Long Island Boiler Experts: Repair, Replace, Install & Tune-Up
A boiler is the heart of most older Long Island homes. When it stops working, hisses, leaks, or runs constantly without heating evenly, the whole house feels it. All Island Comfort has been servicing residential boilers across Suffolk and Nassau Counties since 2004, including steam and hot-water systems, gas-fired and oil-fired units, and the new generation of high-efficiency condensing boilers.
We handle everything from a quick repair to a full system replacement, plus tune-ups, conversions from steam to hot-water, and full oil-to-gas conversions. Family-owned, fully licensed, and never subcontracted.
- Boiler Repair (All Brands & Fuel Types)
- Boiler Replacement & New Installation
- Annual Boiler Tune-Ups & Maintenance Plans
- High-Efficiency Condensing Boiler Installation
- Steam Boiler Repair & Service
- Hot-Water Boiler Repair & Service
- Steam-to-Hot-Water Conversions
- Oil-to-Gas Boiler Conversions
- Indirect Water Heater Pairings
- 24/7 Emergency Boiler Repair
Call 631-591-2289 any time for fast boiler service on Long Island, or request a written estimate online.
No Heat Today?
Most no-heat boiler calls are dispatched within the hour. Our trucks carry common parts, so most repairs are done in a single visit.
Call 631-591-2289Types of Boilers We Service & Install
Boilers come in a few major flavors, and each has different parts, controls, and quirks. We work on all of them across Long Island:
Hot-Water (Hydronic) Boilers
The standard for new installations. Heats water to roughly 140-180°F and circulates it through baseboard, radiators, or radiant tubing. More efficient than steam, easier to zone, and the foundation of most modern Long Island heating systems.
Steam Boilers
Common in older Long Island homes built before the 1960s. Boils water and sends steam through pipes to cast-iron radiators. We service every common steam-boiler issue: low water cutoffs, pigtails, gauge glasses, header piping, and pressure-trol controls. We also install replacement steam boilers from Burnham, Weil-McLain, Peerless, and Crown when full conversion isn't a fit.
Cast-Iron Boilers
Tough, long-lived, and forgiving. A well-maintained cast-iron boiler can last 30+ years. Heavy and slower to respond than newer designs, but a workhorse for many Long Island basements.
High-Efficiency Condensing Boilers
Modern condensing boilers (95% AFUE+) capture heat from exhaust gases that older boilers throw away. Lower fuel bills, smaller footprint, often eligible for NYS Clean Heat rebates and federal tax credits. Brands we install: Buderus, Lochinvar, Navien, Bosch, Burnham high-efficiency lines.
Combi (Combination) Boilers
One unit handles both home heating and on-demand hot water. Great fit for smaller homes, condos, and tight mechanical rooms. We install Navien, Rinnai, Bosch, and Triangle Tube combi units.
Oil-Fired Boilers
Common on Long Island where natural gas mains don't reach. Pair with a residential oil burner. We service the boiler and the burner together. Learn about our Long Island oil burner service.
Boiler Repair
Whether your boiler isn't firing, won't hold pressure, leaks at the relief valve, or runs constantly without heating evenly, our techs diagnose and fix any boiler issue across Long Island, including:
- Boiler Won't Fire / No Heat
- Burner Lockouts & Reset Trips
- Pressure Too High or Too Low
- Leaking Relief Valve
- Leaking Around the Boiler Body
- Cracked Sections (Cast-Iron)
- Failed Circulator Pump
- Stuck Zone Valves
- Air-Bound Zones / Uneven Heat
- Knocking, Banging, or Kettling Noises
- Failed Aquastat or Thermostat
- Failed Low-Water Cutoff (Steam)
- Pigtail or Gauge Glass Issues (Steam)
- Sediment in the Bottom of the Boiler
- Combustion / Soot Problems
- Expansion Tank Failure
- Backflow Preventer Issues
- Frequent Short Cycling
- High Fuel Bills with No Other Cause
- Boiler Smells (Gas, Oil, or Burning)
How much will your boiler repair cost? A soft quote can usually be given over the phone, but accurate estimates are done in person, in writing, before any work starts. Cost depends on the type of repair, parts required, and labor.
For boiler emergencies on Long Island, call 631-591-2289 any hour, day or night.
"Our 22-year-old Burnham boiler died on a Tuesday in February. They had a tech onsite the same day, gave us three replacement options with real numbers, and had a new high-efficiency Buderus running by Thursday afternoon. Heating bill is already down."
Boiler Replacement & New Installation
Replacing a Long Island boiler is one of those jobs where the wrong contractor costs you for the next 20 years. Pipe sizing, venting, near-boiler piping, and combustion-air calculations all matter. We install steam and hot-water boilers, gas and oil-fired, including high-efficiency models.
