How Port Moody duplex owners typically decide between separate water heaters and one shared unit.
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Quick answer
In Port Moody, a duplex with two separate gas meters almost always gets a separate water heater per side, which keeps hot water use and cost fully independent. Where an older duplex still runs off a single meter, one correctly sized water heater can serve both sides, but it must be sized for the combined fixture count of both households, not just one.
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Where each half of a Port Moody duplex has its own gas meter, running a separate water heater for each side is the standard setup, since it matches the way the gas bill and the rest of the utilities are already split. It also means a problem with one unit's water heater has zero effect on the other household.
This is the more common arrangement in duplexes built or converted more recently, where separate metering was set up from the start.
On an older, single-meter duplex still sharing one water heater, sizing has to account for both households' combined fixture count and the likelihood that both sides shower, run laundry, or wash dishes around similar times. Treating a shared unit as if it only needs to serve one household is a common cause of complaints about hot water running short.
| Setup | Sizing Approach | Outcome |
|---|---|---|
| Two meters, two units | Each sized to its own side | Independent supply for each household |
| One meter, shared unit | Sized for combined demand and overlap | Needs a larger tank or tankless capacity |
| One side upgraded only | New unit sized to that side | Other side's older unit still needs review |
Where both halves of the duplex vent from the same exterior wall, clearance from the neighbouring unit's windows and doors has to be checked for both sides together, not just the unit being replaced. This matters especially on narrower Port Moody duplex lots where the two units sit close together.
Many of Port Moody's duplexes are on infill lots in established neighbourhoods near Moody Centre and along the Barnet corridor, often replacing an older single-family home on a standard-width lot, which can mean tighter side-yard space than a purpose-built duplex development. Water in Port Moody comes from the same soft regional reservoir supply used across Metro Vancouver, so the choice between tank and tankless doesn't need to account for hard-water scale.
Water heater changes on a Port Moody duplex go through the City's mechanical permit process for each unit separately, even on a shared-meter setup, since each dwelling is reviewed on its own.
On separately metered duplexes, the repair-versus-replace decision is the same as for any single-family home -- tank age, visible corrosion, and whether the fault is a serviceable part or a failing tank. On a shared single-meter system, a failure affects both households at once, which often pushes owners toward replacement sooner, especially if the original unit was already undersized.
On a separately metered duplex, an annual check is a per-unit visit -- the technician flushes sediment from each tank, tests the temperature-and-pressure relief valve, and checks the anode rod on each side independently, since the two units can age differently even if they were installed around the same time.
On a shared single-meter system, the same checks apply to the one unit, but the technician also confirms the tank is still keeping up with both households' combined demand as fixtures or occupancy on either side change over time.
Safety note
A gas odour, a scorched smell near the appliance, or soot around a vent hood are all reasons to leave the home and call FortisBC at 1-800-663-9911 before doing anything further. Gas connections, venting, and combustion work are restricted to a Technical Safety BC licensed gas fitter under provincial law.
If the units have separate gas meters, yes -- this is the standard setup and keeps hot water use and cost fully independent for each household.
Yes, on a shared-meter duplex, but it needs to be sized for the combined fixture count and realistic overlap in use between both households.
It can. Vent clearance from the neighbouring unit's windows and doors is checked for both sides together when they vent from the same exterior wall.
Yes, the City of Port Moody reviews mechanical work for each dwelling unit on its own, even where the two sides share a single gas meter.
As a ballpark, not a quote, a tankless install runs $3,500 to $7,500 per unit; a shared unit sized for two households may cost more depending on required capacity.
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