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Home Energy Efficiency Database (HEED)

HEED has been developed by the Energy Saving Trust (EST) on behalf of UK Government. The programme was initiated in 2001 in order to register the uptake of sustainable energy measures and related survey data throughout the UK housing stock (HEED, 2015b, HEED, 2015a) . HEED is a large dataset of measures undertaken across the UK housing stock, and includes not only measures implemented under government schemes; such as CERT and ECO, but also data from arrange of sources, including installations of new boilers (CORGI) and also double glazing measures (FENSA), along with a significant amount of survey data. The database includes approximately 14 million properties.

Figure 1 shows a breakdown from the HEED data on loft insulation for England and Wales, the records include data from 14,336,929 from a total of 24,068,543 properties.

Figure 1 HEED data on loft insulation extent in England and Wales  (HEED, 2015b, HEED, 2015a)

Although Figure 1 shows that a third of lofts have a near optimal level of loft insulation of 250mm+, it can be seen how over 50% of properties in England and Wales remain unknown. Given that many of these properties will not have been part of any government insulation scheme, delivery of loft insulation measures will be dependent on unilateral action by owner occupiers or landlords. However this is more likely than more invasive measures such as cavity wall insulation.

Figure 2 shows how although a significant number of cavity walls have been insulated; many fewer solid walls have received insulating measures. Given the remaining high cost and often negative net present values of solid wall measures (EST, 2013) it is likely that very few measures have been delivered outside the schemes covered under the HEED.  27% of the UK stock are classified as solid walls, HEED estimates 9.2% are un-insulated solid walls, with only 1% having insulation installed internally or externally. It is likely that the remaining solid walls, not covered in HEED, that represent approximately are mostly untreated.  However in their Review of Carbon Savings from Residential Efficiency report, the EST estimate solid wall insulation has the biggest mitigation potential of any single retrofit measure at 9.38 Mt CO2 (EST, 2013)..

Figure 2 HEED data on external wall insulation extent in England and Wales  (HEED, 2015b, HEED, 2015a)

Figure 3 illustrates the extent of double glazing measures in England and Wales. Again given that the HEED data includes records from the UK glazing trade and certification body FENSA, the ’known’ data is likely to include the majority of installations. As with external wall insulation, the relative specialism of these measures means they are likely to have been carried out by registered tradespeople.

Figure 3 HEED data on glazing measures t in England and Wales (HEED, 2015b, HEED, 2015a)

As shown by Table 1 HEED data on heating systems in England and Wales, the vast majority of heating systems remain boilers, with a fairly even split between the more efficient new condensing boilers, with typical efficiencies of 90%; and the older non-condensing boilers with efficiencies at around 60%. . It can also be observed that heat pump technology has yet to make a significant impact on the UK heating market.

Table 1 HEED data on heating systems in England and Wales (HEED, 2015b, HEED, 2015a)Non-Condensing Regular Boiler1,886,25913.2%Condensing Regular Boiler1,714,23712.0%Unknown9,249,22964.5%Non-Condensing Combination Boiler512,1183.6%Condensing Combination Boiler49,2910.3%NC – Back Boiler184,0201.3%Electric Storage Heaters208,7691.5%Community Heating5,4370.0%Heat Pump61,4850.4%Warm Air60,2760.4%Room Heaters3410.0%Other405,4672.8%Total:14,336,929100%


EST 2013. Review of potential for carbon savings from residential energy efficiency -Final report. Cambridge: Energy Saving Trust.

HEED 2015a. Homes Energy Efficiency Database – HEED Online 3 – Area Summary Report. Energy Saving Trust.

HEED 2015b. Homes Energy Efficiency Database – HEED Online 3 – Installations Summary. Energy Saving Trust.