Stainless steel internal tank, coil and external cover. The tank has a 5-year warranty against leaks. It works with a 750W 220V nickel-plated copper resistance or with a heat exchanger connected to the engine cooling system. The resistance is positioned on the lower part of the boiler to avoid heat stratification. Fitted with dual safety/service thermostat and 7-bar safety valve. Polyurethane foam insulation, horizontal or vertical installation.