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Oxfordshire detached house - Energy savings breakdown

Features

Greenstar oil fired condensing boiler
Greenskies solar panels

Energy measurements

May 11

Energy provided by boiler: £1
'Free' energy provided by solar: £7.60

Jun 11

Energy provided by boiler: £0
'Free' energy provided by solar: £6.40

Jul 11

Energy provided by boiler: £0
'Free' energy provided by solar: £7.75

Aug 11

Energy provided by boiler: £0
'Free' energy provided by solar: £8.35

Sep 11

Energy provided by boiler: £1
'Free' energy provided by solar: £7.25

Oct 11

Energy provided by boiler: £9
'Free' energy provided by solar: £2.25

Nov 11

Energy provided by boiler: £29
'Free' energy provided by solar: £1.85

Dec 11

Energy provided by boiler: £27
'Free' energy provided by solar: £0.50

Jan 12

Energy provided by boiler: £23
'Free' energy provided by solar: £0.95

Feb 12

Energy provided by boiler: £22
'Free' energy provided by solar: £1.75

Mar 12

Energy provided by boiler: £16
'Free' energy provided by solar: £2.50

Apr 12

Energy provided by boiler: £15
'Free' energy provided by solar: £1.90

Key

Grey block: 'Free' energy provided by solar
Green block: Energy provided by boiler

This graph represents the property's energy usage.

We have measured the condensing boiler oil consumption and the solar panel energy contribution then calculated the cost to run the boiler and the equivalent cost saving from the solar.

Figures based on the energy supplier charging a rate of 4.5p/kWh

Annual savings Savings are calculated by comparing the cost of energy to run a G rated oil boiler to the cost to run an A rated condensing oil boiler plus free energy from the solar panels. The carbon emissions of the boilers are directly related to their efficiency and the amount of energy each appliance uses. Figures based on the energy supplier charging a rate of 4.5p/kWh	Fuel saving	Carbon emissions
Calculated over last 12 months G-rated boiler £251 A-rated boiler and solar panels £143 Energy provided by solar £0 43% saving	Calculated over last 12 months G-rated boiler 1369 Kg of CO₂ A-rated boiler 780 Kg of CO₂ 43% reduction

Annual savings

Savings are calculated by comparing the cost of energy to run a G rated oil boiler to the cost to run an A rated condensing oil boiler plus free energy from the solar panels.

The carbon emissions of the boilers are directly related to their efficiency and the amount of energy each appliance uses.

Figures based on the energy supplier charging a rate of 4.5p/kWh

Fuel saving

Carbon emissions

Calculated over last 12 months

G-rated boiler: £251
A-rated boiler and solar panels: £143
Energy provided by solar: £0; 43% saving

Calculated over last 12 months

G-rated boiler: 1369 Kg of CO₂
A-rated boiler: 780 Kg of CO₂; 43% reduction

Free baths and showers The free baths and showers savings are calculated from the energy savings between a G rated oil boiler and A rated condensing oil boiler plus free energy from the solar panels.	Total free showers in 2009	Total free baths in 2009
1305	397

Free baths and showers

The free baths and showers savings are calculated from the energy savings between a G rated oil boiler and A rated condensing oil boiler plus free energy from the solar panels.

Total free showers in 2009

Total free baths in 2009

1305

397

SAP ratings The energy efficiency rating is a measure of the overall efficiency of a home. The higher the rating ('A' being the highest) the more energy efficient the home is and the lower the fuel bills are likely to be. The environmental impact rating is a measure of a home's impact on the environment in terms of carbon dioxide (CO2) emissions. The higher the rating ('A' being the highest) the less impact it has on the environment.	SAP energy efficiency rating	SAP environmental impact rating
Before improvements Efficiency grading F Efficiency rating band (21-38) Efficiency rating 25 After improvements Efficiency grading F Efficiency rating band (21-38) Efficiency rating 32 More on Energy Performance Certificates	Before improvements Efficiency grading F Efficiency rating band (21-38) Efficiency rating 23 After improvements Efficiency grading F Efficiency rating band (21-38) Efficiency rating 31

SAP ratings

The energy efficiency rating is a measure of the overall efficiency of a home. The higher the rating ('A' being the highest) the more energy efficient the home is and the lower the fuel bills are likely to be.

The environmental impact rating is a measure of a home's impact on the environment in terms of carbon dioxide (CO2) emissions. The higher the rating ('A' being the highest) the less impact it has on the environment.

SAP energy efficiency rating

SAP environmental impact rating

Before improvements

Efficiency grading: F
Efficiency rating band: (21-38)

Efficiency rating: 25

After improvements

Efficiency grading: F
Efficiency rating band: (21-38)

Efficiency rating: 32

Before improvements

Efficiency grading: F
Efficiency rating band: (21-38)

Efficiency rating: 23

After improvements

Efficiency grading: F
Efficiency rating band: (21-38)

Efficiency rating: 31

Oxfordshire detached house - Energy savings breakdown

Features

Energy measurements

May 11

Jun 11

Jul 11

Aug 11

Sep 11

Oct 11

Nov 11

Dec 11

Jan 12

Feb 12

Mar 12

Apr 12

Key

Annual savings

Calculated over last 12 months

Calculated over last 12 months

Free baths and showers

SAP ratings

Before improvements

After improvements

Before improvements

After improvements

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