Heat pumps with district heating for the UK's domestic heating: individual versus district level

The UK has set ambitious targets to reduce carbon emissions, improve energy efficiency and affordability, encourage renewable energy generation, and reduce dependency on imported fossil fuels. Heating is the most essential component of the UK's current residential energy consumption, and it is mostly supplied through the direct burning of natural gas. With constantly changing market conditions and political regulatory frameworks, technology assessments and cost-effective planning strategies are critical for long-term energy and environmental policy designing. Electric heat pumps with decarbonised electricity are proposed as promising technologies that could replace gas heating and contribute to the UK's future low-carbon heat mix. District heating has been transforming over generations in order to better utilise renewables or resources that otherwise would be wasted. Both technologies have been well developed, with abundant scientific research and industrial experiences in some European countries over the past few decades. However, the market shares of heat pumps and district heating networks are low in the UK. This paper explores empirical heat consumption from smart meter data in different types of dwellings in the UK and the role of heat pumps and district heating for different types of dwellings on different scales. This study investigates heat pumps in individual households versus district heating networks through a levelised cost model, to present their comparative environmental and economic advantages. This study shows that economies of scale arise in the UK's district heating networks with large heat pumps, but the costs of heat are significantly higher than individual gas boilers. (C) 2018 The Authors. Published by Elsevier Ltd.