A plumber is installing a water heater in a commercial building. The building's potable water supply is known to have high levels of sediment and particulate matter. Which type of water heater would generally be most susceptible to efficiency loss and damage from these conditions, requiring more frequent maintenance?
- ATank-type gas water heater
- BIndirect water heater
- CTank-type electric water heater
- DTankless (on-demand) water heater
Show answer & explanationAnswer & explanation
Correct answer: D. Tankless (on-demand) water heater
Tankless water heaters, due to their intricate heat exchange coils with small passages, are highly susceptible to sediment buildup. This buildup can significantly reduce heating efficiency, restrict water flow, and lead to premature failure of the unit. Tank-type heaters have larger tanks where sediment can accumulate, but it typically settles at the bottom and affects efficiency less directly than in tankless units, though regular flushing is still necessary.
Why the other options are wrong
- A. Similar to electric tank heaters, sediment settles in the tank and can affect gas burner efficiency over time, but the heat exchanger is less prone to immediate clogging than a tankless unit.
- B. Indirect water heaters use a separate heat source and are generally less susceptible to direct sediment issues from the potable water supply, as the heat exchanger typically only contains the boiler water.
- C. While sediment can accumulate in electric tank heaters, it primarily settles at the bottom and affects heating elements less directly than in tankless units.
Water Heater Sediment Susceptibility
Different types of water heaters have varying degrees of vulnerability to sediment and particulate matter in the water supply, primarily affecting their efficiency and lifespan.
- Sediment can accumulate in any water heater, but its impact varies.
- Tankless heaters are most sensitive due to small internal passages.
- Regular flushing and filtration can mitigate sediment issues.
Memory trick: Tankless Tangles with Tiny Tubes, Trapping Troubles.