Storage Tank or On-Demand Heater?

How each one works

A tank heater keeps a reservoir of hot water standing by, usually 40 to 60 gallons in a family house. When you use it up, you wait while it recovers. A tankless heater warms the water while it passes through, firing a powerful burner on demand. It never runs out, yet its output is capped by the litres per minute it can bring up to temperature.

Side by side

• Upfront cost: tanks cost less to buy and install. Tankless often needs gas line and venting upgrades.
• Hot water supply: tanks run out under heavy use; tankless delivers continuously, up to its flow limit.
• Space: tankless hangs on the wall; a tank takes floor space.
• Efficiency: tankless avoids standby heat loss, which saves energy, especially in smaller households.
• Maintenance: tankless needs regular descaling in hard water, while tanks also benefit from flushing too, but tolerate neglect better.
• Lifespan: tankless units often outlast tanks if maintained.

Vaughan-specific points

Cold winter inlet water. Incoming water in winter is very cold, so a tankless heater must lift the temperature further. Size for winter, not summer.

Hard water. York Region water is fairly hard. Scale builds up in tankless heat exchangers. A softener or a regular descale schedule is essential.

Rental market. Many Vaughan homes rent their tank. Leaving a rental has its own terms; see our rental note.

Who should pick which

A tank suits a household that wants simple, low-cost replacement and does not run out of hot water now. Tankless suits large households that run out, homes short on space, and owners planning to stay many years. Neither is wrong.

See gas water heater replacement and tankless installation for what each job involves.