How long home equipment lasts

Typical service life by type, from inspector and industry references, with what shortens it and the signs it's time to replace.

• How long does a water heater last?

  Tank water heater (gas or electric): 8 to 12 years. Tankless water heater: 15 to 20 years.

• How long does a furnace last?

  Gas furnace: 15 to 20 years.

• How long does an AC unit last?

  Central air conditioner: 10 to 15 years.

• How long does a heat pump last?

  Heat pump (air-source, ducted): 10 to 15 years. Ductless mini-split heat pump: 15 to 20 years.

• How long does a boiler last?

  Cast-iron (non-condensing) boiler: 20 to 30 years. Condensing (high-efficiency, often wall-hung) boiler: 10 to 15 years.