Boiler Repair, Installation & Maintenance in Chicago

A good boiler repair company handles steam as readily as hot water and tests the whole loop, not just the burner. City & Suburban Heating & Cooling has been family-owned since 1952, its technicians are NATE-certified, and it repairs all makes and models. The company holds a 4.98 average across 204 Google reviews and an A+ BBB rating. Rob, the owner, is the second generation of the founding family. William G. called about a failed boiler and wrote in a Mar 2024 Google review: "I was afraid of paying a high price for service. I was incorrect."

Yes. City & Suburban answers boiler calls 24 hours a day, 7 days a week, including nights, weekends and holidays. A boiler that quits on a January night can let pipes freeze within hours, so those calls are urgent. True emergencies include no heat in freezing weather, a steady leak, a steam boiler with an empty sight glass and a relief valve that sprays. A gas smell or CO alarm comes first: leave and call 911 or Peoples Gas (in Chicago) from outside. Same-day visits for less urgent boiler repair happen when the schedule allows.

The answer depends on the system. On one-pipe steam, a radiator heats only when its air can escape, so a clogged radiator vent or failed main vent leaves it cold. On two-pipe steam, a failed steam trap is the usual cause. On hot water, trapped air, a weak circulator or a stuck zone valve stops the flow, and low pressure starves the top floor. City & Suburban checks the boiler, then follows the heat to the cold rooms. Vents, valves and pressure are tested before any part is quoted, and the price is written down for approval first.

Banging, often called water hammer, happens when steam slams into water sitting in a pipe. Common causes are sagging pipes, radiators pitched the wrong way, a boiler filled too high, pressure set too high and dirty water that surges. Most home steam systems were designed to run at very low pressure, often under 2 psi. City & Suburban checks the water line, the pressure control and the pitch of the mains, then fixes the cause instead of the noise. Re-pitching a sagging pipe and skimming a dirty boiler often quiet a system that has banged for years.

Steam and hot-water boilers read pressure differently. A home steam boiler runs at very low pressure, usually a pound or two. A hot-water boiler stays under pressure all the time. In a two-story or three-story building, 12 to 15 psi when cold is common, rising a little as it heats. A gauge near the relief valve's limit, or a valve that drips, points to a waterlogged expansion tank or a leaking fill valve. City & Suburban tests both, sets the fill pressure for the building's height and never plugs a relief valve to stop a drip.

Most leaks are worth repairing. Relief valves, fittings, valve packing, circulator flanges and radiator spuds wear out, and those fixes are routine. The leak that changes the answer is a cracked cast-iron section. It shows as water inside the jacket, under the burner or on the floor with no outside source. City & Suburban dries the area, runs the boiler and traces the water before naming a cause. When the boiler itself is cracked, the owner gets a written replacement price beside any patch option, with the trade-offs explained in plain words.

The price depends on the system and the fault, so City & Suburban does not quote boiler work by phone. A repair is priced by the failed part and the hours, from a cleaned low-water cutoff to a new gas valve. A boiler replacement is priced by the boiler's size, steam or hot water, venting changes, near-boiler piping and basement access. Either way, City & Suburban diagnoses first and puts the exact price in writing before work starts, with no hidden fees. Wells Fargo Home Projects financing is available for larger jobs, subject to credit approval.

Replacement starts to make sense when a cast-iron section cracks or parts for an old model are no longer made. Repeated repair bills on a boiler past its expected life point the same way. Age alone is not enough, because a well-kept steam boiler can run for decades. City & Suburban confirms the failure, then prices repair and replacement side by side when both are real choices. Owners thinking about forced air can ask for a furnace replacement price too. Troy T., a rental owner, wrote in a Nov 2025 Google review: "They reviewed my options and helped me make the decision between repair and replace."

The piping decides most of it. A building piped for steam usually stays steam, because converting means new pipe and often new radiators. A hot-water building can take a modulating condensing boiler, which saves fuel when its vent and condensate drain are planned well. A combi boiler suits smaller homes and condos, where one wall-hung unit can also supply domestic hot water. A sound recommendation looks at the radiators, the piping and the chimney before naming a boiler type. City & Suburban puts the price of the chosen option in writing before work starts. Hot water or steam heats 98,849 Chicago houses and small residential buildings, by the Cook County Assessor's count.

A sound boiler installation quote sizes the new boiler to the radiators, not to the old boiler's label. For steam, that means measuring the connected radiation. For hot water, it means estimating the heat loss of the rooms. The quote should also name the venting plan, any chimney liner, the near-boiler piping and the controls. It should state who pulls the City permit and who removes the old boiler. City & Suburban puts the full price in writing before work starts. Owners comparing bids can ask each contractor how the size was chosen, which quickly separates measured quotes from guesses.

An annual boiler service differs for steam and hot water. A sound steam visit flushes and tests the low-water cutoff and checks the sight glass and pressure control. A hot-water visit checks pressure, the expansion tank, the relief valve and the circulator. Both should end with a combustion and carbon monoxide test. City & Suburban maintenance plans add seasonal check-ups, priority dispatch and member discounts. Marianne Y. wrote in a Sep 2025 Google review: "Rob has been servicing my boiler for several years."

Only hot-water radiators are bled. Each has a small bleed screw near the top, and opening it with a radiator key lets trapped air out until water appears. Once a season is typical, and more often after the system is drained or refilled. Steam radiators are never bled. On one-pipe steam, each relies on an air vent that should hiss and then close; two-pipe steam radiators use a steam trap instead. City & Suburban checks radiators during boiler service, and a system that needs bleeding every week is tested for the leak behind it.

The Chicago Heat Ordinance, Municipal Code 13-196-410, covers heat that a landlord supplies. From September 15 to June 1, units must reach 68°F from 8:30 a.m. to 10:30 p.m., and 66°F overnight. The code lists exceptions, but a dead boiler in a two-flat or courtyard building puts the owner on a clock. City & Suburban takes emergency boiler repair calls 24/7 and puts the repair price in writing before work starts. Owners can lower the odds of that call by booking boiler service before September 15, when schedules and parts are easier.

Yes. City & Suburban repairs all makes and models, including old cast-iron boilers still heating Chicago greystones and two-flats. Many of those boilers outlast the companies that built them, so controls, valves and ignition parts often come from universal replacements that fit the original. When a part truly cannot be found, the technician says so and prices the options in writing. Gas boilers are the most common, and oil boilers add a burner, nozzle and fuel filter to the checklist. A furnace elsewhere in the building is covered by furnace repair.

In the City of Chicago, replacing a boiler generally needs a building permit, while routine repair and annual boiler service do not. City permit data shows 108 boiler permits in the 24 months to August 2026. A permitted job is inspected and leaves a record that helps at a sale or refinance. Owners comparing bids should ask each contractor who pulls the permit. City & Suburban puts the replacement price in writing before work starts. A building with a furnace can add a furnace tune-up, and the full list of heating services covers the rest.