Boilers on Long IslandBoiler installation on Long Island — done right the first time.
Boiler installation across Long Island — steam, hot-water, condensing, and combi. Licensed installers who understand near-boiler piping, radiator systems, and oil-to-gas conversions in Nassau and Western Suffolk.
- Steam & hot-water systems
- Condensing & combi boilers
- Oil-to-gas conversions
- Annual service plans
Boiler Repair & Installation across Nassau & Western Suffolk
Boiler installation on Long Island from licensed technicians who specialize in steam, hot-water, condensing, and combi boilers. Serving Nassau and Western Suffolk with oil-to-gas conversions, National Grid rebates up to $1,500, and pre-1950 home expertise. Weil-McLain, Burnham, Lochinvar, and Navien installs typically $6,500–$16,500.
Boiler installation on Long Island is not a plug-and-play swap. Nassau and Western Suffolk have thousands of pre-1950 homes still heated by steam and hot-water boilers — and the difference between a 30-year install and a 10-year headache is near-boiler piping done to manufacturer spec. We do it right.
Common signs you need boilers
Catching these early prevents emergency calls and bigger repair bills down the road.
Failed circulator, stuck zone valve, low water cutoff trip, or air-bound system.
Wet steam from improper near-boiler piping or trapped condensate. Fixable with proper service.
Failed pressure-relief valve, expansion tank issue, or — worst case — cracked sections.
Thermocouple, gas valve, or draft issue. Common on older atmospheric units.
Aging atmospheric boiler running at 65–75% efficiency vs. 95%+ on modern condensing units.
What's typically going wrong
The classic. 80–82% AFUE. 25–30 year lifespan. Bulletproof but inefficient by today's standards.
95%+ AFUE. Sealed combustion, PVC venting. 15–20 year lifespan. 20–30% fuel savings.
Heat your home AND make domestic hot water from one wall-hung unit. Saves space, no tank needed.
Old gravity systems. Specialized — wrong service = banging pipes for years. We do this right.
Three tiers — same flawless install
Every quote includes Manual-J sizing, permits, removal of your old system, and our lifetime workmanship guarantee.
- Weil-McLain CGa or Burnham ESC
- Vents up existing chimney
- 25–30 year typical lifespan
- Best for steam-system retrofits
- No electrical condensate needed
- Weil-McLain Evergreen or Lochinvar Knight
- Stainless steel modulating heat exchanger
- PVC sealed-combustion direct vent
- Outdoor reset & smart controls
- National Grid rebate filed for you
- Navien NCB-H or Lochinvar Noble Combi
- Replaces boiler AND water heater
- Endless on-demand domestic hot water
- Saves 8–12 sq ft of basement space
- Maximum National Grid + NYSERDA rebates
Let us file every form for you
Boilers stack utility, state, and conversion incentives. Most homeowners qualify for $1,500–$3,500 in combined savings — and oil-to-gas conversions can layer in another $2,000+. We file every form for you.
Eligibility depends on equipment, household income, and current program funding. We confirm exact amounts during your free in-home quote.
Heat the old house — pay over time
Through Synchrony Home — the same financing trusted by HVAC dealers nationwide. Soft credit pull only, decision in under a minute.
- Decision in 60 seconds
- $0 down on approved credit
- Synchrony Home — trusted nationally
- No prepayment penalties
Repair or replace?
Boiler is under 18 years old, sections are sound, and the repair is under $1,800.
Sections are leaking, unit is 25+ years old, or efficiency is under 80%.
Gas service is on your street and you plan to stay 5+ more years.
What's included in every boiler installation
Every visit follows the same documented checklist — so nothing gets skipped and you get a written report at the end.
Book a visitLong Island boilers cost ranges
Real numbers based on actual installs across Nassau and Western Suffolk. Final pricing depends on your home — we always quote in writing before any work begins.
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Boiler diagnostic
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$129–$229 |
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Circulator pump replacement
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$485–$880 |
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Zone valve replacement
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$340–$560 each |
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New atmospheric cast-iron boiler
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$6,500–$9,500 |
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New condensing boiler (gas)
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$9,500–$14,500 |
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Combi boiler install
Replaces boiler + water heater
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$11,000–$16,500 |
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Oil-to-gas conversion (full)
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$12,500–$19,500 |
Pricing reflects typical Long Island ranges. Equipment, complexity, and incentives may increase or reduce your final cost.
What to expect, step by step
We evaluate the existing system, near-boiler piping, venting, and chimney condition.