Signs you should replace rather than repair:
- Boiler Is 15 to 20+ Years Old
- Repairs Are Recurring or Expensive
- Visible Leaks From the Boiler Body
- Cracked Heat Exchanger Sections
- Rising Fuel Bills with No Other Cause
- Inadequate or Uneven Heat in Some Zones
- Old Mid- or Low-Efficiency Unit (under 80% AFUE)
- Manufacturer Parts Are No Longer Available
- You Want to Combine Heat and Hot Water (Combi)
- You're Switching Fuel Sources (Oil to Gas)
Cost factors for new installation on Long Island:
- Type (Steam, Hot-Water, Combi)
- Fuel Source (Natural Gas, Propane, Oil)
- Size in BTU (Based on Heat-Loss Calc)
- Efficiency Rating (AFUE)
- Brand & Model
- Required Venting (B-Vent, Power, Direct)
- Near-Boiler Piping & Zoning Changes
- Permits & Inspections
- Removal & Disposal of Old Unit
- Available Rebates & Tax Credits
We do real heat-loss calculations and size every install correctly. No oversized boilers that short-cycle. Call 631-591-2289 for a free in-home estimate.
Annual Boiler Tune-Ups & Maintenance
Skipping annual boiler service is the single most common cause of mid-winter breakdowns on Long Island. Our annual boiler tune-up takes about 60 to 90 minutes and includes:
- Inspect & clean burner assembly
- Check and adjust gas pressure (gas units)
- Replace nozzle, oil filter & pump strainer (oil units)
- Test & clean ignition / pilot
- Check flue, vent, and combustion-air
- Run combustion analysis (CO, CO2, draft, efficiency)
- Inspect heat exchanger for cracks or scale
- Test relief valve and expansion tank
- Check circulator pump & zone valves
- Test aquastat and thermostat
- Test low-water cutoff (steam units)
- Check water level and treatment
- Bleed air from zones if needed
- Visual leak inspection on all near-boiler piping
- Provide written report with current condition and any flagged issues
Maintenance plans bundle the annual tune-up with priority scheduling and discounts on parts and labor. Call 631-591-2289 for current plan pricing.
Boiler Conversions: Steam to Hot-Water & Oil to Gas
Two conversion projects come up regularly with Long Island homeowners:
Steam to Hot-Water Conversion
Replaces the entire steam boiler and steam piping with a modern hot-water boiler and hydronic distribution. The benefits when it's a fit: dramatically higher efficiency, true zoning, much quieter operation, and faster temperature response. We evaluate the existing piping, radiators, and floor plan to tell you whether conversion makes financial sense for your home.
Oil to Gas Boiler Conversion
If natural gas is available on your street, switching from oil to gas typically saves 20 to 40 percent on annual heating costs. We handle the new boiler, the gas piping inside the house, the venting, the permits, and the old oil tank removal as one project. Full oil-to-gas conversion details here.
Boiler Brands We Install & Service
We work on every major residential boiler brand. Common manufacturers we install or service across Long Island:
- Buderus
- Weil-McLain
- Burnham
- Peerless
- Crown
- Lochinvar
- Navien
- Bosch
- Rinnai
- Triangle Tube
- Slant/Fin
- Utica
- Dunkirk
- Williamson
- NTI
- HTP
- Viessmann
- Carrier
If you're not sure what brand you have, send a photo of the data plate to our office and we'll tell you. Call 631-591-2289.
Why Long Island Chooses Us for Boiler Work
Boiler installations are unforgiving. The wrong size, wrong piping, or skipped combustion-analysis step can cost you for the next 20 years. Here's why Long Island homeowners pick All Island Comfort:
- Family-Owned in Wading River Since 2004
- NATE-Certified Boiler Technicians
- Real Heat-Loss Calculations on Every Install
- Steam & Hot-Water Specialists, Not Generalists
- NYS Clean Heat & Federal Rebate Paperwork Handled
- Up-Front Pricing in Writing
- Same-Day Service for Most Repairs
- 24/7 Emergency Dispatch
"They sized our new boiler properly, did a real heat-loss calc, and installed a Lochinvar that runs quieter than the old one and cut our gas bill almost in half. Followed up after install to make sure everything was perfect."
How It Works: Three Easy Steps
- 1Call or Send a Photo
Tell us the symptom (no heat, leak, age, etc.) and what you have. A photo of the boiler and its data plate speeds the quote.
- 2Get a Same-Day Visit or Estimate
Most repair calls happen the same day. Replacement and conversion estimates are done by phone, video, or in-home.
- 3The Work Gets Done
Most repairs are single-visit. Most full boiler replacements are 1 to 2 days. Steam-to-hot-water and oil-to-gas conversions take 2 to 5 days depending on the scope.
Related Long Island Services
Boiler work often pairs with other equipment in your home. Here's what customers commonly book together: