A short, squat gas water heater fits low-clearance spaces a tall tank never could, while a tall tank generally offers more usable capacity in a normal-height closet.
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Quick answer
Short gas water heaters have a lower profile and wider base, designed to fit under low ceilings, in crawl spaces, or in tight closets where a standard tall tank simply won't fit, while tall gas water heaters have a narrower footprint and taller body, which generally allows more storage capacity for a given floor space in a normal-height mechanical closet. Short tanks typically trade off some capacity for that reduced height, so a household with the same hot water needs may find a short tank recovers or runs out faster if it holds noticeably less water than the tall equivalent would in the same location. The right choice comes down to the physical space available first, then matching capacity to the household's actual usage.
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A gas water heater's physical dimensions are constrained by where it needs to fit, and in many Metro Vancouver homes that space was determined decades ago when the home was built, long before the current household's hot water needs existed. Basement crawl spaces, low-clearance mechanical closets under stairs, and older laundry rooms with low ceilings often simply cannot accommodate a standard tall tank, which is where a short, wide-body unit becomes the only practical option regardless of any performance trade-off.
Where ceiling height isn't a constraint, a tall tank generally makes better use of a small footprint, since it can hold more water in the same floor space by extending upward rather than outward, which matters in a tight utility closet where floor area is the limiting factor rather than height.
| Factor | Short tank | Tall tank |
|---|---|---|
| Typical use case | Low-clearance crawl spaces, under-stair closets | Standard-height mechanical or laundry closets |
| Footprint | Wider base, lower height | Narrower base, taller height |
| Capacity for given floor space | Generally less | Generally more |
| Venting height clearance needed | Lower | Higher |
| Installation flexibility | Fits where tall tanks can't | Needs adequate ceiling height |
When a short tank is the only option due to space, a technician still needs to confirm the household's hot water demand can reasonably be met, since a short tank in a busy household with multiple bathrooms and a laundry room running simultaneously may recover more slowly than the family is used to. In some of these tight-clearance situations, a tankless water heater is worth considering instead, since it removes the storage-capacity question entirely by heating water on demand, though it comes with its own venting and gas line requirements that need separate assessment.
For a household without unusually heavy simultaneous hot water demand, a properly sized short tank performs perfectly well, and the height trade-off is mostly about total litres held rather than a fundamental difference in how the water is heated.
Cost for a gas storage tank depends on tank size, venting type, and access difficulty, and is best quoted after a short in-person assessment rather than estimated generically, since a tight crawl space installation can add labour time compared to a straightforward closet swap. A technician assessing a low-clearance space will also flag whether the existing venting and gas connection can be reused or need modification to fit whichever tank profile ultimately gets installed.
Safety note
This comparison involves gas-fired water heating equipment, venting, and combustion. Any gas line work, venting change, or connection to a gas appliance must be done by a Technical Safety BC licensed gas fitter. If you ever smell gas or suspect a carbon monoxide problem, leave the home immediately and call FortisBC at 1-800-663-9911 from a safe location before doing anything else.
Usually yes, since a short tank generally fits anywhere a tall one does, though the venting connection height may need adjusting, which a technician can confirm during the swap.
They can, if the reduced capacity doesn't match the household's usage pattern, which is why sizing for actual demand matters more than simply matching the old tank's dimensions.
Not inherently, though very tight crawl space locations can add labour time regardless of tank height, simply due to limited working room for the technician.
Low clearance between the floor and the joists above physically limits tank height, and a short, wide-body tank is designed specifically to work within that kind of restricted vertical space.
It's worth discussing with a technician, especially if the space constraint is severe or the household's hot water demand exceeds what a short tank can comfortably support.
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