Installing a tankless water heater is a smart move to achieve greater energy savings. Many experts say tankless units operate up to 34% more efficiently than standard tank units. This is because tankless models heat water on demand, so there’s no standby heat loss from stored water. Still, several factors can affect your unit’s overall performance, including your home’s water quality.
Mineral Buildup Inside the Heat Exchanger
When your home has hard water, it has a high concentration of dissolved minerals, usually calcium and magnesium. Over time, these minerals settle inside the water heater system. As they accumulate, they form a thick layer of crust that narrows the passages in the heat exchanger, greatly reducing heat transfer and making it harder for the unit to heat water. If the buildup becomes severe, it can restrict water flow and even overheat the heat exchanger, causing it to warp or crack.
Clogs From Sediment in the Inlet Screens and Filters
The water entering the water heater passes through an inlet screen before reaching the heat exchanger. The purpose of the inlet screen is to trap sediment and other debris so it doesn’t damage or clog the unit’s internal components. When the inlet screen becomes clogged, you may notice reduced hot water flow at your fixtures. This is because the clog can restrict the flow of water below the minimum rate needed to activate the burner or heating elements. If the flow drops too low, the unit may not activate, leaving you with cold water instead of hot.
Rust and Corrosion Increase the Risk of Leaks
Water with high acidity or corrosive chemical levels is especially detrimental to the lifespan of a tankless water heater. Over time, rust and corrosion can eat away at the metal, leading to pinhole leaks that cause huge messes and costly water bills. This is why regular maintenance is so important. A plumber can carefully inspect the heat exchanger, fittings, and connections to determine whether rust or corrosion is affecting the unit’s performance.
One of the best ways to reduce the risk of poor water quality affecting your tankless water heater is to install a whole-home water treatment system. There are several types to choose from, with water softeners among the most common. Whole-home systems treat all the water used throughout the house, benefiting not only the water heater but also all your water-using appliances. If you live in Monroe, LA or a surrounding area and need tankless water heater services, make your first call to Gordon AC & Plumbing.
