The material from which the tank is made.
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Carbon steel. A relatively simple and inexpensive type of steel. At the same time, this alloy is strong and reliable, it is resistant to temperature extremes and high pressures. The main disadvantage of carbon steel is that it is inevitably susceptible to corrosion from contact with water. However, for water pressure tanks (see "Type") this moment does not matter, because it is not water that contacts the tank walls, but an elastic balloon. In expansion tanks, in turn, various solutions can be used to protect the inner walls — for example, special coatings. And even without such coatings, the tank rusts rather slowly, its service life is usually calculated at least for years, and little rust is released into the coolant. Therefore, most modern water pressure tanks are equipped with carbon steel tanks (for additional reliability, individual elements in such models can be made of stainless steel).
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Stainless steel. A type of steel that stands out, by the name, with high corrosion resistance: even with constant contact of water with such an alloy, rust does not appear on it. Accordingly, stainless steel tanks are extremely reliable and durable. On the other hand, they are many times more expensive than similar carbon steel containers, and rust resistance is not so critical (see above for more details). Therefore, this option is used rarely and
...mainly in water pressure tanks.
