# Commercial Boiler Repair Toronto | Toronto Commercial HVAC > Commercial boiler repair in Toronto for hydronic, steam, condensing and firetube boilers, 500 to 6,000 MBH. $650-$8,500. Enbridge Red Tag authorized. URL: https://torontocommercialhvac.ca/commercial-boiler-repair/ Repair $185+ diag # Commercial Boiler Repair in Toronto, ON | Hydronic, Steam, Condensing & Firetube Boiler Service | TSSA G1 Last updated: October 10, 2026 Commercial boiler repair for hydronic, steam, condensing and firetube boilers from 500 to 6,000 MBH. We work on Lochinvar, IBC, Weil-McLain, Burnham and Viessmann, are Enbridge Red Tag authorized, and handle short-cycling and low-water cutoff faults on the first visit. Hydronic, steam, condensing and firetube boiler repair, 500-6,000 MBH. $650-$8,500. - 500-6,000 MBH boilers - Red Tag clearance and re-inspection - Combustion tuning - 90-day labour warranty Call (437) 524-2997 [tel:+14375242997 →](tel:+14375242997) Request Service [/contact/ →](/contact/) View pricing [#pricing →](#pricing) ![Gas technicians repairing a condensing boiler in a Toronto commercial boiler room](/images/misc/two-tssa-gas-technicians-repairing-a-lochinvar-cre.webp) Quick Facts Pricing $185+ diag Emergency response 2-4 hours, 24/7 Labour warranty 90 days Program lead Daniel Okonkwo, Operations Lead Commercial Credentials & Verification TSSA G1 + G2 Licensed Gas Technicians ESA Electrical Safety Authority 313A Refrigeration Licensed Refrigeration Mechanics $5M CGL + WSIB Enbridge-Authorized Since 2006 2-4 Hour Emergency Response 90-Day Labour Warranty on Repairs / 2-Year on Installs 5-Star Commercial Satisfaction 20+ Years Commercial-Only 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 [/commercial-hvac-replacement/ →](/commercial-hvac-replacement/) team, and routine boiler care fits into commercial HVAC maintenance [/commercial-hvac-maintenance/ →](/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 [/commercial-heating-repair/ →](/commercial-heating-repair/) . Transparent Pricing ## How Much Does Commercial Boiler Repair Cost in Toronto? Diagnostic $185 Ignition, controls, safety, combustion and hydronic diagnosis. - Combustion and CO test - Safety controls tested - Written findings Book This [tel:+14375242997 →](tel:+14375242997) Most Requested Controls and Ignition $650-$2,500 Ignition modules, flame safeguards, low-water cutoffs, sensors, pumps. - Usually same visit - Combustion tuning - 90-day labour warranty Book This [tel:+14375242997 →](tel:+14375242997) Major Boiler Repair $2,500-$8,500 Burners, heat exchanger sections, refractory, gas trains, large pumps. - Red Tag clearance support - TSSA coordination - Repair vs replace comparison Book This [tel:+14375242997 →](tel:+14375242997) The $185 diagnostic is waived on repairs over $750. Larger firetube and steam boiler repairs, tube work and refractory are quoted after inspection. Temporary heat is available for extended repairs. Why Us ## Why Choose Toronto Commercial HVAC for Boiler Repair? ### TSSA G1 Gas Technicians Licensed for commercial boilers up to 6,000 MBH and beyond residential limits. ### Enbridge Red Tag Authorized We repair red-tagged boilers and coordinate clearance so buildings get heat back fast. ### Every Boiler Type Hydronic, steam, condensing and firetube, from Lochinvar Crest to Viessmann Vitocrossal and older cast iron. ### Fix Short Cycling Short cycling wears boilers out fast. We look at controls, sizing and loop design, not just the burner. ### Combustion Tuned Every repair ends with combustion analysis and tuning, which often cuts gas use. ### 90-Day Labour Warranty Boiler repairs carry a 90-day labour warranty, with manufacturer parts warranties passed through. ## Repair or replace? Get the numbers first. A $185 diagnostic gives you written findings per unit, waived when the approved repair is over $750. (437) 524-2997 [tel:+14375242997 →](tel:+14375242997) Request Service [/contact/ →](/contact/) Process ## How Does Our Boiler Repair Process Work? 1. 01 ### Call Dispatch No-heat boiler calls get a 2-4 hour emergency response, 24 hours a day, with priority in cold snaps. 2. 02 ### Inspect and Test Ignition, flame signal, safeties, low-water cutoff, pressure, combustion and loop flow checked. 3. 03 ### Make Safe and Quote Unsafe conditions are shut down and tagged. Written findings and a fixed repair price before work. 4. 04 ### Repair Controls and ignition repairs usually close on the first visit. Daniel Okonkwo, Operations Lead, signs off every boiler report. 5. 