Combi Boiler Installation Calgary
One wall-hung unit for both your heat and your hot water — no storage tank, no second appliance. FlameTech sizes, installs, and commissions combi boilers across Calgary, and we'll tell you straight if your home isn't a good fit for one.
A combi boiler heats your home and makes domestic hot water on demand from the same appliance. For Calgary condos, townhomes, and homes where the boiler and the hot water tank are both near end of life, replacing two appliances with one frees up the mechanical room and cuts a standing tank loss out of your gas bill.
The catch is flow rate. A combi makes hot water as you draw it, so it has a ceiling on how much it can deliver at once — and Calgary's winter mains water comes in cold, which means the unit has to work harder for the same shower. In a big house with three bathrooms running at once, a boiler paired with an indirect tank is usually the better build. We size for the real draw, not the brochure number.
We install combi units from Navien, Viessmann, IBC, and Triangle Tube — gas line, venting, condensate, and commissioning included, with the manufacturer warranty registered on every job. Monthly financing available via Financeit.
Boiler and hot water tank both on their last legs? One combi can replace both — call for a free written estimate.
Call 587-834-3668“Really Appreciated Shaun coming by to carry out an inspection of our boiler. Great advice and a logical follow up plan!”
Devnam Mangat
Calgary · 5 months ago
What a Combi Boiler Actually Does
A conventional setup has two appliances: a boiler that heats water for your radiators, baseboards, or in-floor loops, and a separate tank that stores domestic hot water for your taps and showers. A combi does both jobs in one wall-hung box, and it makes the hot water on demand instead of storing it.
That has real consequences — good and bad — and which side you land on depends on your house.
No storage tank
Nothing sits in your basement keeping 190 litres hot around the clock. You stop paying to reheat water you aren't using, and you get the floor space back.
Hot water doesn't run out
There's no tank to empty, so a long shower stays hot. What a combi can run out of is flow — it can't heat unlimited water per minute, only unlimited water over time.
One appliance to service
One annual service call, one warranty, one set of parts instead of a boiler and a tank aging on separate clocks.
Wall-hung and compact
Most residential combis are roughly the size of a kitchen cupboard and mount on the wall. In a Calgary condo or townhome mechanical room, that difference is the whole reason people call us.
Where Combis Work in Calgary — and Where They Don't
We install a lot of these, and we also talk a fair number of people out of them. Being honest about the fit up front is cheaper for you than discovering the limit in February.
Good fit: condos and townhomes
Limited mechanical space, one or two bathrooms, and hot water demand that rarely overlaps. This is the combi's home turf.
Good fit: boiler and tank both aging out
If your boiler is around the 18-22 year mark and the hot water tank isn't far behind, replacing both with one unit usually costs less than replacing them separately and gives you back a corner of the basement.
Poor fit: high simultaneous hot water demand
Three bathrooms running at once, a soaker tub you actually fill, or a household where two showers and the dishwasher overlap every morning. A combi will keep up with any one of those and struggle with all three at once.
Poor fit: large homes with big heat loss
A combi's heating output is sized for the same unit that's making your hot water. In a large or poorly-insulated home, a dedicated boiler with an indirect-fired tank gives you more headroom on both sides.
The honest alternative
When a combi isn't right, the build we recommend is a modulating condensing boiler paired with an indirect-fired tank. Same flame heats both, but the tank buffers your hot water so simultaneous draws don't fight each other. It costs more and takes more space — and for the wrong house, it's still the right answer.
The Calgary-Specific Part: Cold Mains Water
This is the detail most combi quotes leave out, and it's the one that decides whether you're happy with the unit in January.
A combi's hot water rating is a flow rate at a given temperature rise — how many litres per minute it can lift from incoming cold to shower-hot. In summer, Calgary's incoming water is relatively mild and the unit doesn't have to lift it far, so the flow rate looks great. In deep winter, the water coming into your house is close to freezing. Same unit, same gas input, far bigger temperature rise required — so the litres per minute it can actually deliver drops.
