In Ottawa, the worst time to discover a problem is the first real cold snap. Most “surprise” breakdowns aren’t random. They’re the end result of small issues that were building for months (sometimes years).

Maintenance isn’t about babying equipment. It’s about keeping the system clean, verifying it’s running correctly, and catching the common failures early - before they turn into a no-heat call when it’s brutally cold outside.

This post covers furnaces, gas fireplaces, and tankless water heaters - the most common equipment we service.

Maintenance-preventable failures we constantly see in Ottawa

High-efficiency furnaces: condensate and drainage problems are huge

On condensing furnaces, drain lines are a constant failure point. We see:

When a furnace can’t drain properly, it’s being stressed every time it runs. That can trigger nuisance lockouts (pressure switch issues), water where it shouldn’t be, and long-term reliability problems. In heavy Ottawa heating season, those small problems become big problems quickly.

We also regularly see furnaces that were never properly verified on startup. Gas pressure and combustion setup matter. If those basics aren’t confirmed, performance and reliability can suffer.

Fireplaces: it’s an open flame in a box in your house -cleaning matters

A gas fireplace isn’t just “decor.” It’s combustion equipment.

Over time, soot and combustion residue build up on burners and internal components. Even if you barely use the fireplace, the pilot still runs and slowly dirties the thermocouple and thermopile. That’s one of the most common reasons we see intermittent pilot and ignition issues.

If the unit has a blower, there’s no filter protecting it—so dust buildup can shorten blower life.

Tankless: performance drop-offs are usually gradual

Tankless water heaters depend on efficient heat transfer through the heat exchanger at high temperature. Over time:

The practical effect is the unit slowly “runs harder” to achieve the same hot water output. A proper flush and cleaning often resets the system closer to how it was meant to run.

What a proper furnace maintenance should include (and the shortcuts that don’t cut it)

Here’s the most common shortcut we see: someone shows up, vacuums the cabinet, maybe token-cleans the flame sensor, and leaves.

That’s not a thorough maintenance. A high-efficiency furnace has real failure points that aren’t visible unless you access the unit properly.

What “done right” typically includes

1) Full access and real inspection

Not just looking in the cabinet. Opening the unit enough to actually see what matters.

2) Heat exchanger inspection (primary and secondary, where applicable)

The heat exchanger is the core of the furnace. On condensing furnaces, the secondary heat exchanger is commonly ignored because it takes effort to access and inspect properly.

Anything that makes it past the filter eventually ends up somewhere inside the furnace. Over time, buildup can contribute to airflow and heat transfer issues. If access is possible, careful cleaning and inspection can help reduce long-term problems (done carefully - secondary components can be delicate).

3) Blower inspection and deep cleaning

The blower is a major driver of comfort and system health. Surface-level cleaning is not the same as actually addressing buildup that affects airflow.

4) Ventor inspection and cleaning (as appropriate)

The ventor assembly matters for reliable operation, especially on high-efficiency equipment.

5) Condensate system service (non-negotiable)

A proper maintenance includes cleaning and verifying the condensate drains and connections. If drains weren’t checked, the most common failure point wasn’t addressed.

6) Verification with measured checks

A proper service ends with verification, not “it fired up.” Meaningful checks depend on equipment type, but the principle is the same: confirm the system is operating correctly after cleaning and reassembly.

7) A report you can keep

You should be left with a clear record: what was checked, what was cleaned, and what was verified. If you get no documentation, it’s hard to know what was actually done.

Time expectation

A thorough furnace maintenance isn’t a 30-minute “in and out.” Done properly, it typically takes about 1.5 to 2 hours - because proper access, cleaning, reassembly, and post-check verification take time.

Fireplaces: what neglect actually does (without the drama)

Fireplace neglect is usually a slow, cumulative problem:

Most fireplace issues we see are nuisance failures that could have been prevented with routine cleaning and inspection.

Tankless maintenance in plain English: it’s a reset

Tankless systems don’t “use up refrigerant” or anything like that - but they do get dirty internally over time.

A proper tankless maintenance is not a quick look. It should include a flush and clean, plus inspection/cleaning of relevant internal components, followed by verification that the system is operating correctly.

Does maintenance pay off? Only if the visit is real

Maintenance ROI is tough to calculate because “maintenance” ranges from superficial to thorough.

Low-price maintenance specials often mean a quick vacuum and a box-check. That kind of visit does little for longevity and doesn’t meaningfully reduce breakdown risk.

A thorough maintenance is different. You’re paying a predictable yearly cost to:

Many homeowners also prefer maintenance plans because they bundle visits and often reduce per-visit cost, while helping companies schedule work in shoulder seasons. It’s not glamorous - just practical.

What homeowners can do between visits (and what not to touch)

Helpful homeowner habits

Leave this to professionals

Best time for maintenance in Ottawa (honest answer)

Furnace/fireplace/tankless: once per year is the main point. Fall is convenient because you’re ready before winter.

Cooling equipment: timing matters more (see Part 2) because outdoor conditions affect what you can verify.

How often should you maintain each system?

Baseline rule: yearly for most major equipment.

Manufacturers commonly include maintenance requirements in manuals and warranty terms, and in some claim situations they may request service records. Separately from warranty language, yearly maintenance is simply the most practical cadence to keep drains, coils, and combustion components in healthy shape.

Need maintenance done properly in Ottawa?

Peak Comfort HVAC serves Ottawa and surrounding areas (including Barrhaven, Riverside South, Kanata, Orléans, and more). If you book maintenance, ask one simple question: “Will I receive a written report of what was cleaned, inspected, and verified?” That tells you a lot.