Whether it is a domestic installation or a large-scale plant, the average service life of geothermal systems is very long. The exact numbers vary somewhat: heat pumps generally last 15 to 20 years, while the benchmark lifecycle for larger power systems is 30 years. In reality, however, many systems last over 60 years, while plants that were built more recently can function up to 80-100 years. This extraordinary longevity is due both to the experience accrued with these technologies and to the lack of combustion, which eliminates the risk of fires. Geothermal systems require relatively little maintenance, and the less lasting components can usually be replaced when they reach the end of their life.