132 Cartwright Ave, North York ON
Mon–Sat 8am–7pm · Sun 9am–5pm
Boiler repair & replacement
Boiler repair & replacement
across Toronto & the GTA
Boilers fail differently from furnaces. The heat usually goes room by room, and the cause is as often in the loops, pumps and valves as in the boiler itself.
TSSA-licensed gas & hydronic work
Combi, cast-iron & condensing expertise
Zone valve & circulator repairs
North York based — GTA-wide
At a glance
SystemsHot-water boilers
TypesCombi & space heating
EfficiencyCondensing options
DistributionRadiators & in-floor
CoverageFull GTA
Support7 days a week
1,000+
Clients served
TSSA
Certified team
7 days
A week support
GTA-wide
Service coverage
20+ yrs
Climate experience
Hydronic heating
Boilers that keep Toronto buildings comfortably warm
A radiator that never gets hot, a zone that works only when another is off, a system that needs topping up every few weeks — these are distribution faults, and swapping the boiler will not fix any of them. We diagnose the boiler and the loop together, because on a hydronic system they are one machine.
Toronto has a lot of older hydronic heating still running well, and it is worth keeping running. Cast-iron boilers can be serviced long past the point most companies would condemn them, and where a replacement genuinely is due, a condensing or combi unit has to be piped correctly for it to deliver what it promises.
Near-boiler piping, condensate neutralisation and correct venting are where hydronic installs go wrong quietly. They are also invisible at handover, which is exactly why we document what was done and why.
What matters most for boiler repair and replacement in the GTA
Right sizing, licensed gas/refrigeration work, and commissioning beat the cheapest sticker price. We verify airflow, safety devices, condensate paths, and controls so your system does not fail the first extreme week of the season. Ask us about dual-fuel, zoning, and rebate-eligible models during your quote.
Condensing boiler incentives
High-efficiency condensing boilers may qualify for utility or provincial incentives when correctly sized and installed. Review current details on our rebates & incentives page before you order equipment.
Boiler warning signs
- Pressure drops repeatedly after refill
- Radiators cold at the top or entire zones offline
- Gurgling, banging, or kettling noises
- Visible leaks at fittings, pump seals, or the relief valve
- Pilot or ignition faults on gas boilers
- Yellow flame, soot, or strong combustion odours
- Boiler cycling on and off every few minutes
- Expansion tank waterlogged or relief valve dripping
Practical sequence
How we approach boiler repair and replacement
A structured process so you always know the next step.
Consult
Goals & constraints
Assess
On-site measurements
Compare
Repair vs replace
Schedule
Parts & access
Execute
Licensed install
Verify
Commission & teach
Boiler capabilities
Boiler repair, replacement & hydronic support
Licensed work on residential and light commercial boilers — from emergency no-heat to full plant upgrades.
Boiler diagnostics & repair
Ignition, gas trains, heat exchangers, sensors, aquastats, and control modules repaired with documented findings.
Request a consultation →Boiler replacement
Condensing, cast-iron, and combi installations with correct near-boiler piping, primary/secondary loops, and venting.
Request a consultation →Circulators & zone valves
Pump swaps, flange gasket sets, zone valve actuators, and end-switch troubleshooting that restore even heat.
Request a consultation →Expansion & safety devices
Expansion tanks, relief valves, backflow preventers, and air separators sized and replaced to code.
Request a consultation →System flushing & water quality
Flushing, inhibitor dosing, and magnetic filtration recommendations for older Toronto hydronic loops.
See all heating services →Multi-zone balancing
Balancing valves, thermostat mapping, and outdoor reset setup for comfortable multi-storey homes.
Book a hydronic visit →
Not sure yet?
Get both numbers before you decide
We will quote the repair and the replacement, in writing, and tell you which one we would choose.
Book an assessmentWhy Toronto Air Systems
Why Toronto Air Systems for boilers
Local crews, licensed workmanship, and recommendations built around how Toronto buildings actually heat and cool — not generic scripts.
TSSA-licensed technicians
Every technician who works on your equipment holds current Ontario gas and/or refrigeration credentials — no uncertified subcontractors.
Built for Toronto winters & summers
We size and install equipment for real GTA climate extremes, not brochure averages from milder markets.
