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For a typical domestic home, the following represent the typical payback on energy-saving investments.

Home Improvement

Typical Payback (years)

Average Cost (£)

Insulating hot water cylinder (160mm)

0.5

14

Cavity wall insulation

2.6

342

Loft insulation

2.7

284

Heating controls

3.4

147

Draught-proofing

4.3

100

Micro combined heat power (CHP)

6.8

1,571

Solid wall insulation

7.5

3,150

A-rated boiler

8.9

1,500

Micro wind power

10.5

2,363

Ground source heat pump

12.8

4,725

Photovoltaic (solar electricity)

46.4

9,844

Solar water heating

54.7

2,625

Double glazing

97.6

4,000

Source: The First Draft Illustrative Mix of Mesures for EEC 2008-11 (Defra), 2006 and Buildings Research Establishment (BRE), 205. For a more detailed view, download pdf Domestic Efficiency Measures.

Follow the link for further advice on the energy-saving investment options outlined above.