What boiler replacement costs on the North Shore.

Boiler replacement on Chicago's North Shore typically runs $7,000-$15,000 installed, above a furnace, because the work is heavier and far less of it is a straight swap. A cast-iron hot-water boiler replaced in kind sits at the low end. A high-efficiency condensing boiler with a rebuilt primary-secondary loop, new venting, a condensate neutralizer and a proper purge sits at the top. On steam systems the sizing and the piping rules are different again, and getting them wrong is the most expensive mistake in this category.

Published 2026-08-31 · Last reviewed 2026-08-31 · Typical installed project totals for the Chicago North Shore, not quotes.

Cost by home size

Square footage drives capacity and capacity drives price. These are the same size adjustments the instant estimate calculator uses, so the two never disagree.

What the range covers

What actually moves the number

Steam or hot water, which is the whole job

These are two different projects that share a word. A hot-water system circulates through radiators or baseboard on a pump. A steam system boils water and moves it on its own pressure, with main vents, a proper header and a wet return. Steam is sized by the connected radiation - the total EDR of every radiator in the house - not by square footage and not by heat loss. Undersize a steam boiler and the far radiators never heat; oversize it and it short-cycles and hammers. Getting a firm answer on which system you have, and how it was sized, is the first thing to ask any bidder.

Near-boiler piping is not optional

This is where the money goes and where cheap boiler jobs fail. The pipe immediately around the boiler is what makes it work: on a condensing hot-water boiler a primary-secondary arrangement to protect flow through the heat exchanger, on steam a header built to the manufacturer's dimensions so the steam leaves dry. Reusing the old near-boiler piping because it was already there is the single most common defect in this trade, and it produces a new boiler that wet-steams, hammers, or fails early on a warranty the manufacturer will decline.

Condensing is not always the right answer

A condensing boiler earns its efficiency by returning water cool enough to condense the flue gas. A hot-water system with generous cast-iron radiators can run low enough water temperature to do that, and it is a good candidate. A system designed around small baseboard at high temperature often cannot, and a condensing boiler installed there costs more and never reaches its rated efficiency. On a one-pipe steam system a condensing boiler is usually the wrong product outright. An honest bid will tell you which of these you have.

Pre-war conversions leave oversized mains

A great deal of North Shore housing was built to burn coal and converted to gas or oil decades ago. The distribution left behind is generous, sometimes enormous, and it holds a lot of water. That is mostly good for comfort and it matters for sizing, purging and how long the system takes to come up to temperature. It also means the volume of the system is not what a modern sizing shortcut assumes.

Venting and the abandoned chimney

A condensing boiler vents in plastic out a sidewall and comes off the chimney entirely. If the water heater was sharing that flue, it is now orphaned in an oversized chimney and needs a liner, exactly as it does on a furnace conversion. If the chimney is abandoned altogether it needs to be capped and made safe rather than simply left open.

What is wrapped around the old pipes

Pipe insulation in homes of this age is frequently asbestos-containing. It is quoted separately and handled by an abatement contractor, not by the heating installer, and no reputable bid will bury it in a line item. Expect it to be identified at the estimate rather than discovered mid-job.

When repairing the boiler you have is the better buy

Boilers reward patience more than any other equipment in the house. A well-piped cast-iron boiler can run forty years, and most of what fails on one - circulator, expansion tank, low-water cutoff, main vents, aquastat - is a modest repair on a body that is still sound. Replace when the block or the sections are leaking, when the heat exchanger is compromised, or when the burner cannot be brought to a safe combustion result. Do not replace a sound cast-iron boiler purely on an efficiency pitch, because the payback against a forty-year body is long and much of the promised gain depends on water temperatures the distribution may not be able to deliver. The strongest replacement case is a leaking block in a house that also wants zoning or indirect domestic hot water, where the new work justifies the new boiler.

Boiler installation cost, and the one case it is not a replacement

Boiler installation on the North Shore is nearly always a replacement, and the range above is the installed total for taking an old boiler out and putting a new one in on the existing distribution. That distribution is why installing a boiler into a house that has never had one is a different proposition entirely: the radiators or the in-floor loops are the expensive half of a hydronic system, and a house without them is not a boiler candidate on cost. The useful version of the installation question on an older house here is narrower - whether the near-boiler piping is being rebuilt correctly for the new unit. A modern boiler dropped onto old piping laid out for a different appliance will not perform to its rating no matter what the plate says, and that is the line item two bids on the same house most often disagree about.

Methodology

This range is the typical installed project total for boiler replacement across Chicago's North Shore - Evanston, Wilmette, Winnetka, Kenilworth, Glencoe, Highland Park, Lake Forest, Northbrook, Glenview and the surrounding communities. It reads from the same figures as the instant estimate calculator and the main cost reference, so there is one set of numbers on this site rather than three. Ranges are reviewed as equipment and utility program pricing move, and the last-reviewed date above is accurate rather than automatic.

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