Author: Melissa Macgregor

The furnace picks its moment. It’s the first properly cold morning in Courtenay, the house won’t come up to temperature, and you’re in the crawlspace with a flashlight trying to work out whether you’re looking at a small fix or a big cheque.

That question has a real answer, and you can get most of the way to it before anyone opens a toolbox. A single failed component and a furnace at the end of its working life leave different fingerprints — and knowing which one you’re looking at keeps the decision yours.

The short answer — when a repair still makes sense

Repair is usually the right call when the furnace is heating properly the rest of the time and the fault is a single component. Gas furnaces tend to fail at a component rather than all at once. Most fixes are a thermocouple, thermopile, igniter, or gas valve — parts that are replaceable, available, and don’t require touching the rest of the system.

If your furnace has been steady for years, has had no other faults, and has failed once in a way that traces back to one component, repairing it is the sensible move. There is no reason to replace a working heat exchanger because an igniter gave out.

Replacement earns its place when the failures start stacking up — when you’re calling about the same appliance more than once a season, when the fault is in the heat exchanger itself, or when the unit is old enough that parts are getting hard to source. At that point you’re not choosing between a repair and a replacement. You’re choosing between a replacement now and a replacement in January.

The signs that you’re in that second group show up long before the furnace quits.

Five signs your furnace is telling you something

None of these on their own means “replace it.” Together, they build a picture.

1. It’s running much longer to hit the same temperature. A furnace that used to cycle now runs almost continuously in shoulder season. That’s usually efficiency dropping off, and it shows up on the gas bill before it shows up as a breakdown.

2. Some rooms never get warm. Uneven heat can be a duct problem rather than a furnace problem — but if it’s new, and nothing about the house has changed, the furnace is worth looking at.

3. The noises are new. A furnace that bangs on startup or rattles at the burner is telling you something specific. When your unit won’t fire, loses pressure, bangs, or shuts down on safety, that’s a diagnostic call, not a wait-and-see.

4. You’re calling about it more than once a season. One repair is a repair. Three repairs is a payment plan on an appliance you’re going to replace anyway.

5. Parts are getting hard to find. This is the quiet one. When a gas fitter tells you a part is on backorder or has to be substituted, the appliance has aged out of easy support — and the next failure will take longer to fix.

The same question comes up with the other big gas appliance in the house — our guide to water heater maintenance and replacement works through the same call for a hot water tank.

What a furnace repair actually involves

A repair visit starts with diagnosis, not parts. The gas-side components get checked in order — burner, ignition, gas valve, venting, safety controls — and the fault gets traced before anything is swapped. A pilot and burner clean, thermocouple and igniter check, gas valve test, and venting inspection covers most of what goes wrong on a residential gas furnace.

That matters because a misdiagnosed furnace gets a new part and fails again on the same fault. Diagnosis first is slower on the day and cheaper over the winter.

What actually drives the cost of a new gas furnace

If the diagnosis points at replacement, the next question is always cost — and there’s no honest single number, because a furnace replacement isn’t one line item. Five things move the price, and they move it a lot:

Efficiency tier. A condensing furnace costs more up front and less to run. It also vents differently, which affects the install.

Sizing. This is the one homeowners skip and it’s the one that matters most — more on it below.

Venting. High-efficiency units produce condensate and vent differently from older mid-efficiency furnaces. If you’re moving from one to the other, the venting and the condensate drain both change, and that’s real work.

Gas supply. The existing gas line may or may not be sized for the new unit. Gas supply gets checked as part of any furnace installation, and if it needs upgrading, that’s part of the job.

Permit and inspection. Gas work in BC is permitted work. That’s not optional and it’s not a line item worth shopping around on.

The only way to get a real number is to have someone look at the actual appliance, the actual venting, and the actual gas supply in your actual house. That’s what a free estimate is for. You get clear pricing before the job starts — no surprises on the invoice.

What the efficiency numbers mean in a BC home

Furnace efficiency is measured as AFUE — the percentage of the fuel that ends up as heat in your house rather than out the vent.

