A Giant gas water heater generally fits a townhouse mechanical closet without much trouble, since storage tanks are a compact and familiar shape, but the closet is often shared with a furnace or boiler, which leaves limited room to work with.
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A Giant gas water heater generally fits a townhouse mechanical closet without much trouble, since storage tanks are a compact and familiar shape, but the closet is often shared with a furnace or boiler, which leaves limited room to work with. Power-vent models tend to suit townhouses well because the vent can be routed through a short exterior wall run rather than needing a full vertical chimney path.
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Most townhouse mechanical closets hold more than just the water heater — a furnace or boiler, sometimes a stacked washer and dryer, all share the same small footprint. That means the water heater's placement, and especially its vent routing, has to work around what else occupies the space rather than assuming a clear wall is available.
It's worth walking the closet with your installer before assuming any particular tank will fit — measuring not just the floor footprint but the height needed above the tank for the vent connector and any service clearance the manufacturer specifies for the model being considered.
An atmospheric, naturally drafting tank generally needs a relatively direct vertical path to the outside, which a townhouse closet doesn't always offer. A power-vent model's fan-assisted exhaust can run horizontally through a shorter exterior wall penetration instead, which fits the layout of a lot of townhouse mechanical rooms better than trying to force a vertical vent through multiple floors.
Whatever venting approach is used, the termination point on the exterior wall still needs to clear windows, doors, and any air intakes belonging to your unit or a neighbouring one. Townhouse exteriors often have less available clear wall space than a detached home, so this gets checked specifically during the site visit rather than assumed to work like a standard installation.
If the closet also houses an atmospheric-venting furnace or boiler, combustion air supply for both appliances needs to be adequate together, not assessed separately as if only one appliance were present. This is a detail worth having a licensed gas fitter verify, particularly in an older townhouse where the closet's air supply openings may have been sized for different equipment originally.
A tight closet that's hard to get into complicates not just installation but every future service visit and eventual replacement. Leaving reasonable clearance around the tank for anode rod replacement and general servicing is worth prioritizing even in a space-constrained townhouse, rather than packing equipment in as tightly as physically possible.
This matters even more in a townhouse than a detached home, since a future replacement will face the same access constraints as the original installation, and a tank wedged in without clearance can turn a routine swap into a much more time-consuming job.
Safety note
If you smell gas near the water heater, hear a hissing sound, or see the burner producing yellow or orange flame instead of blue, leave the home right away and call from outside. Don't operate switches, light anything, or use a phone indoors. Call FortisBC at 1-800-663-9911 to report the gas emergency, and have a Technical Safety BC licensed gas fitter inspect the unit before it's put back into service.
Often yes, since its fan-assisted exhaust can route through a short horizontal wall penetration rather than needing a clear vertical vent path, which townhouse closets don't always have.
Yes, that's common, but combustion air supply for both appliances together needs to be adequate, which a licensed gas fitter should verify.
Termination is placed to clear neighbouring windows, doors, and intakes by code-required distances, checked during the site assessment.
It's worth planning for reasonable clearance around the tank during installation so future anode rod replacement and servicing aren't unnecessarily difficult.
It depends on the specific closet's air supply openings, which should be checked against current requirements, especially if the closet's contents have changed over the years.
Cost depends on tank size, venting type, and closet access, and is best confirmed with a short in-person assessment.
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