Bosch Tankless Water Heater product selection in Greater Vancouver

The most common tankless mistake we see in Metro Vancouver homes is not a bad brand choice. It is a good unit sized for a July shower and installed in a house that runs its hot water in January, on a gas line that was sized for a fifty-year-old atmospheric tank.

Bosch sells more than one kind of tankless water heater. There are condensing gas units, non-condensing gas units, small electric point-of-use heaters, and combination appliances that make domestic hot water and feed a heating loop. They are not interchangeable, and the one that suits a Kitsilano character house with a brick chimney is rarely the one that suits a Surrey townhouse with a sidewall vent and a strata council.

This guide walks the selection the way a HeatLand technician walks it on site: demand first, water temperature second, then the building itself. Call (604) 330-3812 for a free written no-obligation estimate once you know which questions matter for your home.

Start with what runs at the same time, not the number of bathrooms

Bathroom count is a lazy proxy. What actually loads a tankless heater is simultaneous draw: a shower running while the dishwasher fills and someone rinses at the kitchen sink. Sit down and list the fixtures in your house, then write down which combinations genuinely happen in your household on a weekday morning. In a lot of two-bathroom homes the honest answer is one shower plus a sink. In a house with teenagers, two showers overlap most mornings and that changes the model entirely.

Flow matters more than fixture count. A low-flow shower head and a rain head with a body spray are both ‘one shower’ on paper and nothing alike in practice. If you have a soaker tub, that tub is the real design load, because filling it is a long continuous draw at high flow while everything else in the house still wants hot water.

Write the number down in litres per minute if you can. Manufacturer flow ratings for any given Bosch model are published on that model’s spec sheet, and the honest way to size is to compare your worst realistic simultaneous draw against the published flow at your required temperature rise, not against the headline flow figure printed at a small rise.

We also ask about habits that do not show up on a fixture list. Long showers back to back. Laundry on hot. A home office where someone showers at noon. A tankless unit sized to a spreadsheet and not to a household is the one that gets complained about.

Temperature rise is the number that decides the model here

A tankless heater does not have a fixed output. It has a fixed heat input, and how much water it can deliver depends on how far it must raise that water’s temperature. This is the single most misunderstood spec in the category, and it matters more in the Lower Mainland than most people expect.

Our incoming municipal water is not the same in February as it is in August. It arrives colder in winter, so the same unit that felt limitless during the summer feels tight during the first real cold snap. Homes fed from different sources across Metro Vancouver do not all see the same inlet temperature either, and a home on a well or on a long buried service line in Langley or Maple Ridge can behave differently again from a downtown condo.

The practical approach: pick your target hot water temperature at the tap, subtract the coldest inlet temperature your home realistically sees, and use that rise when you read the flow chart on the Bosch spec sheet. Size to winter, not to the average.

This is also why the honest answer to ‘will this unit run two showers’ is sometimes yes in September and no in January. A technician who tells you a model handles two showers without asking about temperature rise has skipped the only calculation that matters.

If you are borderline, the choices are a larger single unit, two units piped together, or accepting that one draw yields when another starts. All three are legitimate. Guessing is not.

Condensing versus non-condensing Bosch gas units

Bosch’s gas tankless lineup splits into condensing models and non-condensing models, and the split drives almost everything downstream of the appliance.

A condensing unit pulls extra heat out of the flue gases, which cools the exhaust enough to vent through plastic pipe and produces acidic condensate that has to go somewhere. A non-condensing unit runs hotter exhaust, needs approved metal category-appropriate venting, and produces no meaningful condensate. Neither is universally ‘better’. They fit different buildings.

Condensing tends to win when the unit is going into a finished basement or a utility closet where you want a short, cheap, flexible vent run, when you have a floor drain or a practical condensate route, and when you plan to keep the home long enough for lower fuel use to matter. Efficiency is rated under a published rating system, and you should read the actual certified numbers for your exact model on the manufacturer’s spec sheet or AHRI listing rather than trusting a sales figure.

Non-condensing tends to win when there is an existing suitable metal vent path you can reuse, when the install is in an unconditioned space where condensate would freeze, or when the budget for the whole project is the limiting factor and the venting route is straightforward.

One caution about older Vancouver houses: you cannot assume a chimney that served an old atmospheric tank is usable for a modern tankless unit. Sometimes it can be lined and reused, sometimes it cannot. That gets determined on site, not from a catalogue.

Where a Bosch electric tankless actually belongs

Bosch also makes small electric tankless and point-of-use heaters, and homeowners often ask whether they can skip gas entirely. Sometimes yes. Usually not for whole-house service.

Electric point-of-use units are excellent at a specific job: a bar sink far from the mechanical room, a garage utility sink, a laneway suite powder room, a basement bathroom at the end of a long branch where you currently wait a minute for hot water. Mounted under the counter, one of these kills the wait without touching the main system.