Older power-vented furnaces sit in the 78–84 AFUE range. Condensing furnaces run 90–98 AFUE — and under Canada’s Energy Efficiency Regulations, a standard residential gas furnace manufactured on or after July 3, 2019 has to hit a minimum of 95% AFUE. So if you’re replacing a mid-efficiency unit, you are moving up a tier whether you planned to or not — and the floor is higher than a lot of the advice online still says it is.

Above that minimum, ENERGY STAR certification is the next step: an ENERGY STAR certified forced-air furnace fuelled by gas uses 6% less energy, on average, than a standard model. On the coast, where the heating season is long but rarely brutal, that difference compounds over a lot of mild months rather than a few extreme ones.

Sizing matters more than brand

Efficiency is the number on the sticker. Sizing is the number that decides whether you like living with the furnace — and it’s the one that gets rushed.

An oversized furnace short-cycles: it blasts, hits the thermostat, shuts off, and the house swings between too warm and not warm enough. That swing is the thing homeowners actually notice day to day, and it traces back to the sizing rather than to the brand on the front.

The correct method is a heat loss calculation on the actual house, done to the CSA F280 standard. Natural Resources Canada is blunt about the alternative: “A calculation based only on the floor area of the home or on replacing the furnace with one of ‘equivalent’ size is not adequate in most cases.”

In practice that means the fact your old furnace was a certain size is not, by itself, a reason for the new one to be. Houses get insulated. Windows get replaced. Additions get built. The number should be recalculated.

Who is allowed to do gas work in BC

Gas work is regulated in British Columbia, and furnace installation is gas work.

Per Technical Safety BC, gas installation permits are required for licensed contractors installing regulated gas equipment or gas systems. That means the person doing the work holds a gas licence, the job gets permitted, and the installation is done to code rather than to whatever was there before.

Siegfried Plumbing & Gas works to that standard. Red Seal certified journeyman plumber and gas fitter. Fully insured and WorkSafeBC covered. All work completed to BC Plumbing Code. Sized to your home, gas supply checked, venting installed to spec, condensate drain set, and the unit started up and calibrated — that’s what a proper installation looks like, and it’s why the permit exists.

A Comox Valley note on timing

If your furnace made it through last winter but you didn’t love how it behaved, now is the window.

Shoulder season is when this work goes smoothly: the house doesn’t need heat while the swap happens, the schedule has room, and nobody is deciding on a furnace in a cold living room in January. And if the answer turns out to be “this one’s got plenty of life left in it,” a free estimate is what it cost you to find that out.

Same-day service is available, 7 days a week, 8am to 6pm, across Courtenay, Comox, Cumberland, Royston, Union Bay, Fanny Bay, Merville, Black Creek, and Campbell River.

Don’t see your area listed above? Call and ask — chances are we’ll still cover you.

Furnace FAQ

How do I know whether to repair or replace my furnace?

If the furnace is otherwise heating well and the fault traces to one component — an igniter, a thermocouple, a gas valve — repair it. Repeat calls on the same appliance, a fault in the heat exchanger, or parts becoming hard to source usually point to replacement instead. A diagnostic visit tells you which one you’re in.

Do I need a permit to replace a gas furnace in BC?

Yes. Gas installation permits are required for licensed contractors installing regulated gas equipment or gas systems in British Columbia. The permit is pulled as part of the job.

What efficiency should I be looking at?

Canada’s Energy Efficiency Regulations set the minimum at 95% AFUE for a standard residential gas furnace manufactured on or after July 3, 2019 — so every new unit sits in the condensing range. ENERGY STAR certified models go further: a gas forced-air furnace with that certification uses 6% less energy on average than a standard model.

Can you just put in the same size furnace I had before?

That’s the shortcut, and it’s usually the wrong answer. The size should come from a heat loss calculation on your house as it is now — insulation, windows, and additions all change the number.

Do you charge for an estimate?

No. Estimates are free, and you get clear pricing before the job starts — no surprises on the invoice.

A furnace that’s acting up doesn’t have to be a crisis, and it doesn’t have to be a guess. Book a diagnostic and you’ll get a straight answer on whether you’re looking at a part or an appliance — and a free estimate either way.

