Boiler Replacement in Buffalo, NY

Replace a boiler when the repair is likely to cost more than it is worth, or when the boiler can no longer be made safe. The signs include a cracked or leaking section, repeated lockouts, rusted-through controls, constant water makeup on a hot water system, and a flue that no longer vents properly.

Age alone does not settle it. Many old boilers are durable, and a worn part is often cheaper to fix than the whole unit. We give you the repair figure and the replacement figure side by side so you can see the difference. If you are not there yet, our boiler repair page explains how we diagnose first.

Converting from steam to hot water is not a simple swap. One-pipe steam radiators and their piping were laid out for steam, and the conversion can mean new radiator valves, new connections and pipe work. We walk the house and tell you whether it is sensible for your radiators. Some homes are better served by a new steam boiler.

Size from the house and the radiators you actually have, not from the nameplate on the old boiler. The old unit may have been oversized when it was installed or after later insulation work. The NYS energy code calls for equipment selected under ACCA Manual S, based on loads from ACCA Manual J or another approved method.

On a steam system, the connected radiation sets the boiler output, since the boiler has to fill the radiators with steam. On hot water, the room heat loss and the temperature of the water the radiators need set the size. A boiler that is too large cycles often, wastes fuel and wears out sooner.

High-efficiency boilers add a wrinkle. To condense and reach their rating, they need cooler return water, which old cast-iron radiators do not always give without an outdoor reset control. Venting also changes, since a new sealed unit often vents through a wall, and the old chimney may need attention for any remaining appliance such as a water heater.

The U.S. Department of Energy’s Federal Energy Management Program describes AFUE as annual heat output compared with the fuel consumed, and notes that it leaves out heat lost in the piping. An Efficiency Vermont presentation puts the return water temperature needed to condense at below about 130°F, though the exact figure varies by boiler. The rating on the box is a ceiling, and your radiators decide how close you get.

1. 1Walk-through and options. We look at the boiler, piping, radiators and chimney, and explain the choices before you commit.
2. 2Quote and schedule. You get the quote before any work and a date that fits your calendar.
3. 3Permit. We confirm what the city or town requires. In Buffalo, heating work goes through Permit & Inspection Services.
4. 4Remove and set. The old boiler comes out and the new one goes in, with new gauges, safeties and controls.
5. 5Pipe, vent and fill. Piping is reconnected, the vent is installed, and the system is filled and purged of air.
6. 6Fire, test and teach. We check the burner, controls and every radiator, and show you what normal looks like.

HomeAdvisor, which is part of Angi, lists boiler installation or replacement at an average of $5,917, with a range of $3,611 to $8,447, on a 2025 cost page. That is a national figure, not our quote. Local prices move with boiler type, the condition of the piping, venting, and any conversion or control upgrades.

We do not publish a price list, because the house decides the answer. You get the number before work starts. For a wider picture of what drives replacement pricing, see our furnace replacement cost guide, since many of the factors match.

• National Fuel: its Fall 2025 newsletter says direct incentives for gas-fired appliances ended January 1, 2026. It still runs weatherization and thermostat incentives.
• NYS Clean Heat and HEAR: these apply to heat pumps, not gas boilers. If you are weighing a switch, read our heat pump installation page.
• Federal Section 25C: it expired December 31, 2025 under P.L. 119-21.

Check each current program page before buying, since terms change.

The radiators and pipes usually stay. We check them for leaks, stuck valves and pitch while the boiler is out, and we can flush the system to remove sludge. In a double, the upper and lower units often have separate boilers, so each gets its own assessment and its own line on the quote.

In the City of Buffalo, a Heating Contractor license is required for heating work, and work started before a permit is issued can be charged double fees under Buffalo Code Chapter 175, according to eCode360. Outside the city, your town sets its own rules, so confirm with the municipality. Ask the installer which rules apply at your address, who is named on the permit, and when the final inspection happens. Erie County Consumer Protection lists the licensing rules by town. Once the boiler is in, book yearly service to protect it.