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Site Units

The main units used in this site are in the table below, For a complete explanation of any of these Wikipedia is an excellent resource.

Unit Name Detail
W Watt Unit of Power
kW Kilowatt 1000 watts
kWh Kilowatt hour Measure of Energy
L Litre Measure of Volume

Best Investment table

Measures to reduce fuel bills ROI*
Lagging 1
Loft Insulation 1.9
Cavity Wall Insulation 2.2
Underfloor Insulation 4.2
Solid Wall Insulation 15.1
Solar Hot Water 34
Double Glazing 55.6

*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**
Heat Pumps
- Replacing Electric
4 to 8
Heat Pumps
- 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.


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