The tank itself is generally manufactured in stainless steel, quality 1.4301. Regarding the element pipes, we can offer a few different stainless steel qualities, such as: 1.4404, 1.4547 and 2.4858 (Incoloy 825). Furthermore, we can offer thermal insulation, cabling, vent valve, thermostat / overheating protection, NTC-Thermistor, cable gland, protection anode, etc.