Bushwick’s boiler flues fail in more ways than most neighborhoods’ — and the fix is usually the same: a stainless-steel liner sized to the boiler. Wood-frame houses with weather-beaten freestanding stacks, brick tenements and walk-ups converted from oil to gas, converted industrial lofts with heating plants venting through coal-era stacks — the building types differ, but the liner story repeats. Clay tiles crack from freeze-thaw and from the acidic condensate that gas exhaust leaves in an oversized flue; mortar dissolves; draft weakens; and eventually the camera shows a flue that can no longer be trusted to carry exhaust safely. Sweeps Chimney Services installs stainless-steel chimney liners across Bushwick with 25 years of experience, matched to the connected boiler and to the building’s actual venting layout. Call (347) 297-9646 or message us on WhatsApp — we answer 24/7, calmly and without pressure.
Start with what a liner does for a boiler flue. It creates a smooth, correctly sized, sealed passage from the boiler to the roof. Correct sizing restores draft — exhaust moves at the right velocity instead of cooling and condensing inside an oversized clay flue. The seal matters for safety: cracked clay tiles let combustion gases, including carbon monoxide, seep sideways into masonry and into the building; a continuous stainless run keeps exhaust in the flue until it exits above the roof. And the material matters for longevity: stainless steel resists the acidic condensate that eats clay and mortar, which is why it is the standard for gas-converted flues.
Bushwick’s mixed stock makes the sizing and routing work interesting. In wood-frame houses, the flue is often a narrow freestanding stack where a flexible liner navigates slight offsets between the boiler connector and the roof termination. In brick tenements, party-wall flues may carry the residue of the oil years — heavy soot that must be cleaned before the liner goes in, so the new liner is not sitting in a corrosive bed. In converted lofts, the heating plant is larger and the stack is taller, and the liner must be sized to the plant’s actual output, not to the coal-era dimensions of the stack. One constant: we camera-measure every flue before sizing, because a liner matched to a guess is a liner that fails early.
The installation itself is top-down and minimally invasive. The liner drops from the roof through the existing flue — old clay tiles stay in place around it unless the camera showed they block the passage — then it is connected to the boiler below and finished with a proper cap above. No walls opened, no masonry demolition. Most residential jobs finish in a day; loft and commercial stacks are scheduled with building management around the heating plant’s downtime, and every install ends with the boiler restarted and draft verified.
For Bushwick owners planning a boiler replacement, the sequencing matters: camera-inspect the chimney first, and if the liner is compromised, install the stainless liner as part of the boiler project. A new boiler on a failing clay flue inherits weak draft, condensation, and spillage risk from day one — and a venting defect that predated the installation can void the equipment warranty. Lining first is how the new boiler gets the venting it was designed for.
Carbon monoxide safety: A damaged liner lets exhaust escape the flue inside the building. 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 go back inside until emergency responders clear the building.
Before installing a new boiler in Bushwick
Inspect the chimney with a camera before the new boiler is ordered. The inspection shows the true flue size and the real liner condition, so the installer sizes the venting to the boiler — and if relining is needed, it happens with the replacement, not as an emergency repair the following winter.
Pricing
Stainless-steel chimney liner installation starts at $3,000 in Brooklyn, including labor and materials. The camera inspection that determines whether you need one follows Level 2 pricing: starts at $199.
Frequently Asked Questions
Can one liner serve both my boiler and my water heater?
Often yes — boiler and water heater commonly vent into the same flue. The liner must be sized for the combined exhaust load of everything connected, not just the boiler. During the inspection we document every appliance on the flue and size the liner to the total.
My flue has a bend in it — can it still be lined?
Yes. That is exactly what flexible stainless liners are for: they navigate offsets and slight bends to form one continuous sealed run. The camera inspection maps the flue’s path first, so we know the liner will pass before the job is quoted.
Does a new liner help with carbon monoxide safety?
Directly. A cracked or missing clay liner lets exhaust — including CO — seep out of the flue into the building’s masonry and living spaces. A continuous stainless liner seals that pathway, so exhaust stays in the flue until it exits above the roof. It is one of the main safety reasons to reline a damaged flue.
How do I know the liner is the problem and not the chimney structure?
The camera. A liner problem shows as cracked, missing, or displaced tiles with the brickwork behind them still sound; a structural problem shows as failing masonry — spalled brick, open joints, leaning stack. Many flues have a bit of both, and the inspection report separates what the liner fixes from what masonry repair must address.
Can a liner be installed in winter while the boiler is in use?
Yes, with planning. The boiler is down during the install itself — typically a day for a residential flue — so we schedule on a milder stretch and coordinate with the household or building management. Emergency winter installs happen; planned pre-season installs are calmer for everyone.
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.
Related: Bushwick chimney services | Boiler Chimney Inspection Bushwick | Chimney Repair Bushwick | Chimney Liner Installation Crown Heights