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The "sealed diaphragm expansion tank" prevents energy loss due to evaporation of circulating water, overflow, and other factors. With minimal oxygen contamination from the air, it prevents oxidative corrosion and extends the lifespan of the entire system. The diaphragm inside the tank is made of a special rubber that is highly durable, allowing for long-term use. The expansion tank for hot water and water supply is coated with a special resin in the liquid contact area, making it extremely hygienic and free from corrosion concerns. Additionally, inspection and maintenance in the machinery room are very easy. An internal sealed pressure check and visual inspection once a year or more is sufficient. 【Features】 ○ Energy-saving ○ Long lifespan ○ Easy maintenance ○ Freeze prevention ○ Hygienic For more details about Flamco's "sealed diaphragm expansion tank," please contact us or download the catalog.