Boiler won't fire, pressure gauge at zero, radiators cold on the second floor, in-floor heat lukewarm, error code on the display? HVAC Services Ottawa provides boiler repair, installation and maintenance across Ottawa — gas, propane and combi boilers from Viessmann, Navien, NTI, Weil-McLain, Lochinvar, IBC and Bosch — in the Glebe, Westboro, Old Ottawa South, Sandy Hill, New Edinburgh, Centretown and Orléans. Licensed boiler technicians, on-site diagnosis, flat-rate price in writing, most repairs done the same visit.
Boiler specialists
Cast-iron radiators in the Glebe and Westboro, in-floor heat in new builds, combi boilers in renovated semis. Most HVAC companies send a furnace tech; we send boiler technicians who work on hydronic systems every week.
Gas and propane boilers, every brand. Igniters, sensors, circulators and relief valves on the truck. On-site diagnosis, flat-rate price in writing before any boiler repair starts.
When to call
What you see at home and what it usually means. If you smell gas, leave the house and call Enbridge's emergency line before you call us.
Nothing fires, radiators stone cold. Usually a lockout from low pressure, a failed igniter, a tripped high-limit or a dead circulator. The most common call we get between December and March.
Older boilers: pilot won't stay lit, thermocouple or gas valve. Modern condensing units: a code on the display, usually flame sensor, ignition, pressure switch or fan. Note the code before you reset.
Water under the boiler that isn't from a fitting, pressure that drops no matter how often you top up, rust streaks on the jacket. A cracked cast-iron section or leaking exchanger usually means replacement, and we tell you honestly.
Too low: a leak, a failed auto-fill or air in the system. Too high: a waterlogged expansion tank or a relief valve that's dumping. Both lock the boiler out and both are an afternoon's repair.
Second floor freezing, basement cooking. Air in the loop, a stuck zone valve, a failed zone circulator or sludge in the lowest rads. Balanced and bled on the first visit.
A kettle-like rumble means scale on the exchanger; banging pipes mean air or a pump problem. Ignored, kettling cracks the exchanger. Flushed and fixed before it gets there.
A boiler that locks out at −28 means a century home dropping a degree an hour and cast-iron radiators that can crack if the water in them freezes. We don't offer you a slot next Tuesday: the nearest boiler technician is dispatched now, in the Glebe, Westboro, Sandy Hill, Centretown, New Edinburgh or Orléans.
Which one do you have?
All three heat water for your radiators or floor. They fail in different ways and need different parts. A look at the unit tells you which one you've got.
Floor-standing · cast iron
The big green or grey box in Glebe and Sandy Hill basements, often 20–30 years old, chimney-vented, feeding cast-iron rads. Simple, heavy, repairable for a long time. Typical faults: pilot, thermocouple, circulator, relief valve, cracked section at the end.
Wall-hung · condensing
A white cabinet on the wall, PVC vent out the side, 90–95% efficient. Heats on demand, no storage. Common in renovated homes in Westboro and new builds in Riverside South. Typical faults: flame sensor, fan, condensate trap, scale on the exchanger from Ottawa's hard water.
Heat + hot water
One wall unit that heats the house and makes your domestic hot water, no separate tank. When it fails, you lose both at once. Typical faults: plate exchanger scaled up, diverter valve stuck, flow sensor. Navien, Viessmann, NTI and IBC combis are what we see most.
New and replacement
Sized to your radiators and heat loss, not to the biggest unit in stock. Old boiler drained and removed, new unit hung or set, venting, gas, pumps and controls connected, system filled, purged and balanced zone by zone.
In-floor heat in a new build or addition, radiators in a renovation, a combi to free up the space a tank used.
Cracked section, leaking exchanger, parts no longer made, or a 25-year-old unit at 65% efficiency. Usually done in one day.
Same radiators, a wall-hung condensing unit, PVC vent instead of the chimney, a noticeably smaller Enbridge bill.
Combustion test, pressure test, zone balancing, and the manufacturer warranty registered in your name.
Once a year, before the cold
Most January boiler emergencies were visible in October. One visit a year keeps the efficiency, keeps the manufacturer warranty valid (most require documented annual service), and catches the cracked section before it floods the basement.
01
Burner cleaned, combustion analyzed, CO tested at the vent and in the room, gas pressure checked, venting inspected.
02
System pressure set, expansion tank charged, relief valve tested, auto-fill checked, leaks hunted at every fitting.
03
Circulators and zone valves tested, radiators bled, floor loops purged, thermostats and controls verified.
04
Condensate trap cleaned, exchanger descaled on tankless and combi units, then a written report with readings for your file.
Honest call
Condensing and combi boilers run 10 to 15 years with annual service; old cast-iron units sometimes go 25, but at a fraction of the efficiency. The technician tells you where yours sits and what the repair is worth against a new one.
Every part and every new boiler is covered by the manufacturer warranty; we hand you the paperwork and register it.
