Combi boiler installation in Burnaby: permits, sizing and what to expect

A combi boiler installation in Burnaby is a system project, which is why the work starts on paper. The combi heats the closed hydronic loop that serves the home's radiators, baseboards or in-floor loops, and it makes domestic hot water on demand: cold supply runs through a plate heat exchanger while the burner fires, so hot water is produced at the rate the appliance can deliver rather than held in a tank. That single wall-hung appliance, with no cylinder beside it, is the reason combis fit Burnaby's townhouses, secondary suites and compact homes.

The installation scope covers the appliance, its sealed vent and combustion-air path, the condensate route, the gas connection, the near-boiler piping and circulator, the domestic-water connections and isolation valves, the controls and thermostats, and the commissioning that confirms safe operation. Whether a combi is the right appliance — rather than a heating-only boiler with an indirect tank — comes out of the design, after the heating load and the hot-water draw are both known.

Yes. Burnaby is one of the BC municipalities that issue their own gas permits. The city's residential trade permits page states that installing, modifying or upgrading any part of a gas system in single and duplex dwellings requires a Gas Permit, and that its forms cover complete installations, piping, repair and replacements, and venting and hook-ups. Permits for gas installation of over 409,000 BTU are obtained from the Provincial Safety Authority — Technical Safety BC — instead. A combi connects a gas appliance and its sealed venting, so the gas permit is in scope.

Burnaby also runs a separate heating permit stream: installing or replacing heating and cooling systems in single and duplex dwellings requires a Heating System Permit, and the city publishes a Plumbing and Hydronic Heating Permit application for the hydronic side. Applications can be made in person and, for electrical, gas and plumbing permits, online through the city's My Permits Portal, which also handles inspection booking. Technical Safety BC still oversees gas contractor licensing and gas fitter certification in the city, and its homeowner gas permit route is limited to qualifying single-family owners — strata and duplex owners must use a licensed contractor, who applies on their behalf.

A combi answers two loads and so needs two sizing decisions. The heating side comes from a heat-loss calculation that works room by room through the building envelope — walls, windows, insulation, air leakage, orientation and design temperature — plus the emitter requirements. Floor area alone is not a sizing method, and an oversized boiler short-cycles, condenses less and wears faster. Natural Resources Canada describes a hydronic system as a heat generator, heating units in the rooms and a pump that circulates water between them, so the boiler and the emitters must be matched as one system.

The hot-water side is different, because a combi stores nothing. Its ceiling is its continuous delivery rate: the flow it can keep heated through the temperature rise between the incoming supply and the setpoint, and that rate drops as the incoming water gets colder in winter. The design question is the household's actual draw pattern — how many showers, whether they overlap, and whether laundry or a dishwasher runs at the same time — not the number of bathrooms on its own. The published continuous-delivery figures for each documented combi model on this site are the honest test, and in a Burnaby secondary suite the draw is usually modest and sequential, which is the pattern a combi handles best.

Burnaby's range of housing shapes the combi question. Townhouse complexes around Brentwood, Lougheed and the city's newer developments commonly use wall-hung appliances; many already run in-floor radiant loops, and those low-temperature emitters pair naturally with a condensing combi when the loops and zones are balanced. Secondary suites and garden-level units are another strong fit, because a combi gives the suite its own heat and hot water without a separate tank.

The older neighbourhoods, including Capitol Hill and Burnaby Heights, still hold 1950s bungalows with cast-iron boilers and radiators, and those homes can take a combi where the emitters deliver the building's heat at lower water temperatures and the household's draw is modest. A larger detached home with several bathrooms and heavy simultaneous hot-water use may be better served by a heating-only boiler with an indirect tank, and the assessment decides that. Burnaby is also home to IBC Technologies' Canadian head office, one of the condensing boiler brands documented on this site, and the combi models in that catalogue are the kind of wall-hung units common in Burnaby townhouses. Whatever the housing type, the design questions are the same: heat loss for the building, draw pattern for the hot water, and a vent route that fits the mechanical space.

