|W||Watt||Unit of Power|
|kWh||Kilowatt hour||Measure of Energy|
|L||Litre||Measure of Volume|
|Measures to reduce fuel bills||ROI*|
|Cavity Wall Insulation||2.2|
|Solid Wall Insulation||15.1|
|Solar Hot Water||34|
*ROI is the time it takes in years to return the investment in fuel savings for an average gas heated 3 bed semi-detached house. The table assumes no government incentive schemes are used.
|Renewable Energy Measures||ROI**|
- Replacing Electric
|4 to 8|
- Replacing LPG
|15 to 30|
|Wind Power||14 to 55|
|Solar Photovoltaics||24 to 64|
**ROI is the time it takes in years to return the investment in electricity savings. The table assumes no government incentive schemes are used.