Older New Westminster homes bring chimneys, iron piping and tight basement rooms to a combi replacement, and each needs a plan.
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Quick answer
A combi boiler replacement in New Westminster swaps an older gas boiler and usually a separate water heater for one sealed-combustion condensing unit that heats the house and makes hot water on demand. In the city's older homes, the work centres on flushing old iron piping, dealing with the old chimney and venting the new boiler through a wall. CANRO assesses the home, quotes in writing, arranges permits and commissions the boiler with a measured combustion test.
Need a licensed gas fitter for your gas boiler? Call CANRO at (604) 359-1081 — residential natural-gas heating and hot water across Metro Vancouver since 1999.
New Westminster is among the oldest cities in British Columbia, and its houses reflect that. In Queen's Park, the Brow of the Hill, Sapperton and Glenbrook North, many homes date from the early twentieth century, with brick chimneys, cast iron radiators, full basements and mechanical rooms crowded with the equipment of several generations. A combi replacement here is rarely a like-for-like swap.
The old boiler often vents up a masonry chimney. A sealed-combustion combi vents through a small plastic or stainless pipe out a wall, which means finding a suitable exterior wall with the required clearances from windows, doors and the gas meter. On narrow city lots with close neighbours and side yards, that termination location can be the hardest part of the plan, and it is worked out before the quote is written.
Queensborough and newer pockets of the city are different again: newer piping, radiant floors and closets that were built with compact boilers in mind.
Removing an atmospheric boiler that shares a chimney with a water heater or a furnace has consequences for the appliances that stay. A chimney sized for two appliances can behave badly when only one is left, with weak draft and condensation in the flue. If a combi replaces both, the chimney is no longer used for that equipment, and it should be capped or otherwise dealt with properly, since a neglected chimney can let in water and animals. Where another appliance still uses it, the gas fitter checks whether it needs a liner.
Many older homes have a gas water heater beside the boiler. A combi can take over both jobs, and that frees a good amount of floor area in a low-ceilinged basement. It is also why the assessment counts bathrooms and fixtures: the combi has to serve them all.
| Household | A combi tends to suit | Consider a tank-based setup instead |
|---|---|---|
| One or two people, one bathroom | Yes, especially in a tight basement | Only if a large soaker tub is used regularly |
| Family with two bathrooms, staggered showers | Often, with attention to fixture flow | If showers regularly overlap |
| Larger home with several bathrooms in use together | Rarely the best fit | A heat-only boiler with an indirect tank |
| Home with a secondary suite or a laneway house | Depends on combined demand | Often, because two households draw at the same time |
| Heritage home with limited space | Frequently, to free floor area | When the tank can fit and demand is high |
The table is a starting point. We ask about your routine, look at your fixtures and give an honest recommendation.
A compact condensing boiler has narrow water passages, and a hundred years of iron piping is a rich source of rust and black magnetite. A proper flush of the loop and radiators, and a dirt separator with a magnetic filter installed on the boiler piping, are what protect the new boiler. We also check the radiators for leaks at their valves and unions, since the flush and the restored pressure can expose weak points that the old system hid.
Old gravity-conversion piping is often large in diameter and offers low resistance to flow, which affects the circulator choice. The combi's built-in or matched pump is checked against the system, and where the manufacturer's manual calls for hydraulic separation or a dedicated pump, it is added.
As a ballpark, not a quote, boiler replacement commonly runs from $7,500 to $15,000+, depending on the piping, venting, gas supply and complexity of the room, and the CANRO office confirms a firm number in writing after a short assessment. Please confirm current rebate eligibility with the program providers, since those change.
A combi asks for a lot of gas in a short burst when it makes hot water, which is more than many older boilers asked for on their own. In houses whose gas service was sized decades ago, we check the pipe from the meter and the meter itself, and if the load is a problem, we explain what an upgrade would involve and the conversation with FortisBC that may be needed. It is much better to learn this at the assessment than on installation day.
The basement itself needs thought. Low ceilings and stone or old concrete walls make routing a vent and condensate line a real design task. Floor drains may be missing or blocked, so we work out where the condensate can go, and sometimes a small condensate pump is the practical answer. Where old boilers sat on a raised pad, we look at whether the new wall-hung boiler can be mounted on a sound surface at a height that leaves room for service.
Any asbestos-containing material that may be present on old boiler insulation or piping is a matter for the proper specialists, and we stop and advise the homeowner if we suspect it, since older buildings in the city may have it.
Yearly service keeps the combi healthy: condensate trap, vent and intake, hot water heat exchanger, flow sensor, filter cleaning and a combustion test. CANRO Heating & Cooling, a licensed family-run gas contractor in Burnaby serving Metro Vancouver since 1999, holds a gas licence and a boiler licence. We are not a factory dealer for any brand, and we explain the trade-offs so that you can decide with the facts in front of you.
Safety note
Boiler and water heater removal, chimney and venting changes, gas piping and installation must be done by a Technical Safety BC licensed gas fitter under permit. If you smell natural gas, leave the home immediately, avoid switches and flames, and call FortisBC at 1-800-663-9911 from outside. If a carbon monoxide alarm sounds, get everyone out and call 911.
If nothing else vents through it, it should be capped or otherwise made safe. If another appliance uses it, a licensed gas fitter checks whether it needs a liner, because removing one appliance changes how the chimney behaves.
Usually yes. The system is flushed and filtered and the boiler is sized from a heat-loss calculation. Old radiators often work with cooler water than they were designed for.
Out an exterior wall, at a location that meets the manual's and code's clearances. On narrow city lots, that is planned at the assessment so there are no surprises.
Some do, particularly about exterior changes that are visible from the street. We ask early and can help you check with the City.
It depends on the combined hot water demand. Two households drawing water together often favour a heat-only boiler with a tank, and we will tell you plainly if that is the better fit.
It depends on the scope, the piping and the permit steps. We give a realistic plan after the assessment and do not promise a timeline before we have seen the house.
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