Licensed, insured, and WorkSafeBC covered. All work completed to BC Plumbing Code. Same-day service, 7 days a week, 8am to 6pm.

📞 250-207-5488

A blocked drain is not one problem. It’s a category of problems — and the difference between the cheap one and the expensive one is something you can usually spot yourself, before anyone picks up a tool.

The single most useful question is not “which drain is blocked?” It’s “how many drains are affected?” That one answer narrows it down faster than anything else you can do.

Start here — how many drains are affected?

If one fixture is slow, the blockage is almost always local to that fixture. If several fixtures are slow, the problem has moved further down the system. If everything in the house is backing up, it’s the main line, and that one needs a plumber rather than a plunger.

Work through it in that order. It costs you nothing and it tells you whether you’re dealing with a Saturday-morning job or a phone call.

One fixture is slow — what that usually means

A single slow sink, tub, or shower is a local blockage — close to the fixture rather than deep in the system.

In a bathroom that usually means hair combined with soap residue, building up on the stopper mechanism and the P-trap below it. In a kitchen sink it’s cooking fat — which pours as a liquid and sets as a solid on the inside of the pipe, catching everything that comes after it.

Local blockages are the good news scenario. They’re contained, they don’t indicate anything about the rest of your plumbing, and they’re often clearable without opening anything up. The picture changes as soon as a second fixture joins in.

Two or more fixtures are slow — what that usually means

That second fixture is the tell: the blockage has moved past the individual traps and into shared pipework.

The pattern worth paying attention to is which fixtures. If the bathroom sink and the tub are both slow but the kitchen is fine, the problem is in the branch line those two share. If the lowest fixtures in the house go first — a basement shower, a downstairs toilet, a floor drain — that’s gravity telling you the blockage is further down still.

This is the point where DIY starts to have diminishing returns. Clearing a shared branch line properly means reaching past where a plunger or a hand auger will get you.

Every drain is backing up — stop and call

When every drain in the house is slow or backing up at once, the blockage is in the main line, and continuing to run water makes it worse. There is no version of this that gets better on its own.

The tell-tale signs, beyond the obvious:

• Flushing a toilet makes water rise in a nearby tub or shower
• Running the washing machine causes a floor drain or the lowest toilet to overflow
• Sewage smell inside the house
• Water appearing where no fixture is running

At that point, stop using water in the house and get someone out. A main-line blockage is one of the situations that genuinely warrants an emergency plumbing call rather than an appointment next week — because every additional litre has to go somewhere, and it will find the lowest opening in your house.

Main line work is a different toolkit: hand auger and drain snake for most blockages, hydro jetting where the line needs scouring rather than punching through, and a camera where it’s worth seeing what’s actually down there before anyone commits to a repair. That’s the difference between a line that’s been opened and a line that’s actually clear.

One distinction worth making before you call: everything above is about water that can’t get out of the house. If your problem is water getting in — a wet crawlspace, or a soggy patch against the foundation after heavy rain — that’s perimeter drains, weeping tile, and sump pumps, and it’s a different job with a different fix.

The sounds and smells that change the diagnosis

Gurgling. A drain that gurgles — or a toilet that bubbles when a nearby sink empties — is air being pulled through the water in the trap because it can’t get through the vent. That points at a venting issue or a partial blockage downstream, not at the fixture that’s making the noise. It’s worth investigating even if everything is still draining.

Sewage smell with normal drainage. If drains are running fine but there’s a smell, the likely cause is a dry trap — a floor drain or guest bathroom that hasn’t been used in months, letting the water seal evaporate. Run water into it and see if the smell goes. If the smell persists in a fixture you use daily, that’s a different problem and worth a call.

Recurring clogs in the same fixture. A drain that blocks, clears, and blocks again on the same schedule isn’t really clearing. Something further down is catching material, and each “fix” is punching a hole through it rather than removing it.

Safe first steps for a single slow drain

For one slow fixture, before anything else: pull and clean the stopper, and try a plunger with enough water in the basin to cover the cup.

Beyond that, be deliberate about what you put down there. We already have a full post on this — the truth about chemical drain cleaners and whether they’re safe for your pipes — and the short version is that the convenient option is often the one that costs you a pipe. Worth two minutes before you reach under the sink.

