Tankless vs. Tank Water Heater: Which Is Right for Calgary?

Short answer: Neither is automatically better. A tankless heater gives you hot water that does not run out, takes less space and usually lasts longer. A conventional tank costs less up front, is simpler to install and is perfectly good for most homes. Choose tankless if you run out of hot water or plan to stay a long time. Choose a tank if budget and simplicity matter most.

Which one suits your Calgary home comes down to how your household uses hot water, what your gas line and venting can handle, and what you want to spend.

Side by side

	Tankless	Tank
Hot water supply	On demand, does not run out	Runs out after a few back-to-back showers, then reheats
Up-front cost	Higher to buy and install	Lower
Installation	Often needs a larger gas line and new venting	Usually a straight swap
Space	Wall-mounted, frees up floor space	Takes a corner of the mechanical room
Energy use	No standby loss from keeping a tank hot	Some energy lost keeping the tank hot all day
Lifespan	Typically longer than a tank	Around ten to twelve years
Maintenance	Needs regular descaling in Calgary's hard water	Benefits from flushing to clear sediment

When is tankless the better choice?

• You run out of hot water now, or the house is filling up with teenagers or guests
• You are finishing a basement and adding a bathroom
• You plan to stay long enough for the longer life to pay back the higher cost
• You want the floor space back in the mechanical room

When is a tank the better choice?

• The current tank has done its job and you just want a reliable replacement
• Budget matters more than endless hot water
• The gas line or venting would need major work for a tankless unit
• You might sell in the next few years

What Calgary conditions change the answer?

• Cold incoming water. In winter the water coming into the house is colder, so a tankless unit has to work harder to heat it. It needs to be sized for a January morning, not a July one, or the flow disappoints when several taps run at once.
• Hard water. Calgary's minerals scale up the heat exchanger in a tankless unit and settle as sediment in a tank. A tankless unit needs descaling on a schedule, and a softener helps either type. More in our hard water guide.
• Gas supply. Tankless units burn a lot of gas while they run. The gas line has to be sized for it, which a certified gasfitter checks before you buy.

What to ask before you buy

1. How many fixtures do we run at once, at peak?
2. Can our gas line and venting handle a tankless unit, and what would need to change?
3. What maintenance does each option need, and how often?
4. Is our current tank actually done? Here is how to tell.

We install both, and we will walk you through which one suits your household before you spend the money rather than after.

Common questions

Do tankless water heaters work in Calgary winters?

Yes, when they are sized for the colder incoming water. An undersized unit is what gives tankless a bad name.

Is a tankless water heater worth it?

It is worth it if you run out of hot water now or plan to stay long enough for the longer life to pay back the higher installed cost. For many homes, a good tank is the better value.

Can I switch from a tank to tankless?

Usually. The gas line, venting and a spot on the wall are what decide how much work it takes.

Related guides

• Water heater repair or replace?
• Does a plumber do furnaces and heating in Calgary?