A carriage house above a Delta garage brings one issue a laneway house at grade rarely has: keeping an unheated garage space from freezing the pipes.
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Quick answer
A carriage house in Delta, built above a detached garage, is best served by a compact gas tankless or small tank water heater mounted where it will not be exposed to an unheated garage's winter temperature swings, with a short direct-vent run through the nearest exterior wall of the upper living space rather than through the garage below.
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A carriage house sits above a detached garage, a layout seen on some of the larger, older lots in Ladner and North Delta where a garage was substantial enough to support a second floor. Unlike a laneway house built at grade, the water heater here almost always needs to be located within the heated upper living space, not in the garage itself, because an unheated garage in a Delta cold snap can drop well below freezing overnight even though the coast rarely sees deep prolonged cold.
Any water line running down through the garage to reach a garage-level water heater would be exposed to that same freeze risk, so keeping the appliance and its piping entirely within the heated space above is the more reliable approach.
A carriage house's living space is compact, so a tankless gas water heater, mounted on a wall inside a closet, frees up floor space that a standard tank would take. A well-sized small tank is also workable where simplicity is preferred and the unit fits the available closet, but either way the equipment choice should be settled early since it affects the closet dimensions on the plans.
Because the carriage house sits above a garage with limited exterior wall length, the vent termination for the water heater needs to be planned carefully against the nearest usable exterior wall of the upper unit, clear of the garage door opening below and any window on the carriage house itself or a neighbouring structure.
| Situation | Likely path |
|---|---|
| No hot water after a hard freeze, pipes suspected frozen | Have the lines thawed and inspected for cracks before assuming the water heater itself failed |
| Water heater over 12-15 years old, tank showing rust at fittings | Replacement is usually the safer choice, particularly for a hard-to-access carriage house location |
| Tankless unit throwing an intermittent fault | Repair; check the venting and flow sensor before replacing the unit |
Safety note
If you ever smell gas, hear hissing near the meter or an appliance, or a carbon-monoxide alarm sounds, leave the home immediately and call FortisBC at 1-800-663-9911 from outside. Do not try to relight a pilot or reset anything yourself until the line has been checked. Only a Technical Safety BC licensed gas fitter should connect, alter, or commission gas boiler or water heater venting and gas piping; CANRO carries gas licence LGA0043870 and boiler licence LBP0046450.
It is generally better placed within the heated upper living space, since an unheated garage can freeze overnight during a cold snap and put both the appliance and its piping at risk.
Tankless saves floor space in a compact unit and is a common choice, but a properly sized small tank also works well if the closet dimensions suit it better.
Through the nearest exterior wall of the upper living space, positioned clear of the garage door opening and any nearby windows on the carriage house or neighbouring buildings.
As a ballpark, not a quote, a tankless install commonly runs about $3,500 to $7,500, and a tank replacement is typically less, confirmed after a site visit.
Do not use an open flame to thaw them; shut off the water if a leak is suspected and have a licensed technician inspect the lines and any gas appliance affected.
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