. Cast iron workhorse. Widely available. |
| Navien | N/A (condensing only) | $3,000 – $5,000 | N/A | Mid-range. Wall-hung, compact. WiFi-enabled. |
| Burnham | $3,600 – $4,200 | $6,000 – $9,000 | $3,500 – $4,500 | Value-to-mid. Broad lineup gas and oil. |
| Buderus | $2,500 – $4,500 | $4,500 – $8,000 | $3,500 – $7,000 | Premium (Bosch group). German engineering. |
| Bosch | N/A (condensing only) | $3,500 – $6,000 | N/A | Mid-to-premium. Greenstar series popular. |
| Peerless | $3,500 – $4,000 | $3,600 – $5,500 | $3,500 – $5,000 | Value. American-made cast iron. |
| System 2000 | N/A | $5,000 – $9,000 | $6,000 – $9,000 | Premium. Unique multi-pass design. |
| Williamson | $3,400 – $3,800 | $4,000 – $5,000 | $4,200 – $4,500 | Value. Popular in Northeast. |
| New Yorker | $3,400 – $4,800 | $4,000 – $5,500 | $3,200 – $5,200 | Value. Strong oil lineup. |
We recommend brands based on your heating needs, not manufacturer incentives. The best brand for your home depends on your fuel type, distribution system, budget, and how you prioritize upfront cost vs. long-term efficiency. Visit our brands page for detailed reviews of each manufacturer.
A complete boiler replacement quote should itemize everything. Here is what a typical installation includes and the approximate cost contribution of each component.
Our quotes include the boiler, all labor, standard piping and venting connections, removal of the old unit, permit fees, and a post-installation inspection. Additional costs may apply for chimney relining, extensive piping modifications, fuel conversions, or electrical panel upgrades. Every quote is written and itemized. For more details on the installation process, see our boiler installation page.
Your home size determines the heating capacity (BTU output) your boiler needs, which directly affects cost. Larger homes need more powerful boilers. Long Island falls in a cold climate zone requiring approximately 40 to 50 BTU per square foot, though insulation quality, window area, and ceiling height also factor in.
| Home Size | Approx. BTU Needed | Standard Gas Installed | Condensing Gas Installed |
|---|---|---|---|
| Under 1,200 sq ft | 48,000 – 60,000 | $5,900 – $7,900 | $7,000 – $10,000 |
| 1,200 – 1,800 sq ft | 60,000 – 90,000 | $6,400 – $7,900 | $8,000 – $9,000 |
| 1,800 – 2,500 sq ft | 90,000 – 125,000 | $7,900 – $8,400 | $9,000 – $10,000 |
| 2,500 – 3,500 sq ft | 125,000 – 175,000 | $8,400 – $9,900 | $9,000 – $11,000 |
| Over 3,500 sq ft | 175,000+ | $9,000+ | $10,000+ |
These are estimates. The only way to determine the right boiler size for your home is a professional heat loss calculation that accounts for insulation, windows, ceiling height, and other variables. We perform this calculation as part of every free in-home assessment. Never accept a quote from a contractor who sizes your new boiler by simply matching the old one. Homes change over time, and many older systems were oversized.
Beyond the boiler type and brand, several factors can push your total cost higher or lower.
Gas, oil, steam, hot water, combi, or electric. Gas-to-gas swaps are least expensive. Fuel conversions (oil to gas, boiler to heat pump) add $2,000 to $8,000 or more.
Higher AFUE means higher upfront cost but lower fuel bills. A 95% AFUE condensing unit costs $1,900 to $6,400 more than an 80% AFUE standard unit.
Straightforward same-type swap is cheapest. Piping modifications, venting changes, chimney relining, or relocating the boiler add labor hours and materials.
Standard boilers use an existing chimney. Condensing boilers need PVC venting ($200 to $800). A deteriorated chimney may need relining ($1,900 to $2,500).
Permits are required in both Nassau and Suffolk County ($75 to $200). Older homes may need code upgrades to meet current requirements.
Switching from oil to gas requires decommissioning the old tank. Above-ground removal costs $700 to $1,500. Underground removal costs $2,000 to $3,000+.
Connecting to an existing gas line is typically included. Running a new gas line from the street costs $0 to $2,000 depending on whether the gas company provides the hookup.
Beyond the boiler itself, some installations require related work that adds to the total project cost.
| Additional Work | Cost Range | When It Applies |
|---|---|---|
| Chimney Relining | $1,900 – $2,500 | Deteriorated chimney or liner, or upgrading from oil to gas |
| Oil Tank Removal (above ground) | $700 – $1,500 | Oil to gas conversion |
| Oil Tank Removal (underground) | $2,000 – $3,000+ | Underground tanks, potential soil testing |
| New Gas Line | $0 – $3,500 | No existing gas service |
| Electrical Panel Upgrade | $1,000 – $3,000 | Electric boilers, heat pumps |
| New Thermostat | $85 – $300 | Upgrading to smart thermostat recommended |
| Indirect Water Heater | $1,600 – $3,000 | Replacing water heater at same time |
| Piping Modifications | $700 – $2,000 | Changing boiler location, extensive repiping |
| Zoning System | $1,700 – $4,500 | Adding zone valves for room-by-room control |
This is one of the most common questions we hear. The answer depends on your fuel costs, how long you plan to stay in your home, and whether you qualify for rebates.