- 01A combi sized on its summer rating will feel undersized every winter, which is exactly when you care about a hot shower.
- 02We size against the winter temperature rise, not the best-case number on the spec sheet. That sometimes means recommending a larger unit than the brochure math suggests.
- 03It also means being blunt about the ceiling: if the winter flow rate won't cover two simultaneous showers, we tell you before you buy, not after.
- 04Some combi models include a small internal buffer or built-in recirculation that softens the delay on a hot water draw. Worth the upgrade in homes with a long run from the mechanical room to the ensuite.
What We Deal With During a Calgary Combi Install
Gas line capacity
A combi has to make heat and hot water at the same time, so its gas input is typically higher than the boiler it's replacing. Plenty of Calgary homes have a gas line sized for an older, lower-input unit. We check line size and total household load at quote time and upsize the run when the numbers require it.
Venting
Condensing combis vent through plastic sidewall pipe, not the old brick chimney. Older Calgary homes usually need a new vent run cut and sealed to code, with the intake and exhaust spaced to manufacturer spec so the unit isn't breathing its own exhaust in a cold snap.
Hard water and the hot water exchanger
This is the big one. Calgary's hard water scales up any heat exchanger, and a combi's domestic hot water exchanger has small passages that scale faster than a boiler's. A water softener upstream isn't a nice-to-have on a combi — it's the single thing most likely to determine whether the unit reaches its expected service life. We say the same thing on every combi quote we write.
Condensate in an unheated space
Condensing units produce acidic condensate that has to run through a neutralizer to a drain. If that line runs through an unheated or poorly-insulated part of a Calgary basement or garage, it can freeze and lock the unit out on the coldest night of the year. We route and protect it properly at install.
Removing the old tank
When we consolidate, the old hot water tank gets drained, disconnected, and hauled away, and the orphaned water and vent connections get capped properly rather than left hanging in the wall.
Combi Brands We Install in Calgary
We install and register the manufacturer warranty on every unit we put in. The right brand depends on the flow rate you need and the space you have — not on which one we happen to have on the truck.
Navien
The NCB combi line is the most common combi we install in Calgary. Stainless steel heat exchangers hold up well against our water, and the wall-hung footprint suits tight condo mechanical rooms. Strong on domestic hot water flow for the size.
Viessmann
German-engineered, with modulating burners that throttle down cleanly on mild shoulder-season days instead of short-cycling. The unit we recommend when the budget allows and you plan to stay in the house.
IBC Technologies
Canadian-engineered for prairie conditions and prairie water chemistry. A sensible pick when you want a combi built with Alberta's climate in the design brief rather than adapted to it.
Triangle Tube
Strong on combi and tank-paired builds, with stainless construction and long warranty coverage. Their Prestige Excellence line blurs the line between a combi and a boiler-plus-indirect, which is useful in homes right on the edge of the flow-rate decision.
Calgary Combi Boiler FAQs
What does a combi boiler installation cost in Calgary?
It depends on the unit, your gas line capacity, the venting run, and whether we're replacing just a boiler or consolidating a boiler and a hot water tank into one appliance.
We don't quote combi installs over the phone, because the number would be wrong. We come out, run the heat-loss and hot water demand calculations, look at your gas line and mechanical room, and give you a free written estimate with the model, the output, and the full scope in it. Financeit monthly payments are available if you'd rather not pay it in one go.
Can a combi boiler really replace my boiler and my hot water tank?
Yes — that's the whole point of one. The combi heats your home and makes your domestic hot water from the same appliance, so the storage tank comes out entirely.
The qualifier is hot water demand. A combi makes hot water on demand rather than storing it, so it has a ceiling on how much it can deliver at once. In a home with one or two bathrooms and demand that doesn't overlap much, that ceiling never gets hit. In a home where two showers and the dishwasher run at the same time, it will. We check that before recommending one.
Will a combi boiler run out of hot water?
