Heat pump systems typically come with a warranty of two to three years. Workmanship warranties for heat pumps can last for up to 10 years, for example, through Quality Assured National Warranties (QANW). Many manufacturers also offer options for warranty extensions for a fee.
With regular scheduled maintenance, you can expect an air source heat pump to operate for 20 years or more.
Every year, you should check that the air inlet grill and evaporator are free from leaves or other debris. Remove any plants that start to grow near the heat pump. You may also be advised by your installer to check the central heating pressure gauge in your house from time to time.
Ask your installer for written details of any other maintenance checks you should undertake to ensure everything is working properly. Consult with your supplier for exact maintenance requirements before you commit to installing a heat pump.
A professional should service the heat pump every two to three years.