Boiler Installation for Long Island Radiant Heat
Gas and oil boiler installation for hydronic radiant heating systems. Even, quiet, draft-free heat for your Long Island home. 10-year heat exchanger warranty. Free in-home estimates.
Boiler Installation & Replacement for Nassau & Suffolk County Homes
Many Long Island homes rely on boilers for heating, especially homes built before 1970 that use hydronic radiant heat distributed through baseboard radiators, cast iron radiators, or in-floor radiant tubing. If your boiler is aging, inefficient, or failing, Island Comfort HVAC provides expert boiler replacement and new installation across Nassau and Suffolk County.
We install gas boilers from Carrier, Weil-McLain, Burnham, and Navien, and oil boilers from Weil-McLain and Burnham. For homeowners looking to convert from oil to gas, we handle the entire project: boiler replacement, gas line installation, oil tank decommissioning coordination, and chimney liner removal or capping.
Modern high-efficiency condensing boilers achieve AFUE ratings of 95% to 98%, compared to 80% to 85% for many older boilers still operating in Long Island homes. This means 15% to 18% of your current heating fuel cost is being wasted as exhaust heat. Over a typical Long Island heating season, upgrading to a condensing boiler can save $500 to $1,500 per year in fuel costs depending on your home size and current fuel type.
Boiler systems deliver heat differently than forced-air furnaces. Instead of blowing heated air through ducts, a boiler heats water and circulates it through radiators or radiant floor tubing. This produces even, quiet, draft-free heat that many homeowners prefer. Radiant heat also does not distribute dust and allergens the way forced-air systems do, making it a better choice for allergy sufferers.
Our boiler installations include the boiler unit, expansion tank, air separator, circulator pump(s), zone controls, a new thermostat for each zone, all piping connections, venting, and system commissioning. For gas boilers, we handle the gas line connection. For oil boilers, we connect to your existing oil supply line and verify the tank condition.
We also specialize in boiler system upgrades: adding zones for better comfort control, converting from baseboards to in-floor radiant, installing indirect-fired water heaters that use the boiler for domestic hot water, and integrating outdoor reset controls that automatically adjust boiler water temperature based on outdoor conditions for maximum efficiency.
Boiler Installation & Replacement Features
Radiant Heat Specialists
We design and install hydronic systems including baseboards, cast iron radiators, and in-floor radiant tubing.
95-98% AFUE Efficiency
High-efficiency condensing boilers that convert nearly all fuel into usable heat, saving hundreds annually.
Multi-Zone Capability
Independent temperature control for different areas of your home using zone valves and separate thermostats.
Oil-to-Gas Conversion
Complete conversion service including boiler replacement, gas line installation, and oil tank coordination.
10-Year Heat Exchanger Warranty
Manufacturer warranty on the heat exchanger, the most expensive component in the boiler.
Indirect Water Heating
Integrate an indirect-fired water heater with your boiler for efficient, high-capacity domestic hot water.
Our Boiler Installation Process
System Assessment
We evaluate your existing boiler, distribution system (radiators, baseboards, or radiant), piping, and zones.
Equipment Selection
We recommend the right boiler size and type based on your home’s heat loss calculation and distribution system.
Professional Installation
Our crew removes the old boiler and installs the new unit with all piping, venting, controls, and zone valves.
System Purging & Commissioning
We purge air from the system, check for leaks, verify water pressure, and commission the boiler at proper firing rates.
Zone Testing & Walkthrough
We test every heating zone, verify thermostat operation, and walk you through the system controls and maintenance.
Same crew, start to finish.
No subcontractors. The team that starts your project is the team that finishes it.
Boiler Installation Pricing on Long Island
Boiler installation on Long Island costs between $5,000 and $12,000. A standard gas boiler replacement with existing piping and zones runs $5,000 to $7,500. A high-efficiency condensing boiler with PVC venting and zone upgrades costs $7,500 to $10,000. Premium installations with multi-zone radiant systems, indirect water heater, and outdoor reset controls range from $10,000 to $12,000.
Oil-to-gas conversions add approximately $1,500 to $3,000 to the project for gas line installation, chimney modifications, and coordination with the gas utility. The ongoing fuel savings from converting to gas typically offset this additional cost within 2 to 3 years.
We offer 0% financing for 18 months on all boiler installations. PSEG rebates may apply for qualifying high-efficiency gas boilers.
What Long Island Homeowners Say
“James came out the same day we called. Diagnosed the issue in 20 minutes, had our AC back running within the hour. His crew installed our whole system four years ago and it has been flawless. Cannot recommend enough.”
“We got four quotes for central air. Island Comfort was the only company that showed up on time, explained every option without pressure, and gave us a written quote the same visit. System runs perfectly. Fair price.”
“Our furnace died on the coldest night in January. James had a tech at our house by 9 PM and we had heat back by midnight. They did not gouge us on the emergency call either. Ended up replacing the whole furnace the following week. Professional start to finish.”
Common Boiler Installation Questions
How long does a boiler last on Long Island?
Should I convert from oil to gas?
What is the difference between a boiler and a furnace?
Can I add zones to my existing boiler system?
Do you install in-floor radiant heating?
Other Services You May Need
Ready to Schedule Your Boiler Installation?
Free estimates. Honest pricing. Mon–Sat, 7 am to 7 pm.