Standard and high-efficiency gas boiler installation across Nassau and Suffolk County. Licensed, permitted, and backed by over 45 years of experience.
Natural gas is the most common heating fuel on Long Island, and a gas boiler replacement is the most frequently requested service we perform. Whether your existing unit has reached the end of its lifespan, you are dealing with rising repair costs, or you want to upgrade to a high-efficiency condensing model, we handle every step of the process from the initial assessment through final inspection.
A gas boiler heats water and distributes it through your home via baseboard radiators, cast iron radiators, or radiant floor tubing. Modern gas boilers come in two main categories: standard efficiency models rated at 80-89% AFUE that use a traditional chimney for venting, and high-efficiency condensing models rated at 95-98% AFUE that use PVC venting and recover additional heat from exhaust gases. The right choice depends on your budget, how long you plan to stay in your home, and whether your existing venting can accommodate a condensing unit.
We install gas boilers from all major manufacturers, including Weil-McLain, Navien, Burnham, Buderus, Bosch, and Peerless. We recommend brands and models based on your heating needs and budget, not manufacturer incentives. Every installation includes a professional heat loss calculation, proper permit from your local building department, and a post-installation inspection to verify code compliance.
Understanding the difference between these two categories is the most important decision you will make when replacing a gas boiler.
| Feature | Standard Efficiency | High-Efficiency Condensing |
|---|---|---|
| AFUE Rating | 80 – 89% | 95 – 98% |
| Installed Cost | $7,500 – $9,500 | $8,000 – $14,000 |
| Equipment Only | $4,800 – $5,500 | $4,500 – $7,500 |
| Venting | Traditional chimney | PVC pipe (direct vent) |
| Annual Fuel Savings | Baseline | 20 – 35% less than standard |
| Lifespan | 20 – 30 years | 15 – 20 years |
| Rebate Eligible | Usually not | Yes (National Grid, federal) |
| Best For | Budget-conscious, shorter stay | Long-term savings, 10+ year stay |
A condensing boiler recovers heat from exhaust gases that a standard boiler sends up the chimney. This additional heat recovery is what produces the 95-98% efficiency rating. Condensing units require PVC venting (no chimney needed) and a drain for acidic condensate. They cost more upfront but the fuel savings and rebate eligibility typically offset the difference within 5 to 8 years. For a deeper comparison of all boiler types, see our boiler types comparison guide.
| Brand | Standard (Installed) | Condensing (Installed) | Highlights |
|---|---|---|---|
| Weil-McLain | $7,400 – $9,500 | $8,500 – $9,800 | Cast iron workhorse. EG, CGa, WM97+, Evergreen series. Widely available parts. |
| Navien | N/A (condensing only) | $3,000 – $5,000 | Wall-hung, compact. NHB and NCB series. WiFi-enabled. 95% AFUE. |
| Burnham | $7,600 – $8,200 | $8,000 – $9,500 | Broad lineup. Series 2, Alpine, K2. Reliable cast iron. |
| Buderus | $7,900 – $8,500 | $7,500 – $8,500 | German engineering. GB142 and GB162 series. Premium tier. |
| Bosch | N/A (condensing only) | $7,500 – $8,000 | Greenstar series. Quiet operation. Wall-mounted. 95% AFUE. |
| Peerless | $7,500 – $8,500 | $8,200 – $8,500 | American-made cast iron. PureFire series. Value-priced. |
All prices shown are equipment only. Total installed cost depends on the model, BTU rating, and installation complexity. For a complete cost breakdown, see our boiler replacement cost guide.
We calculate your exact BTU needs based on home size, insulation, windows, and Long Island climate.
Complete disconnection, removal, and proper disposal of your existing gas boiler.
All standard piping connections and venting. PVC venting for condensing units.
We pull the required permit and schedule the building department inspection.
Every zone is tested, safety controls are verified, and combustion is analyzed.
We show you how to operate your new system and register your warranty.
National Grid Rebates: $300 to $1,000+ for high-efficiency gas boiler installations, depending on AFUE rating and model. National Grid is the primary gas utility for most of Long Island.
Federal 25C Tax Credit: 30% of project cost up to $600 for qualifying high-efficiency boilers (95%+ AFUE) installed in your primary residence.
Financing: Low-interest and 0% interest plans available for qualified applicants. See our financing options for details.
We help you identify and apply for every rebate and incentive your installation qualifies for. Visit our rebates and incentives guide for current programs.
A well-maintained gas boiler can last 15 to 30 years, but efficiency declines with age. Here are common indicators that replacement makes more sense than continued repair:
Your boiler is over 15 years old and repair frequency is increasing. Your heating bills have risen significantly despite similar usage patterns. You are spending more than 50% of the cost of a new boiler on repairs in a single year. You see a yellow or flickering flame instead of a steady blue flame. Your carbon monoxide detector has alarmed. There are visible signs of corrosion, leaks, or cracking on the heat exchanger. The system cannot maintain consistent temperatures throughout your home.
For a detailed guide, see our 10 signs it is time to replace your boiler or use our repair vs. replace decision guide.
Every gas boiler replacement begins with a free in-home assessment. We inspect your current system, perform a heat loss calculation, discuss your options and budget, 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 system, calculate your heating needs, and provide a detailed written estimate with no obligation.