Are expansion tanks required on tankless water heaters? This is a common question among homeowners and professionals alike. While tankless water heaters offer numerous advantages, such as energy efficiency and space-saving, the need for an expansion tank is often a topic of debate. In this article, we will explore the reasons behind the necessity of an expansion tank on tankless water heaters and the potential consequences of skipping this essential component.
Expansion tanks are designed to accommodate the expansion of water as it heats up. In traditional water heaters, the expansion tank is typically integrated into the system, as the water is stored in a tank. However, in tankless water heaters, the water is heated on-demand, which raises the question of whether an expansion tank is still required. The answer lies in the nature of the tankless system and the potential risks associated with not having an expansion tank.
One of the primary reasons for installing an expansion tank on a tankless water heater is to protect the system from pressure fluctuations. As water heats up, it expands, and without an expansion tank to absorb this excess pressure, the system may experience damage. This can lead to leaks, burst pipes, or even damage to the tankless water heater itself. An expansion tank acts as a buffer, allowing the system to handle the increased pressure without any issues.
Another important factor to consider is the potential for air pockets in the system. In tankless water heaters, air can become trapped in the pipes and valves, which can cause noise and reduce the efficiency of the system. An expansion tank helps to expel this air, ensuring that the water flows smoothly and quietly through the pipes.
While some tankless water heater manufacturers may claim that their systems do not require an expansion tank, it is essential to research and consult with professionals before making a decision. In some cases, the tankless water heater may be designed to handle the expansion of water without an expansion tank, but this is not always the case. It is crucial to ensure that the system is compatible with an expansion tank and that it is installed correctly to provide the necessary protection.
In conclusion, while the need for an expansion tank on tankless water heaters may not be as apparent as in traditional systems, it is still an essential component. The potential risks of not having an expansion tank, such as pressure fluctuations and air pockets, can lead to costly repairs and system damage. It is advisable to consult with a professional and follow the manufacturer’s recommendations to ensure the longevity and efficiency of your tankless water heater.
