Daikin hybrid heat pump (CP759)

OTHER PARTNERS Newcastle City Council, Daikin
Project summary

The project will evaluate the performance of Daikin Altherma hybrid heat pumps in 12 terraced houses in Newcastle owned by social landlord the Home Group.  Out of these, 6 properties will have completely new central heating systems, while for 6 properties, the existing radiator systems will be used along with the new hybrid heat pump.  The Daikin Altherma hybrid heat pump is an air source heat pump (ASHP) combined with a condensing gas boiler. It is the first of its kind on the UK market and is a development that makes optimum use of each technology.   In milder conditions, the ASHP operates on its own, while in very cold conditions the gas boiler operates on its own as the ASHP is less efficient with cold external temperatures.  For temperatures in between, the system uses the optimum combination of both the ASHP and the gas boiler.  Initial testing from the manufacturer suggests the system is up to 35% cheaper to operate than a new condensing gas combi boiler.

The social housing provider will project manage the installations while NEA will design the monitoring system.  The project aims to reduce the space heating costs of households and evaluate the performance of the new hybrid heat pump technology using detailed monitoring and robust evaluation.

Evaluation Methodology

Interviews will be conducted with a sample of households to collect patterns of behaviour and previous energy expenditure, as well as thermal comfort and experiences of their old heating systems.  Thermal loggers will monitor the temperature in the living room and main bedroom.  The performance of the hybrid heat pump will be monitored by logging the electricity input to the heat pump and the gas consumption by the boiler as well as connecting heat meters to the outputs of the heat pump and the combi gas boiler.  Monitoring will continue for about 12 months after installation of the heat pump.

Project Outcomes

  • NEA is interested in learning more about the performance of the new hybrid heat pump technology.
  • The hybrid heat pump will maximise its efficiency by running the air source heat pump in warmer weather and the combi gas boiler when the temperatures are cold.
  • The manufacturer claims the hybrid system is up to 35% more efficient for space heating and up to 15% more efficient for water heating than a conventional new combi gas boiler.
  • The performance of this system will be determined in a sample of social housing properties.
DETAIL OF TECHNOLOGIES BEING USED Daikin Altherma hybrid heat pump – 5kW air source heat pump with 33kW combi gas boiler
Eligible households assisted
NEA grant with gap funding Match Total
12 12


Extended TIF programme, results due summer 2018
Monitoring and evaluation of this programme will continue during the winter of 2017/2018, doing so will enhance the quality of data and enable a comprehensive evaluation to take place.
Published on 09-01-2017
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