A standard-efficiency gas boiler (80-85% AFUE) costs approximately $7,000 to $8,900 installed. A high-efficiency condensing gas boiler (95-98% AFUE) costs approximately $8,000 to $12,000 installed. The difference of $3,000 to $6,000 is offset by fuel savings of 20-35% per year. For a typical Long Island home spending $1,500 to $2,000 per year on gas heat, that translates to roughly $300 to $700 in annual savings.
| Factor | Standard (80-85% AFUE) | Condensing (95-98% AFUE) |
|---|---|---|
| Installed Cost | $7,900 – $8,900 | $8,000 – $14,000 |
| Annual Fuel Cost (avg) | $1,500 – $2,000 | $1,000 – $1,400 |
| Annual Savings | Baseline | $300 – $700/year |
| Payback Period | N/A | 5 – 8 years |
| Venting | Chimney (existing) | PVC (new install, no chimney needed) |
| Lifespan | 20 – 30 years | 15 – 20 years |
| Rebate Eligible | Usually not | Yes (National Grid, federal) |
For most Long Island homeowners who plan to stay in their home for 10 or more years, a high-efficiency condensing boiler is worth the extra cost. The fuel savings, rebate eligibility, and environmental benefits typically make the math work. However, if you are on a tight budget or plan to sell in the near future, a standard-efficiency unit from a reliable brand like Weil-McLain or Burnham is a perfectly sound investment that will provide decades of reliable service.
Switching fuel types adds significant cost to a boiler replacement project, but can produce substantial long-term savings. Here are the most common conversions on Long Island.
| Conversion Type | Additional Cost | Estimated Annual Savings | Typical Payback |
|---|---|---|---|
| Oil to Gas | $3,000 – $6,000 above gas boiler cost | $800 – $1,500/year | 3 – 5 years |
| Boiler to Heat Pump | $8,000 – $20,000 above boiler cost | $500 – $1,200/year | 8 – 15 years |
| Boiler to Furnace | $7,000 – $18,000 (includes ductwork) | Varies | Varies |
Oil to gas is the most common and most financially straightforward conversion on Long Island. Natural gas costs significantly less per BTU than heating oil, and the savings typically cover the conversion cost within a few years. See our oil to gas conversion page for a detailed breakdown.
Several programs can reduce your out-of-pocket cost for a new boiler. We help every customer identify and apply for all available incentives.
National Grid Rebates: Rebates of $300 to $1,000+ for high-efficiency gas boiler installations, depending on AFUE rating and model.
PSEG Long Island: Incentives for energy-efficient heating equipment for customers in the PSEG service territory.
Federal Tax Credits: The federal 25C energy efficiency tax credit provides 30% of project cost up to $600 for qualifying high-efficiency boilers (95%+ AFUE) installed in your primary residence.
HEAP Assistance: The Home Energy Assistance Program provides grants for heating equipment replacement to eligible low-income households.
Financing: We offer low-interest and 0% interest financing plans for qualified applicants. Visit our financing page for details.
For a complete guide to every available program, see our rebates and incentives page.
Here are practical ways to reduce your total cost without sacrificing quality.
Schedule in the off-season. Late spring through early fall (May to September) is the slow season for boiler work. Scheduling and pricing can be more flexible when demand is lower. Plan ahead rather than waiting for an emergency.
Right-size the boiler. An oversized boiler wastes fuel and costs more upfront. A proper heat loss calculation ensures you buy only the capacity your home actually needs.
Apply for every rebate. Utility rebates and federal tax credits can offset $600 to $1,500 or more of the cost of a high-efficiency installation.
Compare itemized quotes. Get at least two or three written, itemized estimates. Compare the brand, model number, efficiency rating, warranty, and exactly what is included. The lowest price is not always the best value. Read our guide to choosing a contractor for what to look for in a quote.
Keep the same fuel type. Replacing like for like (gas to gas, oil to oil) is the least expensive option. If you are considering a fuel conversion, factor in both the additional upfront cost and the long-term fuel savings to determine whether it makes financial sense.
If one quote is dramatically lower than others, ask why. Common shortcuts include undersizing the boiler, skipping permits, not performing a heat loss calculation, or using unlicensed labor. Unpermitted work can void your homeowner insurance and create serious problems at resale. A proper installation by a licensed contractor will always cost more than a shortcut, but it protects your investment and your family.
Every home is different, and online price ranges can only narrow the window. The only way to know your exact cost is a free in-home assessment where we inspect your current system, perform a heat loss calculation, discuss your options, and provide a detailed written estimate.
Call us at (631) 860-6681 or schedule your free estimate online. No pressure, no obligation.
Schedule a free in-home assessment. We will inspect your system, calculate your heating needs, and provide a detailed written estimate with no obligation and no pressure.