A condensing combi cannot vent into an unlined masonry chimney. It uses sealed venting to an exterior terminal that respects the manufacturer's clearances and maximum equivalent length, and that route frequently decides where the appliance can hang — a particular consideration in a townhouse, where the terminal shares a wall with a deck, a walkway or a neighbour's window. The cooling flue gases also produce condensate, mildly acidic water that must drain to a suitable point, often through a neutraliser, without freezing in an unheated space.

The domestic-water side adds its own requirements. Combis are piped so the potable side can be isolated and serviced without shutting off the home's water, and the manual's stipulations for those isolation valves, for backflow protection and for any mixing or tempering valve belong in a compliant installation. Venting, condensate and the domestic-water connections are the items most likely to explain why two quotes for the same combi differ, and why a new installation needs a site assessment rather than a phone estimate. Natural Resources Canada notes that a plugged condensate drain can cause water damage in the house, so the drain path is part of a safe installation rather than an afterthought.

A well-run Burnaby combi installation follows a fixed order. The assessment and heat-loss calculation come first and set the output and emitter requirements, with the hot-water draw checked alongside them. Then the combi model, controls and zoning are chosen, and the permit path is confirmed for the property: the city gas permit, the heating-system permit where the scope calls for one, and the plumbing and hydronic permit where the water side is altered.

On site the rough-in precedes the appliance: venting, gas piping, water connections, the condensate route and the electrical supply are installed and tested, then the boiler is set, connected, filled and purged. Commissioning follows with combustion analysis and control set-up within the manufacturer's specification, including the domestic hot-water settings, and the inspections close the permits. The handover collects the permit records, the commissioning report and the warranty registration together.

A combi installation goes more smoothly when the mechanical space and the carry route are ready before the crew arrives. Clear the area around the existing boiler and the path the old and new equipment will travel, make sure the gas meter and its shut-off are accessible without touching the gas supply, protect finished floors and stair treads along the carry route, and keep children and pets clear of the work area. Point out anything unusual before work starts — asbestos insulation on an old boiler, previous water damage, or a finished wall in the planned vent route — so it is handled properly rather than discovered mid-job. If the existing appliance still has its documents, have them ready, and decide in advance where the new paperwork will be kept.

Burnaby's housing adds its own steps. In a townhouse or strata building, book the elevator or loading area, give the building the notice its bylaws require, and check the rules about work hours and parking, because the vent terminal and the condensate route may touch common property or a shared wall. In a home with a secondary suite, tell the tenants in advance that heat and hot water will be off while the system is drained, the old appliance is removed, the combi is installed and the system is refilled and purged. Confirm where the new condensate will drain and that the route will not freeze in an unheated space or an exterior wall, because Natural Resources Canada notes that a plugged condensate drain can cause water damage in the house.

On the day itself the sequence is stable: the system is isolated and drained, the old boiler and any storage tank are removed, the combi, its sealed vent and the condensate route are installed, gas and water are connected and tested, and the boiler is commissioned with combustion readings before the controls and domestic-hot-water settings are completed. A written proposal states the expected duration for the property rather than a guaranteed time, because access, the vent route and any hydronic changes decide how long the work takes. The passed permits, the commissioning report and the warranty registration belong together afterwards, because that file is what the first annual service and any future warranty claim will be checked against. If a gas odour or a carbon-monoxide alarm occurs at any point, leave the building and call the FortisBC emergency line at 1-800-663-9911 or 911 from outside before anything else.

A large share of Burnaby combi work happens in townhouse complexes and strata buildings, where the appliance sits in a closet or a small mechanical space and the building itself has a say in the project. The technical questions are the same as in a detached house — heat loss, hot-water draw, venting and condensate — but the process adds a layer: the work may touch common property or a shared wall, the vent terminal has to respect its clearances to a neighbouring window, deck or walkway, and the building's approval process runs alongside the city permits. A strata owner also cannot use Technical Safety BC's homeowner gas permit route, so the work is done by a licensed contractor who applies for the permits on the owner's behalf.