Whole-house electric tankless is a different conversation, and the constraint is almost never the appliance. It is the electrical service. Heating a full shower flow through the winter temperature rise we see here draws serious current, and many Metro Vancouver homes, especially older ones with a modest main panel and a heat pump or EV charger already added, do not have the spare capacity. Adding capacity can mean a panel upgrade or a service upgrade with the utility, which changes the project’s scope and timeline completely.

What we do on site is check the panel rating, count the existing loads, and look at what else the homeowner plans to add in the next few years. If a heat pump and a car charger are coming, spending your remaining capacity on water heating is a decision worth making deliberately.

Any electrical work here is licensed-electrician territory with its own permit. It is not a homeowner job, and it is not something to discover after the water heater has been ordered.

Gas supply: the thing that quietly disqualifies half the models

A tankless gas unit fires at a much higher input than the tank it replaces, because it has to make heat on demand instead of slowly over an hour. That means the gas piping and the meter feeding it get evaluated before any model gets recommended.

Three things get checked. The meter’s capacity, because the sum of every gas appliance in the home has to fit inside it once the tankless unit is running at full fire alongside the furnace, range, dryer and fireplace. The pipe size and total developed length from the meter to the appliance location, because a long undersized run starves the burner and produces intermittent faults that look like an appliance defect. And the gas pressure available under load, measured, not assumed.

This is where a job’s scope often grows. Upsizing the line from the meter to a basement mechanical room, or getting the meter itself changed by the utility, is common on older Vancouver, Burnaby and New Westminster housing stock. It is not a sign that something is wrong with your home. It is a sign the home was piped for the appliances of its era.

Gas fitting in British Columbia is regulated work requiring a Technical Safety BC gas certification and, for most of these installations, a permit. It is not a homeowner job and it is not a handyman job.

If you ever smell gas, leave the home first, then call the gas utility and a licensed technician from outside. Do not go looking for the source yourself.

Venting: the route, the terminal and the neighbour’s window

Venting decides more Bosch model selections in this region than efficiency does. Before you compare units, look at where the appliance can physically go and where its exhaust can legally terminate.

A condensing unit’s plastic venting is light, comes in smaller diameters, and can often run horizontally out a sidewall, which is why it suits interior closets and finished basements. A non-condensing unit needs approved higher-temperature venting with its own clearance rules. Concentric venting, where intake and exhaust share one penetration, is frequently the cleanest solution in a tight townhouse wall.

Termination clearances are the part homeowners rarely anticipate. Exhaust cannot terminate too close to an operable window, a door, a mechanical air intake, a gas meter, or under a deck or soffit where the plume gets trapped. On narrow Vancouver lots, the clearance to the property line and to the neighbour’s windows genuinely constrains where the vent can come out, and in some cases that pushes the appliance to a different wall or a different room entirely.

Sealed combustion also matters. A direct-vent unit that pulls its combustion air from outside is much better behaved in a tight modern home than one drawing air from a small closet, because the closet cannot supply it and you get incomplete combustion or nuisance shutdowns.

The visible plume is worth mentioning too. Condensing exhaust is cool and steamy in our damp winters, so aiming a sidewall terminal at a patio, a walkway or the neighbour’s kitchen window creates a complaint you will hear about.

Condensate: small pipe, big consequences

If you choose a condensing Bosch unit, the appliance will produce liquid condensate whenever it runs, and that liquid is acidic. Where it goes is a design decision made before the unit is mounted, not an afterthought.

The simple case is a mechanical room with a floor drain below the appliance. Gravity does the work, a neutralizer sits inline, and there is nothing to fail. The harder cases are common in Metro Vancouver: a unit on a main-floor closet wall with no drain nearby, a slab-on-grade home in Richmond or Delta with no accessible drainage, or a garage installation where any small-bore drain line is exposed to freezing.

When gravity is not available, a condensate pump moves the liquid to a suitable drain. That pump needs a receptacle, and it introduces one more component that can eventually fail, so it should be somewhere you can hear it and reach it, ideally with an overflow safety switch that shuts the appliance down rather than letting water find your drywall.

Neutralization matters for the plumbing it discharges into. Cast iron waste lines in older houses do not enjoy a steady acidic drip. A neutralizer cartridge is cheap and needs periodic media replacement, so it belongs somewhere serviceable, not buried behind finished wall.

Run the tubing so it drains continuously with no sag, no long horizontal flat runs, and no place a bit of biofilm can dam it. A blocked condensate line usually presents as an appliance that will not stay running, which sends people looking for a fault in the wrong place.

Recirculation and the wait for hot water

Tankless does not mean instant. It means endless. Those are different promises, and the confusion produces more disappointment than any spec on the sheet.

