Homeowner guideHot water guide
Tank vs Tankless Water Heater: Which Fits?
Tank or tankless is one of the most common questions we hear when a water heater is due. There is no single right answer, but there is a right answer for your house.
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- Short steps a homeowner can follow safely
- What to check before you pick up the phone
- Clear signs it is time to call a plumber
- Markham and York Region notes where they matter
- Licensing details confirmed when you call
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- Markham & York Region
The short version
- Does the hot water give out before everyone has showered?
- How many showers are on at once on a busy morning?
- Do you need the floor space?
- Is your gas meter and line big enough for a tankless unit?
- Are you willing to do or pay for yearly maintenance?
- Are you renting your current tank?
How each works
A tank heater keeps 40 to 75 gallons of water hot and ready. A tankless unit heats water on demand, firing only while a tap runs.
Side by side
| Point | Tank | Tankless |
|---|---|---|
| Upfront cost | Lower | Higher, especially with gas line upgrades |
| How much hot water | Whatever the tank holds | Endless, but capped per minute |
| Space | Floor space | Wall-mounted |
| Lifespan | Often 10 to 15 years | Often 15 to 20 years with care |
| Maintenance | Occasional flushing | Yearly descaling advised |
| Energy use | Some standby loss | No standby loss |
Markham factors
Incoming water is cold in winter, so tankless units must be sized for a large temperature rise. Moderate hardness means scale builds up in heat exchangers. Many homes rent tanks, and ending a rental can involve a buyout. These all affect the decision.
From the van: A tankless unit that is too small will deliver lukewarm water when two showers run at once in January. Size it for winter.
Our approach
We ask how you use hot water, check your gas supply and venting options, and give you honest numbers for both choices. Sometimes a well-sized tank is the better value. Sometimes tankless is a clear win. You decide with the facts in front of you.