Townhouse complexes around Brentwood, Lougheed and the newer developments often already run in-floor radiant loops, and those loops are where a combi either performs well or underperforms. Low-temperature radiant pairs naturally with a condensing combi, but only when the loops and zones are balanced and a mixing valve protects the floor. Where the complex has a shared boiler plant rather than in-suite appliances, the project is a building plant replacement rather than a combi installation, and it is planned around keeping heat and hot water available for residents. In either case, the vent route and the condensate drain are what decide whether a particular suite or closet can take a combi, so they are confirmed in the assessment rather than after the appliance is ordered.

Burnaby's older neighbourhoods, including Capitol Hill and Burnaby Heights, still hold 1950s bungalows with cast-iron boilers feeding radiators, and many of those homes are candidates for a combi conversion. The conversion removes the old boiler and its vent connector, and the storage tank where the home is giving up stored hot water, and replaces them with a single wall-hung appliance. The combi needs a sealed vent and combustion-air run to an exterior terminal, a condensate route to a suitable drain, a gas connection sized for its input, and reworked domestic-water connections with isolation valves. The hydronic loop is cleaned and purged, and a strainer or filter is worth planning on an older system that may carry debris toward the new heat exchanger.

The permit path for a conversion is broader than for a new appliance in a new home. Burnaby requires a Gas Permit for installing, modifying or upgrading any part of a gas system in single and duplex dwellings, a Heating System Permit for installing or replacing the heating system, and its plumbing and hydronic stream where the water side is altered. Because a conversion changes the system rather than matching an old appliance like for like, the heating-system permit is part of the package. Where the emitters are generous cast-iron radiators, they can often run at the lower water temperatures a condensing combi wants, which is the best case for efficiency; where they are not, the assessment may point to a heating-only boiler with an indirect tank instead. A home with a hot-water recirculation loop also needs that loop reviewed, because a combi holds no tank of hot water to circulate.

Controls decide whether a combi installed in Burnaby performs the way its efficiency rating suggests. Natural Resources Canada describes a hydronic system as a heat generator, heating units in the rooms and a pump that moves water between them, with zones switched on and off by thermostat-operated valves. The same logic applies to a combi: the appliance is only one part of the system, and the controls are what let it run long and cool rather than short and hot.

Outdoor reset, also called weather compensation, lowers the supply temperature as the outdoor air warms so the boiler condenses for more of the year, which is where a condensing appliance earns its efficiency. Zoning divides the home into separately controlled areas so bedrooms, living space and a basement or secondary suite are not heated as one. Natural Resources Canada notes that balancing is done with manual and thermostatic radiator valves and that those valves are not used on series loops, which is why adding zones or emitters can leave a system uneven until it is rebalanced.

Burnaby's townhouse complexes and newer developments often run in-floor radiant loops, and those loops are where the controls matter most. Low-temperature radiant pairs naturally with a condensing combi, but only when the loops and zones are balanced and the floor is protected from water that is too hot, usually by a mixing valve or an equivalent control. Thermostats belong to the same system: a programmable schedule that matches the household's hours is a routine part of commissioning a combi, and the domestic-hot-water settings are set at the same time. A combi installation is the moment to commission the controls, the zoning and the hot-water side together, because a well-chosen appliance on poorly set controls is an expensive way to heat a home.

A combi is wall-hung and sealed, which is why it suits the closets, utility rooms and compact mechanical spaces common in Burnaby townhouses and secondary suites, but the location still has to satisfy the appliance's published requirements. The model's manual sets the clearances around the cabinet for combustion air and for service, so the appliance needs enough room to be opened and worked on, not just enough wall to hang it. Whether a closet, a utility room or a garage is suitable depends on those clearances and on the temperatures the model is rated for.