Commercial
Apartment buildings in Centretown and Vanier on one central boiler, offices on Bank Street with hydronic baseboards, retail in Westboro, churches and schools with cast-iron plants from the 1980s: when the boiler goes down, every tenant and every employee feels it within hours. We repair, maintain and replace commercial boilers and boiler plants, with annual maintenance contracts and priority dispatch for buildings.
Every brand sold in Ontario, OEM parts whenever the manufacturer warranty requires them.
FAQ
An igniter, flame sensor or relief valve is the low end; a circulator, gas valve or control board the middle; a heat exchanger or cracked section the top, where we compare against a new boiler. We don't guess over the phone: the technician diagnoses on site and gives you a flat-rate price in writing before starting.
The power switch beside the boiler, the breaker, the thermostat calling for heat, and the pressure gauge (it should sit around 1–1.5 bar cold). If pressure is at zero or there's an error light, don't keep resetting it; call for boiler repair. If you smell gas, leave and call Enbridge first.
Yes. Nights, weekends and holidays, across Ottawa: the Glebe, Westboro, Sandy Hill, Centretown, New Edinburgh, Old Ottawa South, Orléans, Kanata. Call (613) 701-6014 and the boiler technician nearest to you is dispatched; most repairs are done the same visit.
Rarely in a way that's worth it. A single section on an old cast-iron boiler can sometimes be swapped, but on most units a cracked section or leaking exchanger means replacement: the part is often half the price of a new boiler and the rest of the unit is the same age. We show you the crack and the numbers and let you decide.
Yes: new installs, replacements and conventional-to-condensing conversions. We install and service Navien, Viessmann, Rinnai, NTI, IBC, Weil-McLain, Lochinvar and Bosch, tankless and combi. The new unit is sized to your radiators and heat loss, and the manufacturer warranty is registered in your name.
Once a year, in September or October before the first cold snap. Combustion check, pressure and expansion tank, pumps and zones, radiators bled, exchanger descaled on tankless and combi units. About an hour, and most manufacturer warranties require it.
Same-day boiler repair, all brands, flat-rate price in writing. 24/7.
Book a service
Furnace, heat pump, boiler or water heater: leave your details and we'll call back to set a time and give you a flat-rate price.
No heat, no hot water, AC down: our emergency line answers 24/7, anywhere in Ottawa.
(613) 701-6014We call back within the hour. For emergencies call (613) 701-6014.
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Reviews
Cast-iron radiators, in-floor heat and combi boilers in the Glebe, Westboro, Sandy Hill, New Edinburgh and Centretown.
Boiler locked out at 11 p.m. on a −27 night, radiators going cold in our 1912 house. I searched "boiler repair near me" and HVAC Services Ottawa was the only one who actually answered. Tech was in the Glebe by midnight: pressure at zero, failed auto-fill. Refilled, bled, replaced the valve. Heat back before 1 a.m.
Eleanor M.
The Glebe
Jan 14, 2026
Ottawa boiler maintenance done every October since we bought in Westboro. Burner cleaned, combustion tested, expansion tank charged, every rad bled, written report with the numbers. This year they caught a weeping relief valve before it became a basement puddle. One hour, flat rate, same tech each time.
Patrick O.
Westboro
Oct 9, 2026
Our 28-year-old cast-iron boiler in Sandy Hill had a cracked section, water on the floor every morning. They showed me the crack with a flashlight and said straight that a repair wasn't worth it. Boiler installation in Ottawa done in one day: a Viessmann condensing unit, PVC vent out the wall, same old radiators. Gas bill down a third.
Raj V.
Sandy Hill
Mar 19, 2026
Navien combi throwing an error light, so no heat and no hot water at the same time, with a newborn in the house. Typed "boiler technicians near me", called three, these were the only ones who knew combis. Scaled plate exchanger, descaled and flow sensor replaced the same afternoon. Showed me the code chart and what to watch for.
Camille B.
New Edinburgh
Feb 11, 2026
Second-floor radiators ice cold, boiler banging like a kettle. Two heating companies quoted a full replacement without touching it. HVAC Services Ottawa sent a real boiler tech: stuck zone valve, air in the loop, scale in the exchanger. Flushed, bled, valve swapped. Honest Ottawa boiler repair, a fraction of what the others wanted.
Douglas H.
Old Ottawa South
Nov 22, 2026
I manage a 24-unit building in Centretown on one central boiler. It went down on a Saturday in January, tenants calling nonstop. They had a tech on site within two hours: failed circulator and a bad pressure switch, both on the truck. Now on an annual boiler services contract with priority dispatch. Haven't had a cold call since.
Linda S.
Centretown · property manager
Jan 31, 2026
Service area
Orléans to Kanata, Barrhaven to Rockland, 24/7. We dispatch the technician closest to your address, not whoever is free first.
Don't see your area? (613) 701-6014, we likely cover it.
East
Orléans, Cumberland, Rockland
West
Kanata, Stittsville, Carp
South
Barrhaven, Riverside South, Manotick
Central
Glebe, Westboro, Centretown, Old Ottawa South
Nepean & Gloucester
Nepean, Gloucester, Vanier, Sandy Hill
Rural
Greely, Richmond, Embrun, Russell, Kemptville
