Air to Water Heat Pumps

Air source heat pumps are intended to be the sole source of heating and hot water production for the home.

Air to water heat pumps use the constant energy available in the air with a refrigerant circuit which allows the temperature to be boosted to a useful level for heating or hot water for the home. Given today's concerns about global warming and climate change, a growing number of us are looking to use renewable energy to reduce our carbon footprint and, when it comes to providing domestic heating and hot water solutions which satisfy these demands, air source heat pumps more than measure up. By converting the latent energy that's in the air into heat, these clever devices deliver green, low-cost ,energy-saving heating and hot water all year round.

How Does It Work

Air to water heat pumps operate on a similar principle to an ordinary refrigerator. Heat from the atmosphere is extracted by an outdoor unit and is absorbed by a refrigerant solution which is then compressed to a high temperature. The heat generated is used by the indoor unit to create hot water for a traditional pressurised heating and hot water system. air to water heat pumps can provide an outgoing flow temperature of 65°C. However, they are ideally suited for low-temperature underfloor central heating systems and appropriately sized radiators,as well as for baths and showers, providing a low cost solution throughout the year.

Measured efficiency The efficiency of all heat pumps is measured as Coefficient of Performance (CoP). This is the amount of energy the heat pump produces compared to the amount of electricity needed to run the pump. For example, a heat pump which uses 1kW of electricity to produce 4kW of usable energy has a CoP of 4 and is therefore 400% efficient.

Air to Water features and benefits (Based on Worcester Greensource)

  • Energy efficient – efficiency of up to 400% with a CoP of up to 4
  • Maximum 65°C outgoing temperature – provides hot tap water
  • Works down to outdoor temperatures of -20°C
  • Suitable for use with underfloor heating and appropriately sized radiators
  • Indoor integrated cylinder
  • Easy to install and maintain by a qualified installer
  • Can be installed up to 15 metres from a property
  • No major ground works required
  • Designed for connection to all types of wet heating systems
  • Proven technology that saves you money
  • Comprehensive 5 year* warranty

Help towards installation costs

From time to time the government provides grants for the installation of renewable technology products.

Visit to find out the latest information on available grants.

Microgeneration Certification Scheme

The MCS gives consumers the guarantee that certified microgeneration products and the installers of those products have conformed to a rigorous set of standards.

To qualify for grants such as the Low Carbon Buildings Programme, both the microgeneration product and the installer must carry the MCS mark (solar thermal products can be certified under the Solar Keymark scheme).

Find out more

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