What is an air source heat pump system?

An air source heat pump can be a low-carbon form of central heating that moves heat from a natural outdoor element, such as the air, into your home when used in conjunction with renewable energy sources. They can take heat from outside in temperatures as little as -15 degrees and convert it into usable heat, with the help of electricity, to provide you with underfloor heating or hot radiators.

These appliances work by generating heat from the environment using a similar principle to a refrigerator, only in reverse. A fridge works by extracting warmth from the contents of the appliance, therefore reducing the temperature. An air source heat pump instead uses the heat from outside and brings it into your home.

For this process to occur, a fan is used to draw air across a heat exchanger (or evaporator). The heat in this air is transferred to a refrigerant circulating through the evaporator causing it to change from liquid to vapour. A compressor, using electricity, then compresses this vapour causing it to rise in temperature. At this high temperature, the heat is then suitable for transferring to the heating and hot water systems in your home.

Air source heat pumps have an outdoor unit that  is installed outside your home, the size you require will depend on the size of your home, the number of people living there and your heating and hot water demands.

Viessmann Air Source Heat Pumps

A summary of the advantages of an air source heat pump

  • Free heat source available at any time of day
  • Expandable thanks to cascade function
  • Suitable for both new builds and modernisation project
  • Environmentally friendly
  • Relatively low investment costs
  • No official approval required
  • Retrofitting possible

Vitocal 150-A

Air Source Heat Pump

Air source heat pump in monobloc design

Rated heating output: 2.1 to 14.9 kW
High energy efficiency
Sustainable operation
Cooling function

Vitocal 151-A Air source heat pump

Vitocal 151-A

Air Source Heat Pump

Compact air source heat pump in monobloc design

Rated heating output: 2.1 to 14.9 kW
Integral DHW cylinder
High energy efficiency
Sustainable operation

Find out if you are eligible for an SEAI Heat Pump Grant ?

Upgrade your heating system with a Heat Pump and claim a grant of up to €6,500.