The water sitting in the pipe between the appliance and your bathroom is cold until you have drawn it out. In a three-storey Vancouver house with the mechanical room in the basement and the ensuite at the top, that wait can be long, and swapping a tank for a tankless unit does not shorten it. Some Bosch models have provisions for recirculation. Some do not. If short wait times matter to you, this belongs on your must-have list before you compare capacities.

There are three practical approaches. A dedicated return line back to the appliance is the best-performing and easiest to justify during a renovation when walls are open. A crossover valve at the farthest fixture uses the cold line as the return and can be retrofitted without opening walls, at the cost of slightly warm cold water at that fixture for a moment. Or you accept the wait and put a small point-of-use heater at the one fixture that bothers you.

Control strategy matters more than hardware. A recirculation pump running continuously wastes energy and cycles the appliance constantly. A timer matched to your morning and evening routine, or an on-demand button in the bathroom, gives you most of the benefit for a fraction of the running cost.

Decide this before the model is chosen. Retrofitting recirculation onto the wrong unit is expensive.

Combi units: one appliance for hot water and heating

Bosch offers combination appliances that make domestic hot water and also supply a heating loop, and in the right home they are a strong answer. In the wrong home they create a compromise you live with for fifteen years.

Combis fit best where the heating load is modest and well matched to the appliance: a townhouse, a smaller or well-insulated house, a laneway home, or a home heated with in-floor radiant or low-temperature panel radiators. They fit poorly where an oversized heating load forces you to buy a bigger appliance than your hot water needs, or where an old high-temperature cast iron radiator system wants water temperatures that undercut the efficiency you paid for.

The honest trade-off is priority. A combi generally prioritizes domestic hot water, so during a long shower the space heating pauses briefly. In a well-insulated home nobody notices. In a drafty older house on a cold January morning, some people do.

Check the heating side numbers on the specific model’s spec sheet against a real heat loss calculation for your home, not a rule of thumb per square foot. A Lower Mainland heat loss is not a Prairie heat loss, and our milder winters mean a properly calculated load is often smaller than homeowners assume.

One appliance instead of two also means one point of failure, one venting penetration, one service visit and one warranty. Whether that consolidation is an advantage or a risk depends on how you feel about having no heat and no hot water at the same time.

Strata, townhouses and shared walls

If you live in a strata, the appliance selection is only half the project. The other half is approval, and it can take longer than the installation.

Exterior walls in a strata are usually common property. Cutting a new vent penetration, or changing the size or location of an existing one, generally requires written approval from the strata council, often with details of the terminal location and sometimes a form for alterations to common property. Start that conversation early. A model that needs a new penetration on a wall the council will not allow is not a candidate, no matter how well it suits the household.

There are practical constraints too. Many townhouse mechanical closets were built around a specific tank footprint, and while a wall-hung tankless unit usually frees floor space, it needs clearances around it for service access and combustion air. Some closets have a louvered door that was sized for an atmospheric appliance and needs rethinking with sealed combustion.

Exhaust termination near a neighbour’s patio or window becomes a bylaw and a neighbour-relations issue in a way it never is on a detached lot. In our damp winters the visible plume is noticeable, and ‘it meets clearance’ is not the same as ‘nobody complains’.

Get the depreciation report or building envelope details if the strata has them, particularly for buildings with rainscreen or restoration history. Cutting into a remediated envelope has its own protocol, and doing it without approval can put liability on you rather than the corporation.

Swapping out an existing tank: what really changes

Replacing a conventional tank with a Bosch tankless unit is rarely a like-for-like exchange, and the scope difference is where quotes diverge wildly.

What almost always changes: the gas line, because the tankless input is higher. The venting, because the old atmospheric flue is usually not appropriate. The water connections, because a wall-hung appliance sits at a different height with different port locations. The electrical, because a modern tankless unit needs a dedicated receptacle where an old tank needed nothing.

What sometimes changes: the location itself. A tankless unit is small enough to move somewhere better, closer to the bathrooms, or out of a closet you would rather use for storage. That freedom is one of the real advantages, but every metre of relocation adds pipe and vent.

What you gain beyond capacity: floor space, no standing tank of water to eventually leak on a finished floor, and no standby loss from keeping stored water hot around the clock.

What you take on: annual maintenance that a tank never really demanded, a more complex appliance with electronics, and a hard stop if the power goes out, since the controls and fan need electricity.

One warning about timing. Homeowners often decide to go tankless the day their tank fails, under pressure, with cold showers in the house. That is the worst moment to evaluate gas sizing and venting properly. If your tank is aging, have the assessment done while it is still working.

Water quality, coastal air and the maintenance you signed up for

Two local realities affect how a Bosch tankless unit ages here, and they pull in different directions.

Our water in most of Metro Vancouver is soft. That is good news for scale, and it means the aggressive descaling schedules quoted by installers in hard-water regions do not translate directly. It does not mean maintenance is optional. Flushing the heat exchanger, cleaning the inlet filter screen, checking the burner and flame sensor, inspecting the venting and confirming the condensate path is clear all keep the appliance behaving predictably.