One thing worth mentioning when you call: if a chemical cleaner has already gone down and hasn’t worked, say so. It changes how the drain gets opened up safely.

What actually goes down Comox Valley drains

This is the part most drain advice skips, and locally it matters more than the plunger technique.

The Comox Valley Regional District is direct about it: “Only flush human waste and toilet paper.” Everything else on the list they publish — “wipes, facial tissues, diapers, cotton balls, feminine hygiene products, dental floss, paper towels, syringes, and even hair” — is material that doesn’t break down and instead “become stringy and bind together to block pipes.”

Wipes are the specific one worth internalising, because the packaging actively misleads people. Per the CVRD: “Unlike toilet paper, wipes don’t easily break down when flushed, even the ones labelled flushable.” And more pointedly: “Currently in Canada there are no regulations for the word flushable, so you should not flush anything other than human waste and toilet paper.”

That word has no legal meaning in this country. The wipes are not flushable. They’re just sold that way.

Add cooking fat to that list — same mechanism, and it’s why a kitchen drain that slows down on a schedule usually isn’t a coincidence.

Quick reference — reading your symptoms

What you’re seeing	Most likely cause	What to do
One sink or tub draining slowly	Hair, soap, or fat in the trap	Clean the stopper, try a plunger
One fixture blocking repeatedly	Partial blockage further down the branch	Book a drain cleaning — it isn’t clearing properly
Two fixtures in one room slow	Blockage in the shared branch line	Call — past plunger range
Lowest fixtures in the house go first	Blockage further down toward the main	Call, reduce water use
Every drain slow or backing up	Main line blockage	Stop using water, call now
Toilet flush raises water in the tub	Main line blockage	Stop using water, call now
Gurgling drain or bubbling toilet	Venting issue or partial downstream blockage	Book an inspection — don’t wait for a full block
Sewage smell, drains running fine	Dry trap in an unused fixture	Run water into it; call if it persists
Sewage smell with slow drains	Main line issue	Call now

When it’s urgent and when it can wait

One slow bathroom sink can wait for an appointment. A main-line backup cannot, and neither can anything producing sewage inside the house.

We take calls seven days a week, 8am to 6pm, and same-day service is available across Courtenay, Comox, Cumberland, Royston, Union Bay, Fanny Bay, Merville, Black Creek, and Campbell River.

Don’t see your area listed above? Call and ask — chances are we’ll still cover you.

Blocked Drain FAQ

Who should I call for a clogged sink or drain in Courtenay?

A licensed plumber. For a single slow fixture it’s straightforward drain cleaning; for repeat blockages or a main-line backup you want someone with an auger, a drain snake, hydro jetting, and a camera, so the line gets properly cleared rather than temporarily opened. Siegfried Plumbing & Gas covers Courtenay and the Comox Valley to Campbell River — call 250-207-5488.

Why are all my drains slow at the same time?

Because the blockage is in the main line that all of them feed into, rather than in any individual fixture. Stop running water in the house and call — continuing to use water pushes more volume against the blockage.

Is a gurgling drain serious?

It’s worth investigating. Gurgling means air is being drawn through the trap, which usually points at a venting problem or a partial blockage downstream. It often shows up before a full blockage does, which makes it a useful early warning worth acting on rather than waiting out.

Are flushable wipes actually flushable?

No. As the Comox Valley Regional District puts it, “Currently in Canada there are no regulations for the word flushable” — and wipes don’t break down like toilet paper even when the packaging says they do. Only human waste and toilet paper should be flushed.

Do you charge to come and look at a blocked drain?

Estimates are free, and you get clear pricing before the job starts — no surprises on the invoice.

If you’ve read the table above and landed in the “call now” row, don’t wait it out. And if you’re in the “one slow sink” row, it’s still worth getting it cleared properly before it becomes the other kind. Either way, tell us which row you’re in when you call — it points the visit in the right direction before anyone arrives.

Licensed, insured, and WorkSafeBC covered. All work completed to BC Plumbing Code. Free estimates, with clear pricing before the job starts.

📞 250-207-5488