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Worcester Energy Home - Energy savings breakdown

Features

Greenstar 12i System boiler
Greenskies solar panels
Greenstore ground source heat pump

Energy measurements from the condensing boiler and solar panels

May 11

Energy provided by boiler: £0
'Free' energy provided by solar: £7.89

Jun 11

Energy provided by boiler: £0
'Free' energy provided by solar: £4.55

Jul 11

Energy provided by boiler: £0
'Free' energy provided by solar: £6.24

Aug 11

Energy provided by boiler: £0
'Free' energy provided by solar: £6.93

Sep 11

Energy provided by boiler: £0
'Free' energy provided by solar: £6.72

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 gas 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 3.9p/kWh

Energy savings from the ground source heat pump

Oct 11

Cost of using Ground Source Heat Pumps: £23
Cost of using Electric heater: £31

Nov 11

Cost of using Ground Source Heat Pumps: £38
Cost of using Electric heater: £54

Dec 11

Cost of using Ground Source Heat Pumps: £33
Cost of using Electric heater: £46

Jan 12

Cost of using Ground Source Heat Pumps: £30
Cost of using Electric heater: £43

Feb 12

Cost of using Ground Source Heat Pumps: £24
Cost of using Electric heater: £37

Mar 12

Cost of using Ground Source Heat Pumps: £24
Cost of using Electric heater: £31

Apr 12

Cost of using Ground Source Heat Pumps: £15
Cost of using Electric heater: £23

Key

Grey block: Cost of using Electric heater
Green block: Cost of using Ground Source Heat Pumps

This graph represents the property's energy saving.

We have measured the ground source heat pump electricity consumption and the energy it produces to heat the home then we have calculated costs to run the heat pump and the equivalent cost to heat the home using conventional electric heating.

Figures based on the energy supplier charging a rate of 12.9p/kWh

Ground source heat pump annual fuel saving We have measured the ground source heat pump electricity consumption and the energy it produces to heat this home. To illustrate the annual fuel savings these bars represent both the comparison of the ground source heat pump running costs to the equivalent costs for heating the home with either conventional electric heating or G rated gas boiler. Figures based on the energy supplier charging gas at a rate of 3.9p/kWh and electricity at a rate of 12.9p/kWh	Conventional electric heating	G-rated gas boiler
Calculated over last 12 months Electric heater £531 Ground source heat pump £164 69% saving	Calculated over last 12 months G-rated boiler £233 Ground source heat pump £164 29% saving
Annual carbon saving The carbon emissions of the boilers are directly related to their efficiency and the amount of energy each appliance uses. Figures based on gas producing carbon at a rate of 185g/kWh and electricity producing carbon at a rate of 537g/kWh.	Calculated over last 12 months Electric heater 2211 Kg of CO₂ Heat pump 685 Kg of CO₂ 69% reduction	Calculated over last 12 months G-rated boiler 1104 Kg of CO₂ Heat pump 685 Kg of CO₂ 37% reduction

Ground source heat pump annual fuel saving

We have measured the ground source heat pump electricity consumption and the energy it produces to heat this home.

To illustrate the annual fuel savings these bars represent both the comparison of the ground source heat pump running costs to the equivalent costs for heating the home with either conventional electric heating or G rated gas boiler.

Figures based on the energy supplier charging gas at a rate of 3.9p/kWh and electricity at a rate of 12.9p/kWh

Conventional electric heating

G-rated gas boiler

Calculated over last 12 months

Electric heater: £531
Ground source heat pump: £164; 69% saving

Calculated over last 12 months

G-rated boiler: £233
Ground source heat pump: £164; 29% saving

Annual carbon saving

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

Figures based on gas producing carbon at a rate of 185g/kWh and electricity producing carbon at a rate of 537g/kWh.

Calculated over last 12 months

Electric heater: 2211 Kg of CO₂
Heat pump: 685 Kg of CO₂; 69% reduction

Calculated over last 12 months

G-rated boiler: 1104 Kg of CO₂
Heat pump: 685 Kg of CO₂; 37% reduction

Boiler and solar annual savings Savings are calculated by comparing the cost of energy to run a G rated gas boiler to the cost to run an A rated condensing gas 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 3.9p/kWh	Fuel saving	Carbon emissions
Calculated over last 12 months G-rated boiler £42 A-rated boiler and solar panels £1 Energy provided by solar £0 97% saving	Calculated over last 12 months G-rated boiler 200 Kg of CO₂ A-rated boiler 2 Kg of CO₂ 99% reduction

Boiler and solar annual savings

Savings are calculated by comparing the cost of energy to run a G rated gas boiler to the cost to run an A rated condensing gas 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 3.9p/kWh

Fuel saving

Carbon emissions

Calculated over last 12 months

G-rated boiler: £42
A-rated boiler and solar panels: £1
Energy provided by solar: £0; 97% saving

Calculated over last 12 months

G-rated boiler: 200 Kg of CO₂
A-rated boiler: 2 Kg of CO₂; 99% reduction

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 34 After improvements Efficiency grading C Efficiency rating band (69-80) Efficiency rating 78 More on Energy Performance Certificates	Before improvements Efficiency grading F Efficiency rating band (21-38) Efficiency rating 30 After improvements Efficiency grading B Efficiency rating band (81-91) Efficiency rating 82

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: 34

After improvements

Efficiency grading: C
Efficiency rating band: (69-80)

Efficiency rating: 78

Before improvements

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

Efficiency rating: 30

After improvements

Efficiency grading: B
Efficiency rating band: (81-91)

Efficiency rating: 82

Worcester Energy Home - Energy savings breakdown

Features

Energy measurements from the condensing boiler and solar panels

May 11

Jun 11

Jul 11

Aug 11

Sep 11

Key

Energy savings from the ground source heat pump

Oct 11

Nov 11

Dec 11

Jan 12

Feb 12

Mar 12

Apr 12

Key

Ground source heat pump annual fuel saving

Calculated over last 12 months

Calculated over last 12 months

Annual carbon saving

Calculated over last 12 months

Calculated over last 12 months

Boiler and solar annual savings

Calculated over last 12 months

Calculated over last 12 months

SAP ratings

Before improvements

After improvements

Before improvements

After improvements

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