The failed component
Vents, thermocouples and relief valves are small. Gas valves, low-water cutoffs and circulators are mid-range. Ignition modules, sections and burner assemblies are the big ones.
Boiler Repair NYC | NYC Plumber Co
No heat, banging radiators, a boiler that keeps shutting itself down - licensed steam and hot water boiler repair for brownstones, walk-ups and multifamily buildings across NYC.
Confidential · Emergencies get a call back within minutes, everything else the same day
No hidden feesCards acceptedLicensed & insuredSame-day service in NYC
Licensed boiler repair in NYC from NYC Plumber Co. Steam and hydronic, gas and oil, 24/7 through heat season.
NYC Plumber Co repairs and replaces boilers in one-family homes, brownstones, walk-ups and multifamily buildings across Manhattan, Brooklyn, Queens and the Bronx. Our plumbers know one-pipe steam, two-pipe steam, hot water baseboard and radiant, and the gas and oil burners that run them. Call (929) 717-4784 or request a free estimate.
Boiler Repairs Built for NYC Steam and Hot Water Systems
New York City heats itself differently from the rest of the country. A huge share of the housing stock, prewar especially, runs on one-pipe steam - a cast iron boiler in the basement pushing steam up a riser to radiators that hiss and clank and heat the block. Newer brownstone renovations and most single-family houses in Queens and the Bronx run hot water systems with circulator pumps and zone valves. Both fail in their own ways, and both fail in January.
NYC Plumber Co repairs both. Our plumbers stock low-water cutoffs, pressuretrols, gas valves, thermocouples, ignition modules, circulator pumps, zone valves, relief valves, expansion tanks, main vents and radiator vents. A large part of steam work is correcting things a previous installer got wrong: near-boiler piping that sends wet steam up the risers, a Hartford loop that was never installed, mains that sag and hold water.
We also handle the paperwork the city attaches to boilers. Pre-inspection service for buildings that need their annual boiler inspection, gas work under a licensed master plumber, and the gas line repair and pressure testing that goes with a burner replacement.
Our Boiler Repair Process, Step by Step
- 01
Triage on the phone
No heat anywhere, no heat on one line or one floor, a leak, a noise, a boiler that fires and then shuts off. Steam or hot water, gas or oil. We dispatch with the right parts.
- 02
Safety and combustion check
Gas odor check, carbon monoxide reading at the boiler, flue and draft inspection, sight glass and pressure gauge read before anything is touched.
- 03
Controls and water
Low-water cutoff tested, pressuretrol or aquastat settings checked, automatic feeder inspected, pigtail cleared. On hot water systems, pressure at the gauge, expansion tank charge, air in the system.
- 04
Burner and ignition
Pilot, thermocouple or flame sensor, gas valve, ignition module. Oil burners get nozzle, electrodes, cad cell and filter.
- 05
Written price
Repair cost in writing. If the boiler is past saving we price a replacement next to it with the sizing explained.
- 06
The repair
Parts replaced, piping corrected where it causes the problem, vents replaced, sections or leaks addressed.
- 07
Run test and balance
Boiler fired through a full cycle, steam observed at the farthest radiator or heat confirmed on every zone, pressure and cutoffs verified, findings written up for the super or the owner.
Boiler Problems Our Plumbers Fix Across New York City
No heat. The boiler is off, the low-water cutoff tripped and the feeder failed, the pressuretrol is stuck, the pilot is out, the gas valve died, or the thermostat wiring finally gave up. On hot water systems the circulator pump is the usual suspect - the motor hums and nothing moves.
Banging and hammering. Water hammer in a steam system is condensate trapped in a main or a radiator with steam slamming into it. Radiators pitched away from the valve, a main that sagged over the decades, a wet return packed with sludge, a steam trap that failed open in a two-pipe system. Loud, and fixable.
Uneven heat. First floor roasting, top floor cold. Main vents that are undersized or dead, radiator vents that never got replaced, a boiler running at 5 psi when one-pipe steam wants under 2. Venting is the whole game in steam, and most buildings have never had it done right.
