Toronto Commercial HVAC repairs commercial boilers for office buildings, schools, healthcare, retail and multi-tenant properties across Toronto and the GTA. We service hydronic, steam, condensing and firetube boilers from 500 to 6,000 MBH, including Lochinvar Crest, IBC, Weil-McLain, Burnham and Viessmann Vitocrossal. Our gas technicians hold TSSA G1 tickets, and we are Enbridge Red Tag authorized.
Boiler failures come in a few common forms. Ignition lockouts from failed flame safeguards and weak flame signals. Short cycling from oversized boilers, bad sensors or control settings. Low-water cutoff trips from leaks, failed feeders or low flow. Circulator pump failures that leave half the building cold. On older equipment, cracked sections and failing refractory. Condensing boilers add frozen or plugged condensate lines and dirty heat exchangers.
Boiler repairs typically cost $650 to $8,500, plus a $185 diagnostic waived on repairs over $750. Every repair ends with combustion tuning and a printed combustion report.
What Does Commercial Boiler Repair Cover?
Hydronic boilers
Ignition, flame safeguard, sensors, circulator pumps, expansion tanks, air separators and primary-secondary loop issues.
Condensing boilers
Heat exchanger cleaning, condensate traps and neutralizers, venting, modulation and outdoor reset control.
Steam boilers
Pressure controls, gauge glasses, low-water cutoffs, feed systems, traps and burners in older commercial buildings.
Firetube boilers
Burners, gas trains, refractory, tube inspection and safety controls on larger plants.
Boiler Problems and Typical Repairs
| Problem | Likely cause | Typical range |
|---|---|---|
| Ignition lockout | Flame safeguard, igniter, flame rod | $650-$1,800 |
| Short cycling | Sensor, settings, oversizing, low flow | $650-$2,500 |
| Low-water trips | Leak, feeder, cutoff failure | $650-$2,200 |
| Cold zones | Circulator, valves, air in system | $900-$3,500 |
| High gas use, soot | Poor combustion | Tuning from $650 |
| Cracked section or heat exchanger | Age, thermal shock | $2,500-$8,500 or replacement |
When Do You Need Boiler Repair?
- The boiler locks out or will not light.
- Spaces are cold while the boiler room is hot.
- Banging, kettling or whistling noises.
- Water on the floor around the boiler or relief valve.
- Rising gas bills or soot around the burner.
- A Red Tag from the utility or inspector.
Boiler Safety and Compliance
Gas work follows CSA B149.1. Some boilers and pressure vessels fall under TSSA boiler and pressure vessel rules, and we coordinate inspections where required. Low-water cutoffs, pressure relief valves and flame safeguards are tested on every visit, because they are the controls that keep a boiler from damaging itself or the building.
Repair or Replace Your Boiler?
Controls, ignition and pump repairs are almost always worth doing. When a boiler is past 25-30 years, has cracked sections, or needs a repair near half the cost of a new condensing boiler, we quote both. High-efficiency condensing replacements often qualify for Enbridge incentives. Replacement work runs through our commercial HVAC replacement team, and routine boiler care fits into commercial HVAC maintenance programs.
Boiler Repair Across Toronto and the GTA
We repair boilers in downtown and North York office towers, Etobicoke and Scarborough schools and institutions, Dixon-Rexdale and Scarborough Junction industrial buildings and mixed-use properties across Vaughan, Brampton and Markham. For general heating faults, see commercial heating repair.
