Is it ok to use water softeners with the Noritz NCC199CDV, and how does it affect its performance?

Using a water softener with the Noritz NCC199CDV tankless water heater is generally acceptable and can have several benefits, especially if you have hard water in your area. However, it's essential to understand how water softeners work and their potential impact on the performance and maintenance of the tankless water heater.

How Water Softeners Work:
Water softeners are devices designed to reduce the hardness of water by removing minerals like calcium and magnesium. They typically use a process called ion exchange, where hard water flows through a tank containing resin beads. The resin beads attract and remove the hardness minerals, replacing them with sodium ions. The softened water is then distributed throughout your plumbing system.
Benefits of Using a Water Softener with a Tankless Water Heater:
1. Scale Prevention: One of the primary benefits of using a water softener is the prevention of scale buildup. Hard water can lead to the accumulation of mineral scale inside the heat exchanger of a tankless water heater. This scale acts as an insulating layer, reducing heat transfer efficiency. A water softener can significantly reduce scale formation, helping to maintain the heater's performance and efficiency.
2. Extended Lifespan: By reducing the risk of scale buildup and corrosion within the tankless water heater, a water softener can contribute to the longevity of the unit. Scale accumulation and corrosion are two factors that can lead to premature failure of heating elements and other components.
3. Improved Efficiency: A water softener can help the tankless water heater operate more efficiently. When scale is present, the heater must work harder and longer to provide hot water, leading to increased energy consumption. Softened water allows the unit to operate at its rated efficiency, potentially resulting in energy savings.
Considerations and Potential Impact:
1. Sodium Content: The ion exchange process in water softeners replaces calcium and magnesium ions with sodium ions. While this reduces water hardness, it does introduce sodium into the water. If you are on a sodium-restricted diet or have specific health concerns related to sodium intake, you should consider the potential increase in sodium levels when using a water softener.
2. Maintenance: While water softeners help prevent scale buildup in the tankless water heater, they require maintenance themselves. You'll need to replenish the salt in the softener's tank periodically. Failure to do so can result in less effective softening and potential scaling issues.
3. Water Quality: Softened water may feel different to some people, as it can be "slippery" compared to hard water. The perception of water quality is a personal preference, and some individuals may prefer the taste and feel of hard water.
4. Plumbing System: Water softeners treat all the water entering your home, including cold water. This can affect not only the tankless water heater but also other appliances and fixtures. It's essential to consider how a water softener may impact your entire plumbing system.

Installation Considerations:

When installing a water softener with a tankless water heater like the Noritz NCC199CDV, ensure that it is correctly sized and installed. It's also crucial to consult with a qualified plumber or technician experienced in tankless water heater installations. They can help you determine the ideal location for the softener, any necessary adjustments to the plumbing system, and proper maintenance procedures.

In summary, using a water softener with the Noritz NCC199CDV tankless water heater is generally acceptable and can provide several benefits, including scale prevention, extended lifespan, and improved efficiency. However, it's essential to consider factors like sodium content, maintenance requirements, water quality preferences, and the impact on your entire plumbing system. Proper installation and maintenance of both the water softener and the tankless water heater are key to ensuring they work together effectively to provide you with reliable hot water while protecting your investment in the water heater.