Metal pipes are good in that they are more thermal, although due to the same they waste their warmth, but with the competent use of this property, you can do without cast -iron radiators at all. The fasteners of metal pipes are more complicated, but at the same time more reliable than plastic ones, they are more resistant to external damage and, if desired, can be dismantled without trimming and damage them. Metal pipes begin to rust over time, and the internal circuit is intensively clogged, the metal enters with the water into a chemical reaction and quickly oxidizes. This significantly reduces their service life, metal pipes must be changed every 20 -25 years.
