The brownstones of Carroll Gardens almost all heat the same way: a boiler in the basement, venting through a masonry chimney built for coal a century ago. When an old oil boiler is swapped for a modern gas unit — which has happened on nearly every block — the new boiler breathes through a flue that was sized for something else. That mismatch is the single most common cause of boiler venting problems we find in this neighborhood: poor draft, condensation eating the terra cotta liner, and exhaust spilling back into the basement instead of going up.
A boiler chimney inspection looks at exactly this. We run a camera up the flue from the boiler room to the roof and check seven things: blockage, soot buildup, cracked or missing liner tiles, masonry deterioration, backdrafting at the draft hood, whether the flue size matches the connected boiler, and carbon monoxide safety. The brownstones on President and Carroll Streets, the smaller rowhouses near the Gowanus edge, the apartment buildings on Hamilton Avenue — the building type changes, but a century-old coal chimney breathing for a modern gas boiler always deserves the same seven-point check.
You receive photos from inside the flue and a written report: what is safe, what needs monitoring, and what must be fixed before it becomes a shutdown or a CO incident.
Carbon monoxide safety: If your CO alarm sounds, or anyone feels dizzy, nauseous or headachy near the boiler — get everyone out of the building, call 911, and do not re-enter until emergency responders clear the building.
Before installing a new boiler in Carroll Gardens
Old brownstone chimneys are almost never the right size for a new boiler by accident. Inspect the flue before the installer sizes the liner: the camera shows the true interior dimensions and condition, so the new boiler gets a flue that drafts correctly from day one.
Pricing
Boiler chimney inspections follow Level 2 pricing: starts at $199 in Brooklyn. Stainless-steel liner installation, if the flue needs it, starts at $3,000 including labor and materials.
Frequently Asked Questions
My boiler was just serviced — why inspect the chimney too?
A boiler service covers the burner and controls. It does not put a camera up the flue. Blocked flues, cracked liners and sizing mismatches are chimney problems, and they are what cause the shutdowns and soot that a boiler service alone will not find.
What is backdrafting?
When the flue cannot pull exhaust upward — because of blockage, wrong sizing or a cold, oversized chimney — exhaust spills back into the boiler room. Warning signs: soot around the draft hood, a smell of exhaust, the boiler cycling off unexpectedly.
Do gas boilers damage old chimney liners?
They can. Modern gas boilers run cooler exhaust than old oil units, which means more condensation inside a masonry flue. Condensate eats mortar and terra cotta from the inside — the reason many brownstone flues need relining after an oil-to-gas conversion.
Who inspects boiler chimneys in NYC — a plumber or a chimney company?
A chimney specialist inspects the flue; your heating technician handles the boiler itself. For venting problems the two work together, and our report gives your tech exactly what they need.
Call (347) 297-9646 or message us on WhatsApp — we answer 24/7, calmly and without pressure. Heating season is here — slots fill fast, book before the rush.
Sweeps Chimney Services INC, 68 Jay Street, Brooklyn, NY 11201, (347) 297-9646.
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