An indirect water heater lets your gas boiler handle both heating and hot water, a practical option for Delta homes already running boiler-based systems.
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Quick answer
An indirect water heater is an insulated storage tank that heats domestic hot water using a coil connected to a gas boiler's hot water supply, rather than having its own burner, so a single boiler covers both space heating and domestic hot water. In Delta, this tends to appeal most to homes that already run boiler-based heating, including some older character properties near Ladner and larger newer builds in Tsawwassen, where consolidating combustion equipment into one appliance simplifies the mechanical room.
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An indirect tank doesn't burn gas directly; instead, hot water already produced by the boiler for space heating circulates through an internal coil inside the insulated tank, transferring heat to the domestic water supply without the two water sources mixing. A control system gives priority to domestic hot water calls, so when someone turns on a tap, the boiler responds to that demand promptly even if the space heating system is also actively calling for heat at the same time.
Some older character homes near Ladner's historic village run boiler-based radiant or hydronic heating, and for these properties, an indirect tank means domestic hot water doesn't require its own separate gas connection and venting, which can be a meaningful simplification in a home where mechanical access, sometimes via a crawl space, is already limited. Newer, larger Tsawwassen homes with boiler-based heating see a similar benefit, particularly where multiple bathrooms in use at once create higher simultaneous hot water demand than a standard gas water heater is built to handle smoothly.
The boiler needs enough capacity to handle the home's heating load and still recover the indirect tank promptly, particularly on a damp, cool Delta winter evening when both space heating and domestic hot water demand can overlap. An undersized boiler is the most common reason an indirect setup underperforms compared to a standalone gas water heater; a licensed technician calculates this based on the specific home's heating load and household hot water patterns rather than a generic assumption.
| Factor | Why it matters |
|---|---|
| Boiler capacity relative to combined heating and hot water load | Undersizing causes slow recovery or reduced heating output at peak demand |
| Tank size relative to household usage | Determines standby capacity for simultaneous fixture use |
| Mechanical room access, including crawl space installations | Affects piping routing and installation complexity in older homes |
| Control priority settings | Balances how the boiler responds to heating calls versus hot water calls |
A new boiler installation, a natural point to add an indirect tank if one isn't already in place, costs more than replacing existing boiler equipment alone, and the indirect tank itself adds to the total depending on its size and the specific piping and control work required — the full figure is confirmed after an in-home assessment, not quoted upfront.
Safety note
Installing an indirect water heater tied to a gas boiler, including any gas connection, venting, or boiler control changes, must be performed by a Technical Safety BC licensed gas fitter. CANRO holds gas licence LGA0043870 and boiler licence LBP0046450. If you ever smell gas near the boiler, leave the home and call FortisBC at 1-800-663-9911.
No, it has no burner and relies entirely on hot water circulated from the boiler, so it doesn't need separate gas venting or a combustion air supply.
Often, yes, since it avoids adding a second combustion appliance's venting run in a space where mechanical access may already be limited.
Recovery will be slower than expected, and overlapping space heating and hot water demand can strain the system, which is why sizing is calculated specifically for the home rather than assumed.
When the boiler is being installed or replaced is typically the most efficient time, since both loads can be sized together from the outset.
Often, yes, particularly households with multiple bathrooms in simultaneous use, since the boiler's overall heating capacity can back up tank recovery better than a standard water heater alone.
A new boiler installation cost varies with system size and scope, with the indirect tank adding to that depending on its size and installation specifics — confirmed after a short assessment, not quoted upfront.
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