Plumbing notes · when replacing a heater

Weighing a storage tank against an on-demand heater

When the old heater gives out, many households wonder whether to replace it in kind or go on-demand. Both serve well in the right house. The choice turns on how many fixtures run together, the gas supply on hand, where a vent could exit, the floor space, and how much upkeep you are willing to schedule.

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A sauna heater filled with stones — From the almanac guide on tank or tankless.

A storage tank’s strengths

Simpler install that usually reuses the existing vent and gas line
Feeds several fixtures at once up to its stored volume
More forgiving of hard-water scale
Lower upfront outlay in most houses

An on-demand unit’s strengths

Hot water that keeps coming through back-to-back showers
Hangs on a wall, freeing basement floor
No standby losses from a stored tank
A long service life when descaled on schedule

Questions worth answering first

How many bathrooms run at once on a weekday morning? Is the gas line large enough for a big burner? Can a vent leave through an outside wall with proper clearances? Is there a drain nearby for condensate? Will anyone actually flush the unit every year or two?

Hardness and upkeep

Halton’s water is moderately hard. On-demand heat exchangers gather scale faster than tanks do, so isolation valves and a periodic flush belong in any sensible install.

One more thing

Lastly, think about how long you plan to stay. A tank is the cheaper short-term choice; an on-demand unit tends to suit owners staying many years and willing to keep up with its maintenance.