05 ### Tune and Document Combustion tuning, safety test and a printed combustion report for your building file. Field Photos ## Boiler Repair Work on Toronto Commercial Sites Client Feedback ## What Clients Say About Our Boiler Repair 5-Star Commercial Satisfaction > "Our two condensing boilers were cycling every few minutes. They fixed the sensor, reset the controls and our winter gas bill dropped." Frank DiMarco Property Manager, Four-storey professional office building Vaughan Condensing boiler short-cycling fix and control reprogramming$2,100 > "The boiler failed on a school day in January. They had temporary heat in the gym by noon and the burner repaired within two days." Agnes Wojcik Facilities Manager, Elementary private school Etobicoke Firetube boiler burner and gas train repair$7,900 > "Half the building was cold while the boiler room was hot. They found a failed circulator and a badly balanced loop and fixed both in one visit." Dev Malhotra Building Operator, Mixed-use retail and office building Brampton Circulator pump replacement and loop balancing$3,400 Straight Answers ## Boiler Repair FAQs ### How much does commercial boiler repair cost in Toronto? + Commercial boiler repair in Toronto typically costs $650 to $8,500, plus a $185 diagnostic that is waived on repairs over $750. Controls and ignition repairs such as ignition modules, flame safeguards, low-water cutoffs, sensors and circulator pumps usually run $650 to $2,500. Major repairs such as burner assemblies, heat exchanger sections, refractory, gas trains and large pumps run $2,500 to $8,500. Large firetube and steam boilers with tube or refractory work are quoted after inspection. Every repair includes combustion tuning, and we put a replacement option in writing when a boiler is past 25-30 years or the repair cost is high. ### Why is my commercial boiler short cycling? + Short cycling usually comes from an oversized boiler, poor control settings, a failed sensor, low system flow or a primary-secondary loop that is piped or balanced badly. It wastes gas and wears out ignition parts and heat exchangers. We check controls, flow and sizing together, then fix the cause. ### What does a low-water cutoff do? + The low-water cutoff shuts the burner off if water level or flow drops below a safe point, protecting the boiler from overheating and damage. A failed cutoff is a serious safety issue. We test it on every boiler visit. ### Do you repair steam boilers? + Yes. Steam boilers in older Toronto commercial buildings, including pressure controls, gauge glasses, low-water cutoffs, feed systems and burners. ### What sizes of boilers do you work on? + From 500 MBH up to 6,000 MBH, covering most commercial office, retail, school, healthcare and multi-tenant buildings. ### Can you clear an Enbridge Red Tag on a boiler? + Yes. We repair the deficiency, test combustion and safety controls and coordinate clearance with the utility. ### Do you need to involve TSSA for boiler repairs? + Some boilers and pressure vessels fall under TSSA boiler and pressure vessel rules for inspection and repair. We coordinate with TSSA where the work requires it. ### Can you provide temporary heat during a long repair? + Yes. For extended repairs or replacements we arrange temporary boilers or heaters to protect the building and pipes. ### When should a commercial boiler be replaced? + Usually when it is past 25-30 years, has cracked sections or a failed heat exchanger, or repair costs approach half of a new condensing boiler. We quote both options. ### Is there a warranty on boiler repairs? + Yes, a 90-day labour warranty, plus manufacturer parts warranties. Keep Exploring ## Related Services ![Gas technicians repairing a radiant tube heater inside a Toronto warehouse](/images/misc/two-gas-technicians-in-hard-hats-repairing-an-infr.webp) [/commercial-heating-repair/ →](/commercial-heating-repair/) ### Commercial Heating Repair [/commercial-heating-repair/ →](/commercial-heating-repair/) $185+ diag Heating repair for boilers, radiant heaters, RTU heat sections and MUA. $450-$4,500. 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View service [/commercial-hvac-maintenance/ →](/commercial-hvac-maintenance/) ![Emergency technicians working on a rooftop unit at night in Toronto](/images/misc/two-emergency-hvac-technicians-with-headlamps-work.webp) [/emergency-commercial-hvac-repair/ →](/emergency-commercial-hvac-repair/) ### 24-Hour Emergency Commercial HVAC Repair [/emergency-commercial-hvac-repair/ →](/emergency-commercial-hvac-repair/) $185 surcharge 24-hour emergency dispatch across Toronto and the GTA with 2-4 hour response. View service [/emergency-commercial-hvac-repair/ →](/emergency-commercial-hvac-repair/) ![Crane removing an end-of-life rooftop unit from a Toronto retail plaza](/images/misc/crane-removing-a-rusted-20-year-old-rooftop-unit-f.webp) [/commercial-hvac-replacement/ →](/commercial-hvac-replacement/) ### Commercial HVAC Replacement [/commercial-hvac-replacement/ →](/commercial-hvac-replacement/) $12K-$680K End-of-life replacement for 15+ year buildings with reserve-fund documentation per unit. View service [/commercial-hvac-replacement/ →](/commercial-hvac-replacement/) ![](/images/misc/two-commercial-hvac-technicians-in-hard-hats-walki.webp) 24-Hour Commercial Emergency Dispatch ## Ready to Book Boiler Repair? Commercial Boiler Repair across Toronto and the GTA: $185+ diag, written findings before any work, and a 2-4 hour emergency response. Call (437) 524-2997 [tel:+14375242997 →](tel:+14375242997) Request Service [/contact/ →](/contact/) - TSSA G1+G2, ESA, 313A - Written findings every visit - 90-day / 2-year labour warranty