Yes, even new on-demand water heaters need regular maintenance.

The new on-demand, direct-vent propane and natural gas boilers and hot water heaters are known for their minimal maintenance needs. However, minimal maintenance does not mean no maintenance at all. These units still require annual inspections to ensure they remain safe, efficient, and functioning as expected.

Many people are unaware that minerals in the water, commonly known as "hard water," can cause significant scaling inside water heaters, greatly reducing their efficiency. Hard water is characterized by high levels of dissolved minerals, primarily calcium and magnesium, which originate from natural sources like limestone. The concentration of these minerals can vary depending on geographical location and the water supply source.

When water is heated in the water heater, these dissolved minerals tend to precipitate out and form solid deposits, known as scale. This occurs because hot water cannot hold as much dissolved mineral content as cold water. Over time, these deposits accumulate on the heating elements and the inner surfaces of the tank.

The presence of scale can negatively impact a water heater's performance. It acts as an insulating layer on the heating elements, requiring more energy to heat the water to the desired temperature. This inefficiency leads to higher energy bills and can also strain the heating system, potentially causing premature wear and tear.

Additionally, scale buildup can reduce water flow and pressure, as the deposits can block the pathways through which water circulates. This can result in slower heating times and an inconsistent hot water supply, which is particularly inconvenient for households relying on hot water for daily activities such as bathing, cooking, and cleaning.

Beyond these practical issues, scaling can also lead to more severe problems like leaks or even complete failure of the water heater if not properly addressed.

In summary, performing regular maintenance such as descaling and flushing the water heater can help avoid these problems, extend the appliance's lifespan, and ensure efficient operation, so be sure to schedule these tasks for your home.