Transparent pricing
Detailed written quotes with equipment specs, labour, and warranty terms. No bait-and-switch or surprise change orders.
Multi-brand expertise
We service and install major HVAC brands, so recommendations fit your home — not a single manufacturer quota.
How it works
Our boiler service process
From first call to commissioned equipment, you always know the next step, the timeline, and what is included.
01
Consultation
Tell us about your home or building, symptoms, and goals — by phone or online form.
02
On-site assessment
A licensed technician evaluates your existing boiler, ductwork, and load requirements.
03
Written quote
You receive clear options, pricing, timelines, and rebate notes — no vague estimates.
04
Installation or repair
Our TSSA-licensed team completes the work to code with minimal disruption.
05
Follow-up support
We walk you through operation, warranty, and ongoing maintenance recommendations.
Brands we work with
Boiler brands we know well
We service and install leading hydronic brands common across Toronto housing stock.
Where we work
Boiler service throughout the GTA
From downtown walk-ups to Mississauga and Markham detached homes — same licensed standard.
Toronto
All neighbourhoods & districts
North York
Our home base
Mississauga
West GTA residential & commercial
Brampton
Full HVAC coverage
Vaughan
Including Woodbridge & Concord
Markham
East GTA homes & businesses
Richmond Hill
Residential & mixed-use
Scarborough
East Toronto
Etobicoke
West Toronto
Oakville
Halton Region
Pickering & Ajax
Durham Region
Whitby & Oshawa
East GTA
Client reviews
Boiler clients across the GTA
Our 1980s cast-iron boiler kept losing pressure. They found a micro-leak at a radiator valve and a failed expansion tank — fixed both, and the system has been stable all winter.
Toronto Annex
Replaced our atmospheric boiler with a wall-hung condensing unit. Piping looked factory-clean and they explained outdoor reset so we are not overheating the house.
Brampton
Zone valves on the third floor were dead. Same-day actuators, purged the loops, and every radiator is hot again. Highly recommend.
Richmond Hill
FAQ
Boiler FAQ for Toronto homeowners
Why does my boiler keep losing pressure?
Common causes include small system leaks, a failed auto-fill, a waterlogged expansion tank, or a weeping relief valve. We pressure-test and inspect fittings rather than endlessly topping up.
What is the difference between a combi and a regular boiler?
A combi boiler provides space heating and on-demand domestic hot water in one cabinet. A heating-only boiler needs a separate tank or indirect for hot water. We help choose based on fixture count and simultaneous demand.
How long do boilers last in the GTA?
Well-maintained cast-iron boilers can run decades; condensing heat exchangers often last 12–20 years depending on water quality and maintenance. Annual service extends life significantly.
Can you convert my house from forced air to hydronic?
Sometimes — it depends on available distribution paths, floor construction, and budget. Many clients combine a new boiler with existing radiators or add radiant zones. Start with a site assessment.
Do condensing boilers need special venting?
Yes. They typically use PVC/CPVC or polypropylene venting and require condensate drainage with neutralization when required. Improper venting voids warranties and is unsafe — we install to manufacturer and code.
My radiators are hot downstairs but cold upstairs — is that the boiler?
Often it is air, undersized piping, failed zone valves, or balancing — not the burner itself. We check the boiler first, then walk the distribution.
Are boiler upgrades eligible for rebates in Ontario?
High-efficiency condensing models sometimes qualify. See rebates & incentives and we will flag matches on your proposal.
How much does boiler repair and replacement cost in Toronto?
Cost depends on equipment capacity, brand, duct or piping complexity, electrical/gas upgrades, and whether you repair or replace. We provide written quotes after a site assessment so you can compare options fairly. Call 647 953-4252 for a visit.
Do you serve my area in the GTA?
Yes. We are based in North York at 132 Cartwright Ave and regularly serve Toronto, Mississauga, Vaughan, Markham, Scarborough, Etobicoke, Brampton, and nearby communities.
Are your technicians licensed?
Yes. Gas and refrigeration work is performed by TSSA-licensed technicians. We follow Ontario code practice for venting, refrigerant handling, electrical disconnects, and condensate management.
Need your boiler back online?
Call Toronto Air Systems for licensed hydronic repair or a replacement quote — 647 953-4252.