The vent terminal is usually the deciding detail in a Burnaby townhouse or a home with a suite. A condensing combi vents cool, wet flue gases through certified plastic pipe to an exterior terminal, and the terminal has to meet the manufacturer's clearances to windows, doors, intakes, decks and walkways, as well as the maximum equivalent length for the pipe size. In a row of attached homes, or where a neighbour's window or a shared walkway sits close, that is a design question rather than an afterthought, and it is settled before a model is chosen.

Condensate is the third siting constraint. The mildly acidic water has to drain to a suitable point, often through a neutraliser, and the route must not freeze; Natural Resources Canada notes that a plugged condensate drain can cause water damage. A route that passes through an unheated garage or an exterior wall needs a plan, and a home with no floor drain near the boiler needs one arranged before installation rather than after. Siting, venting and condensate are checked together at the assessment because a location that satisfies one can fail another.

A combi installation quote is only comparable when it covers the same scope, so the inclusions are worth checking before the bottom line is compared. A complete Burnaby combi quote should name the appliance and its output, the sealed vent and combustion-air run to an exterior terminal that meets the model's published clearances and maximum equivalent length, the condensate route to a suitable drain, often through a neutraliser, and the gas connection sized for the appliance's input.

Inside the home the scope should cover the near-boiler piping and circulator, the domestic-water connections with isolation valves so the potable side can be serviced without shutting off the house, the controls and any zoning, and commissioning with combustion readings within the manufacturer's specification. It should also state the permits plainly: Burnaby's Gas Permit for the gas system work, the Heating System Permit for installing or replacing the heating system, and the Plumbing and Hydronic Heating Permit where the water side is altered.

Just as important are the exclusions, because they are what a low headline number often leaves out. Electrical upgrades, hydronic work such as flushing or adding a strainer, a gas-line or meter upgrade, making good after the vent run, and any strata approval or building coordination may sit outside the base price, and a quote that is silent about them is not yet comparable. Boilers.ca publishes no prices: the instant estimator gives a planning range for the work involved, and a written estimate itemises the scope after the assessment. Ask for the inclusions and exclusions in writing before approving a Burnaby combi installation.

ROMA Heating & Cooling is a Technical Safety BC licensed gas contractor based in Burnaby. On a combi installation ROMA documents the building and any existing system, performs the heat-loss assessment, works through the hot-water draw with the homeowner, proposes equipment sized to both loads, applies for the city permits the job requires, installs the appliance, venting, condensate, gas and domestic-water connections, and commissions the boiler with combustion readings before handover.

The consultation and selection services on this site are where equipment and hot-water options are worked through before anything is ordered, and the installation, commissioning and inspection services carry the project to closed permits. Where the assessment shows that the household's simultaneous hot-water demand exceeds what a combi can sustain, the sound answer may be a heating-only boiler with an indirect tank; the trade-offs are set out in the combi-versus-system guide on this site, and the assessment decides which applies.

When a Burnaby combi installation is finished, three documents should sit together with the appliance: the passed permit and inspection records, the commissioning report with its combustion readings, and the warranty registration. The permit record is the proof that the boiler was installed and tested under permit, and it is what a future technician, buyer or insurer will ask for; in Burnaby that record may be a city gas permit together with the heating-system permit where the scope required one.

Installation is also where routine care begins. Because annual servicing is commonly a warranty condition, and because FortisBC recommends regular maintenance by a licensed gas contractor, a service visit each year is the natural follow-up to a new combi. Natural Resources Canada describes a fall heating check-up that covers gas connections, gas pressure, burner combustion and the heat exchanger, and notes that a plugged condensate drain can cause water damage — so the condensate path is worth keeping clear alongside the vent and intake terminals. A combi's domestic side deserves the same attention, which is one reason the maintenance service on this site covers the appliance as a whole.