Not in the way a tank does. A tank holds a fixed volume, and when you drain it you wait for it to reheat. A combi has no tank to empty, so a long shower stays hot indefinitely.
What a combi can run out of is **flow** — litres per minute. If you open more taps than the unit can heat at once, the temperature at each one drops. That's a sizing question, and it's why we count fixtures instead of guessing.
Do combi boilers work in Calgary's winter?
They do, but the winter is exactly why sizing matters here.
A combi's hot water rating assumes a certain temperature rise. Calgary's incoming mains water is near freezing in deep winter, so the unit has to lift it much further than it does in July — and the flow rate it can actually deliver drops accordingly. A combi sized on its summer number will feel weak every January.
We size against the winter temperature rise. Sometimes that means recommending a bigger unit than the spec sheet implies, and we'd rather have that conversation at the quote than after your first cold snap.
Do I need a water softener with a combi boiler?
We recommend it on every combi we install in Calgary, and we're more insistent about it here than on a standard boiler.
The reason is the domestic hot water heat exchanger. It has small passages, and it sees fresh, unsoftened city water every time you open a tap — unlike the heating loop, which circulates the same water over and over. Calgary's hard water scales those passages up, efficiency drops, and eventually the exchanger fails.
A water softener upstream is the cheapest thing you can do to protect the unit.
What is the "cold water sandwich"?
It's a real quirk of on-demand hot water. If you turn a tap off and back on quickly, the water sitting in the pipe is still hot, then a slug of cold arrives behind it while the combi fires back up, then the hot catches up. You get hot, cold, hot — the sandwich.
Modern combis have largely engineered it out with internal buffers and better burner response, and models with a small buffer tank or built-in recirculation essentially eliminate it. It's worth knowing about, and worth asking us which model you're getting.
How long does a combi boiler installation take?
A straight combi swap is usually a single day, roughly 6-10 hours. Consolidating a boiler and a hot water tank into one combi, or an install that needs a gas line upsize and a new vent run, more often runs into a second day.
We give you the timeline in writing with the quote, and we don't leave a Calgary home without heat overnight in winter.
How long do combi boilers last in Calgary?
Comparable to a good condensing boiler when they're looked after — but the maintenance matters more, because the domestic hot water exchanger is the wear point.
The two things that decide it: a water softener upstream to keep scale out of the exchanger, and an annual boiler service that actually includes a descale of the hot water side rather than just a combustion check. Skip both in Calgary's water and you'll shorten the unit's life considerably.
Do I need a permit to install a combi boiler in Calgary?
Yes. Gas-fired appliance installations in Calgary require a gas permit and inspection. FlameTech pulls the permit and books the inspection as part of the job — it's not something you need to chase.
Monthly Financing Available
Spread the cost into manageable monthly payments.
Spread the cost of your new combi boiler into flexible monthly payments via our Financeit partner.
Simple, honest, on your schedule.
The install itself is a day's work. The part that decides whether you like the system for the next 20 years happens before we order the unit.
Heat loss and hot water demand
Two calculations, not one. We run a heat-loss calc against Calgary's −40°C design temperature for the heating side, then count your fixtures and simultaneous draws for the domestic hot water side. If the numbers say combi is the wrong tool, we say so.
Quote, gas, and permits in writing
Model, output, gas line and venting scope, and the all-in price before anything is ordered. Combis draw more gas than the boiler they replace, so we check gas line capacity at quote time rather than discovering it mid-install. Gas permit and inspection are ours to handle.
Remove, hang, and pipe
Old boiler drained and pulled, hot water tank removed if we're consolidating, new combi hung, gas line upsized where needed, venting run, condensate routed through a neutralizer to drain. Heating loop and domestic hot water are tied in and pressure-tested.
Commission and walk through
Combustion analysis, hot water temperature and flow checked at the taps, thermostat paired, controls explained. We register the warranty and book the first annual service.
Combi boilers, Calgary mechanical rooms.
Wall-hung combi units we've installed around Calgary — heat and domestic hot water from one appliance, piped and vented to spec.
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