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Tankless vs Tank Water Heater: Which Is Right for Your Home?
Our take
Tank for low/moderate demand and tight budgets; tankless if you have high simultaneous demand or plan to stay long-term.
Side by side
| Factor | Tank (Storage) Water Heater | Tankless (On-Demand) |
|---|---|---|
| Upfront install (50 USG / mid-tier) | $2,200–$2,800 gas | $4,500–$6,500 condensing gas |
| Annual operating cost (4-person home) | $360–$420 gas | $260–$320 gas |
| Lifespan | 8–12 years (tank corrosion) | 18–22 years |
| Hot water capacity | Tank size limit (50 USG = 1 long shower or 2 short) | Unlimited if sized correctly |
| Recovery time after depletion | 20–40 minutes | Instant (continuous flow) |
| Footprint | Floor space (~2 ft × 2 ft) | Wall-mounted, much smaller |
| Maintenance | Flush yearly (some homes) | Annual descaling required ($150) |
Tank (Storage) Water Heater wins when:
- Empty nesters or 1–2 person household
- Replacing on emergency
- Tight budget right now
- Existing 1/2" gas line and you don't want to upsize it
Tankless (On-Demand) wins when:
- Family of 4+ with multiple bathrooms used at the same time
- You're staying long-term (15+ years)
- You want unlimited hot water
- You're already running a 3/4" gas line for other appliances
The full take
Tankless saves ~$100–$150/year on gas. The math: that's a 17-year simple payback on the $2,000–$3,000 upfront premium. If you're staying long-term, it pays. If you might move in 5 years, it doesn't.
The "tankless never runs out" pitch is true ONLY if it's sized correctly for your household's peak draw. A small 6.5-GPM tankless can't run two showers simultaneously — you'll get lukewarm water at both. We size based on simultaneous-use demand: count fixtures, set a target rise (∆T), choose a unit.
Mississauga has hard water (~150–200 mg/L hardness depending on neighbourhood). Tankless heat exchangers scale up faster here than in soft-water markets. Annual descaling ($150/year) keeps the warranty valid and the unit efficient.
We quote both options on every replacement so you can compare against your specific household demand. (416) 258-2460.
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Mississauga, ON · Greater Toronto Area and up to 2 hours out — London, Kitchener, Barrie, Kingston, Niagara.