Heat-loss calc to size the new boiler properly — oversizing wastes fuel and shortens life.
Old unit removed, new boiler set, near-boiler piping done correctly per manufacturer manual.
Combustion analyzed, system balanced, registered for full manufacturer warranty.
Long Island homes, treated like our own
Every boilers job starts with shoe covers, drop cloths, and a walk-through with the homeowner. We document with photos, explain what we found, and quote in writing — no surprises.
- Background-checked, uniformed technicians
- Photos of every issue, before & after
- Flat-rate pricing approved before we start
Every major HVAC brand, serviced and installed
The Long Island standard. CGa atmospheric and Evergreen condensing — proven cast-iron and stainless heat exchangers with excellent parts availability across Nassau and Suffolk.
ESC and Alpine series — American-made cast-iron and condensing boilers. Strong choice for steam retrofits and traditional hot-water systems.
Knight wall-hung condensing and Noble combi units — premium modulating performance with outdoor reset and Smart System controls. Top efficiency play.
NCB-H combi boilers — best-in-class on-demand hot water flow rates with compact wall-hung footprint. Ideal for space-constrained basements and condo conversions.
Boilers across Long Island
We dispatch from Levittown to every town in Nassau and Western Suffolk. Tap your town for local install notes and direct booking.
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- →Boilers in Mineola
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- →Boilers in North Massapequa
- →Boilers in North Wantagh
- →Boilers in Old Bethpage
- →Boilers in Oyster Bay
- →Boilers in Plainedge
- →Boilers in Plainview
- →Boilers in Rockville Centre
- →Boilers in Salisbury
- →Boilers in Seaford
- →Boilers in South Farmingdale
- →Boilers in Syosset
- →Boilers in Uniondale
- →Boilers in Wantagh
- →Boilers in West Hempstead
- →Boilers in Westbury
- →Boilers in Williston Park
- →Boilers in Wyandanch
Boilers questions, answered
Boiler installation on Long Island typically runs $6,500–$9,500 for an atmospheric cast-iron boiler, $9,500–$14,500 for a high-efficiency condensing boiler, and $11,000–$16,500 for a combi boiler that replaces both your boiler and water heater. Oil-to-gas conversions run $12,500–$19,500. National Grid rebates up to $1,500 apply to qualifying condensing units.
Most Long Island boiler installations take 1–3 days. A straight cast-iron or condensing replacement in a home with existing gas service is usually done in a single day. Oil-to-gas conversions and combi installs take 2–3 days because we're also removing the tank, running new gas line, and re-doing near-boiler piping.
Yes — steam is one of our specialties. Long Island has thousands of pre-1950 homes with original steam systems and most contractors won't touch them. We service, repair, and replace every type.
Atmospheric cast-iron boilers commonly last 25–30 years. High-efficiency condensing units typically last 15–20 years. Combi boilers run 12–18 years depending on water quality.
If natural gas is available on your street, conversion typically pays back in 4–7 years on fuel savings. National Grid offers conversion incentives that often cover $2,000+ of the cost.
A combi (combination) boiler heats your home AND produces domestic hot water on demand from a single compact wall-hung unit — eliminating your separate water heater and tank.
Banging in steam systems is almost always caused by improper near-boiler piping installed by someone unfamiliar with steam — trapped condensate slams against incoming steam. We can fix it.
$6,500–$9,500 for an atmospheric cast-iron boiler, $9,500–$14,500 for a high-efficiency condensing unit, and $11,000–$16,500 for a combi boiler with on-demand hot water.
Yes — National Grid offers up to $1,500 on qualifying condensing boilers, plus NYSERDA whole-home efficiency programs. We file all paperwork at no extra charge.
Yes — we service all oil-fired boilers including Beckett and Carlin burner units. Annual cleaning is critical for oil systems to maintain efficiency and reliability.
Go beyond the equipment.
Pair boilers with one of our whole-home comfort solutions — designed for Long Island climates, ductwork, and rebate stacks.
Whole-Home Zoned Comfort
End hot upstairs, cold downstairs with ductless, ducted zoning, or variable-capacity heat pumps.
Indoor Air Quality
MERV-13/16 filtration, whole-home dehumidifiers, UV-C, and ERV ventilation systems.
Rebates & Financing
Stack PSEG, NYSERDA, and federal IRA incentives with $0-down Synchrony financing.
Need boilers on Long Island?
Talk to a real Long Island technician — same-day appointments, flat-rate pricing, and a 1-year warranty on every visit.