Home / Service areas /Oakville / Boiler Repair & Installation
Boiler Repair & Installation · Oakville, OntarioBoiler Repair & Installation in Oakville
Boiler repair and installation in Oakville is mostly repair: a circulator pump, a zone valve, an expansion tank or a relief valve, at $150–$800 after a $90–$150 diagnostic. Replacement is the right call only when the heat exchanger itself is leaking or parts can no longer be had. If the boiler has stopped in freezing weather, call the same day, because a hot-water system left cold can freeze and split a radiator or a pipe in an outside wall.
Radiators, in-floor loops and the boilers behind them in Oakville
Oakville has two kinds of boiler house. The first is the older lakefront stock in Old Oakville and Bronte, where cast-iron radiators have been heated by a floor-standing gas boiler for decades and the piping is wide enough to have started life as a gravity system. The second is newer: custom homes built with in-floor radiant loops and a wall-hung condensing boiler, with manifolds, mixing valves and several pumps in the mechanical room. The faults are different in each, and so are the parts we carry to them.
In the older houses the usual culprit is the expansion tank. When its bladder fails, or an old steel tank fills with water, pressure climbs as the boiler heats until the relief valve opens at 30 psi and leaves a puddle on the floor; the system then refills, and the cycle repeats. A healthy system sits at roughly 12–15 psi cold. Seized circulators, zone valves that no longer open and thermocouples on standing-pilot boilers make up most of the rest, and all of them are repairs.
Replacing a cast-iron boiler in one of these houses takes more thought than swapping a furnace. A condensing boiler vents through plastic pipe out a wall and stops using the masonry chimney, and in Old Oakville's heritage conservation district the Town may want a say in where a vent leaves a street-facing wall, so we plan a side or rear route. Decades of rust sludge in wide old piping will clog a modern heat exchanger's narrow passages, so the system is flushed and a dirt separator fitted before the new boiler fires. Because old radiators were sized generously, they often heat the house on cooler water, which is what lets a condensing boiler reach its rated efficiency.
The gas work is done by a TSSA-licensed technician on your Enbridge Gas supply, and we confirm with Town of Oakville Building Services whether a replacement needs a permit before the job is booked. Boiler replacement is quoted after a site visit, since radiator count, vent route and whether you want a combi unit that also makes domestic hot water all move the price; what a new boiler costs in Ontario gives the ranges. The boiler repair service page describes the diagnostic, and you can book a visit when you are ready.
Why ZK Mechanical for boiler repair & installation in Oakville
- Cast-iron boilers in Old Oakville and Bronte repaired, not condemned: pumps, zone valves, expansion tanks and relief valves travel on the van
- Pressure diagnosed properly, from the 12–15 psi cold fill to the 30 psi relief point, so a dripping valve is traced to its cause
- In-floor radiant systems serviced: manifolds, mixing valves, circulators and the condensing boiler feeding them
- System flush and dirt separator written into replacement quotes for old wide-bore radiator piping
- Vent routes planned around heritage-district streetscapes and the gas code's clearances
- TSSA-licensed gas technicians, and a no-heat boiler call taken on the 24/7 line at the daytime rate
- Written price before work, with the $90–$150 diagnostic credited once you approve the repair
Licensed technicians, Oakville dispatch, no overtime charges.
Boiler Repair & Installation in Oakville — FAQs
How much does boiler repair cost in Oakville?
Expect these bands. Diagnostic visit: $90–$150, credited toward the work. Small hydronic parts such as an air vent, auto-fill valve, relief valve or thermocouple: $150–$450. Circulator pump, zone valve or expansion tank: inside the $150–$800 range that most boiler repairs fall into. Heat exchanger failures and full replacements are priced after a site visit, in writing. How much boiler repair costs breaks the list down further.
My boiler's relief valve is dripping. Can it wait?
A slow drip can wait a day or two, but not a season, and the valve should never be capped or plugged. Watch the gauge: if it climbs toward 30 psi as the boiler heats, the expansion tank has failed and the valve is doing its job. If the gauge stays low and it still drips, the valve seat is worn. Put a bucket under the discharge pipe and note the cold and hot pressures for us.
Should I replace my old cast-iron boiler or keep repairing it?
Keep repairing while the faults are external parts: pumps, valves, tanks, controls. A cast-iron boiler can run 30 years or more, and those parts are generic. Replace when water is weeping between the cast-iron sections, when the burner or controls are obsolete, or when you are renovating and want the floor space back. Should I repair or replace my boiler sets out the decision in more detail.
Can I add air conditioning to a radiator-heated Oakville house?
Yes, without touching the radiators. Houses with hot-water heat have no ductwork, so cooling is normally done with ductless heads: one in the main living area and one in the primary bedroom suits most households. The boiler keeps doing the heating, and cold-climate heads can share the load in spring and fall. Our page on ductless mini-split installation in Oakville covers placement and cost.
Do you service combi boilers and in-floor heating?
Yes. A combi boiler heats the house and makes domestic hot water from one wall-hung unit, so a fault can show up as hot taps but cold floors, or the reverse; the usual suspects are the diverter valve, a flow sensor or a scaled plate heat exchanger. In-floor systems add mixing valves and loop actuators at the manifold. We test each in turn instead of guessing, and quote the fix before starting.
Other HVAC services in Oakville
Boiler Repair & Installation in Oakville — fast.
Emergency repair or planned upgrade, quoted in writing before any work starts.