HEAT EXCHANGERS
NAVIEN UK TECHNICAL DIRECTOR SEAN KELEHER EXPLORES THE ESSENTIAL ROLE OF THE HEAT EXCHANGER IN BOILERS, AND HIGHLIGHTS THE BENEFITS OF SWAPPING ALUMINIUM FOR STAINLESS STEEL…
Stainless- steel heat
The heat exchanger is a core component of the boiler. Acting as the ‘beating heart’, other components are often reliant on its performance as it is responsible for ensuring the effective transfer of heat from the combustion process to the water that heats a home. The most popular material for heat exchangers, aluminium, is particularly vulnerable to pitting and corrosion when exposed to high moisture and varying pH levels, which can ultimately lead to significant maintenance issues and eventual failure. Poor maintenance, such as infrequent cleaning or neglecting leaks, can also lead to premature failure. Operational issues, such as fluctuating water temperatures and pressure imbalances, may accelerate wear and tear, potentially resulting in heat exchanger breakdowns. ALUMINIUM: THE INDUSTRY STANDARD Aluminium is commonly used for heat exchangers thanks to its lightweight nature and excellent heat conduction; however, it can face significant challenges. Its susceptibility to corrosion and scale build-up from mineral deposits when exposed to water and impurities, may lead to rapid material decay and potential leaks, while also reducing efficiency. It can also struggle with fluctuating water temperatures and pressure imbalances, causing thermal cycling and stress which can result in cracking or warping. These weaknesses can lead to accelerated decay, resulting in more frequent replacements and higher maintenance costs. Over time, such issues can compromise the boiler system’s efficiency and reliability, impacting both the exchangers: What are the benefits?
Heat exchanger in Navien’s NCB300 and NCB500 ON.
Heat exchanger in Navien’s NCB700 ON.
INSTALLER AND HOMEOWNER BENEFITS The choice of materials significantly impacts the durability and performance of heat exchangers. For instance, stainless- steel heat exchangers are less likely to develop faults such as gas leaks or pressure build-up, helping to improve safety in the home. This improved durability leads to a more reliable heating system with fewer premature failures, enhancing the installer’s reputation for quality work. Homeowners can also benefit from stainless-steel heat exchangers, as they provide a longer-lasting system with consistent heating performance. The efficiency of stainless steel can lead to potential savings on energy bills because it handles temperature fluctuations more effectively than industry-standard material choices such as aluminium, meaning that homeowners can enjoy a more cost-effective heating system, increased comfort and cost savings over time. Navien emphasises the benefits of high- grade materials in its approach to boiler design. By incorporating stainless steel as a standard for its heat exchangers, Navien ensures that its boilers provide superior durability and efficiency. This commitment to quality addresses common challenges faced by both installers and homeowners, contributing to enhanced performance and satisfaction. To discover the full range of boilers
installer’s workload and the homeowner’s comfort.
WHY STAINLESS STEEL STANDS OUT Stainless steel is a superior alternative due to its enhanced durability and resistance to these issues. Its chromium forms a protective oxide layer with excellent corrosion resistance, while its smoother surface is less prone to scaling. Offering superior thermal stability and pressure resistance, stainless steel manages fluctuating temperatures and pressure changes more effectively. This robustness ensures a longer lifespan and more reliable heat exchanger performance, ultimately reducing maintenance needs and replacement costs and providing a more dependable solution for both installers and homeowners. Stainless steel’s durability ensures that the heat exchanger maintains its performance and structural integrity over a longer period compared to aluminium. This longevity translates into a more reliable and cost-effective heating solution for the homeowner. The smooth surface of stainless steel minimises scale and sediment build-up, which can lead to clogs and reduced efficiency in heat exchangers. By reducing these deposits, stainless-steel heat exchangers ensure not only optimal heat transfer but also contribute to the boiler’s overall environmental sustainability by optimising fuel usage and reducing emissions.
available from Navien UK, visit www.navien.co.uk/professional
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