Surging and short cycling. Water bouncing in the sight glass, the boiler shutting off on low water and then refilling. Dirty water, oil left in the boiler from a repair, wrong near-boiler piping. Skimming and repiping fix it.
Leaks. A cracked cast iron section from cold feed water hitting a hot boiler, a relief valve discharging, a circulator flange, a leaking tankless coil. Some of these are a part. A cracked section on an old boiler is usually a replacement.
What Affects the Cost of Boiler Repair in NYC
Steam versus hot water
Steam work involves more diagnosis. The problem is often in the piping and venting rather than inside the boiler, and finding it takes a plumber who has chased it a few hundred times.
Building size
A 25-unit building's boiler is bigger, the parts are bigger, and the pressure to get it running is bigger. After-hours emergency plumbing rates apply when a building is cold at night during heat season.
Access and the condition of the room
Boiler rooms in prewar buildings are tight, low and sometimes half full of storage. Time spent getting to the boiler is time on the invoice.
Repair versus replacement
A 30-year-old boiler with a leaking section and an obsolete control gets a replacement estimate alongside the repair, sized from the connected radiation and explained.
NYC Heating Rules and Building Conditions We Work Around
Heat season requirements
From October 1 through May 31, NYC landlords must keep apartments at 68 degrees during the day when it is below 55 outside, and at 62 degrees overnight regardless of the outdoor temperature. A dead boiler in a rental is a violation clock running. We treat it that way.
Annual boiler inspections
Many multifamily buildings must have their low-pressure boiler inspected every year and the results filed with the Department of Buildings. We do the pre-inspection service and the repairs the inspector writes up.
Oil and gas conversions
Older buildings on the Upper West Side and in Brooklyn still run on oil. Conversions to gas involve the utility, a new gas service or an upsized line, a burner change and DOB filings. We handle the plumbing side and coordinate the rest.
Chimneys and combustion air
Prewar chimneys deteriorate. Boiler rooms get sealed up during renovations. Both create draft and carbon monoxide problems, and we test for them on every visit.
Preventing and Solving Common Boiler Problems
Annual service before October
Burner cleaned, controls tested, cutoff flushed, vents checked, combustion measured. The cheapest boiler visit you will ever book is the one in September.
Blow down the low-water cutoff
On float-type cutoffs, a weekly blowdown during heat season keeps sludge from jamming the float. Supers know this. Owners of small buildings often do not.
Keep the water clean
Steam boilers need skimming after repairs and occasional flushing. Oily, dirty water surges and throws water up the risers.
Fix the venting once
Proper main vents and matched radiator vents balance a steam building better than any thermostat. It is a one-time job that ends the top-floor complaints.
What to Expect When You Hire NYC Plumber Co
Fast dispatch in heat season
No-heat calls in occupied buildings move to the front. Nights and weekends included.
Findings you can hand to the board
A written summary of what failed, what we did and what is coming next. Property managers use these for reserve planning.
Licensed gas and boiler work
Burner and gas train work under a licensed master plumber, with the gas line repair pressure testing filed when required.
Straight advice on replacement
When the boiler is done we say so, size the new one from the radiation, and explain the efficiency options without pushing the most expensive one.
Cold apartment, cold building, cold radiators on one line? Call (929) 717-4784 and a boiler repair plumber from NYC Plumber Co is on the way.
Half of the steam problems in this city are piping mistakes from 1985 that everyone has been living with. Fix the piping and the boiler suddenly works.
NYC Plumber Co
Boiler Repair Across Manhattan, Brooklyn, Queens and the Bronx
Our boiler repair plumbers cover every neighborhood below. Choose yours for local building notes and response times.
Related Plumbing Services in NYC
Water Heater Repair
Tank, tankless and indirect water heater repair.
Gas Line Repair
Burner gas lines, pressure tests and Local Law 152 inspections.
Pipe Repair
Riser, return and steam main repair and replacement.
Emergency Plumbing
24/7 no-heat and no-hot-water response.