The HYDRINOX water heater containers are manufactured with a stainless steel storage tank that meets the most stringent hygiene and sanitation requirements. The inner surface of the Hydrinox water heater is formed with a natural patina that protects it from corrosion, even in systems with extremely corrosive water.
There is a 10 year warranty on the stainless steel container and 2 years on the sheathed heating elements.