All our water filter systems are covered with a 3 year, replacement warranty. This warranty covers any defect of the materials used for the manufacturing of the unit. The warranty does not cover any damage or injury done during installation by the purchaser. It is the responsibility of the consumer to regularly check for leaks. The warranty does not cover any damage done because of excessive pressure or hammering. The warranty does not cover the regular replacement of filter cartridges, only covers defective cartridges.