The dissolved salts that the water entering the boiler may contain reduce its solubility at high temperatures, and they settle on the walls, affecting the heating of surfaces and the circuit, and the boiler's performance.
The best method for prevention is to treat the water properly before it enters the boiler's circuits, by means of filters, softening or osmosis.
If the water that travels around the circuit is hard, i.e. it contains a large proportion of dissolved minerals, such as carbonates, calcium sulphates, or silicates, or organic matter in suspension, scale will form quickly and this will lead to a decline in performance and breakdowns.
Scale is frankly difficult to remove. It is better to prevent it. It precipitates on the inner surfaces and at the bottom of the boiler, which is why it is advisable to have different control points distributed all around the circuit where automatic purges of salts and sludge can be carried out, as ATTSU boilers have.