Their scope is give the chance to transport heat by water, with fast starting, high thermal efficiency, limited dimensions and weight. They heat the water very fast, in the place and at the time you need saving from the warning and anti-economics thermic accumulations. It provides a fullfill energetical save during the system setting-up phase. They are designed to work in totally exemption from any obbligation by assistance because they are fully automatizated. The water goes into the coil where it catches the combustion products (gasoil, methan, etc..) first along the flow and after against it. Overtheated water heat generators for rating until 3.000.000 Kcal/H and standard pressure up to 12 bar.