The inlet screen is the one homeowners underestimate. Sediment from a municipal main disturbance, or debris from soldering during a nearby renovation, ends up there, and a partially blocked screen reduces flow enough to make the unit behave as though it is undersized.

Salt air is the other factor. Homes close to the water in West Vancouver, White Rock, Steveston or along the Fraser see accelerated corrosion on any exposed metal, including vent terminals and outdoor components. Stainless or coated terminations, and a look at the terminal during annual service, are worth specifying.

Specify isolation and service valves at installation. They cost little as part of the original install and turn a future flush into a straightforward visit rather than a plumbing exercise. Any competent quote includes them, and their absence is a useful signal about the rest of the work.

Book the service in the shoulder season. Fall service lines get busy right when you need hot water most.

Controls, fault display and running more than one unit

Modern Bosch tankless units carry a control board, a display and, on many models, connectivity or an optional remote controller. These are not gimmicks. They change how the appliance gets diagnosed.

A remote controller in a living space lets you set the delivered temperature accurately, which matters for scald safety with small children and for anyone who has fought with a mixing valve. Set the temperature at the appliance to what you actually want at the tap rather than running it hot and mixing it back down at every fixture.

When something goes wrong, the unit displays a fault code. Do not look up what that code means on a generic list. Codes are brand, model and year specific, and the same characters mean different things across product families. Read the exact code off the display, then check it against the manual for your unit or the label inside the cabinet. The categories are broad and familiar to a technician: ignition failure, flame sensing, air pressure or venting obstruction, overheat and limit, flow and temperature sensing, and gas valve or control faults. Which category you are in tells the technician where to start, and that is the information worth passing along on the phone.

For large homes with genuinely high simultaneous demand, two units piped together and staged by a controller often beat one very large unit. You get redundancy, better part-load behaviour, and the ability to service one while the other runs. It also means a bigger gas load, so it circles right back to the meter capacity question.

Never bypass a safety lockout. If a CO alarm sounds, leave the home and call from outside.

Permits, paperwork, and how to compare quotes honestly

Gas work and venting changes in British Columbia are permitted work. The gas permit is issued through Technical Safety BC or, in some municipalities, through the local authority, and plumbing or electrical portions typically carry their own permits through your city. A quote that quietly omits permits is not cheaper. It is incomplete, and it becomes your problem at resale or at an insurance claim.

Warranty registration is worth doing the week of installation. Manufacturer warranty terms differ by model and sometimes depend on registration and on professional installation, so read the terms that came with your unit rather than relying on a general statement about coverage. Keep the invoice, the permit number and the model and serial numbers together somewhere you will find them in eight years.

If a CleanBC or FortisBC program is part of your decision, confirm eligibility and paperwork requirements directly with the program before the work begins. Program rules, qualifying equipment lists and documentation change, and pre-approval requirements are easy to miss.

When you compare quotes, compare scope, not just the bottom line. Does each quote include gas line upsizing or assume the existing line is fine? New venting or reuse? Isolation valves? Condensate neutralizer and pump? Permits? Removal and disposal of the old tank? Two quotes that look far apart are usually two different projects.

HeatLand has been doing this in Metro Vancouver and the Fraser Valley since 1999. Call (604) 330-3812 for a free written no-obligation estimate that lists the scope line by line. Financing is available.

Quick Checklist

• Write down your real worst-case simultaneous hot water draw, including any soaker tub, before looking at any model.
• Size using winter temperature rise, not the headline flow figure on the marketing page.
• Confirm the required capacity, gas input and venting for your exact model number on the current Bosch spec sheet.
• Have the gas meter capacity, pipe size and developed length checked before choosing between condensing and non-condensing.
• Identify a legal vent termination point that clears windows, doors, air intakes, the gas meter and the property line.
• Decide the condensate route now: gravity to a drain, or a pump with an overflow safety switch and a neutralizer.
• Settle recirculation before model selection if wait time at the far bathroom matters to you.
• If you are in a strata, get written approval for any new or relocated wall penetration before ordering equipment.
• Specify isolation and service valves at installation so future flushes are simple.
• Compare quotes on scope: gas upsizing, venting, permits, valves, condensate handling, old tank removal.

Frequently Asked Questions

Reviewed by the HeatLand Heating & Cooling team — licensed, insured, TSBC-certified HVAC contractor serving Metro Vancouver & the Fraser Valley since 1999. Error codes, specifications, pricing and rebate programs vary by model and change over time; confirm details against your unit’s own manual, a written quote, and the manufacturer or CleanBC/FortisBC. If you smell gas or your CO alarm sounds, leave the home and call the gas utility and a licensed technician from outside.