Sources & assumptions

The aim of the calculator is to illustrate the average, potential savings achieved when an old appliance, purchased in a given year, is replaced with a new energy efficient model. The savings are guideline estimates for information purposes only.

Energy and water savings data

Cold appliance energy savings are calculated on the basis of new A+ rated models replacing average, or standard, old machines and A+++ rated models for washing machines. New machine energy consumption is based on the following averages: refrigerator, 108 kWh/year; fridge freezer, 232 kWh/year; upright freezer, 176 kWh/year; chest freezer, 174 kWh/year. Washing machine energy savings are based on the replacement of old machines with the latest models that achieve an energy consumption of 203 kWh/year. Water consumption for a new washing machine is based on 37 litres/cycle.

The average energy consumption for old appliances from 1980 are based on the estimated  consumption of new appliances as they left the factory in a given year.

Sources: New machine consumption –  Market Transformation Programme briefing notes and Energy Saving Trust Analysis. Old appliance consumption – Market Transformation Programme & DECC.

Carbon dioxide savings

A conversion factor of 0.521kg CO2/kWh is used to calculate carbon dioxide savings. This is in line with the Defra GHG Conversion Factors 2011.

Equivalent electricity savings – light bulb days

The energy savings are based on a 14W energy saving light bulb being left on 24 hours a day.

Equivalent monetary savings

The unit price of electricity used is 14.39 pence per kWh. This was the average UK value for all payment types at the end of September 2011.

Source: Energy Saving Trust.

Equivalent carbon savings – balloons

A single kilo of carbon dioxide gas will occupy approximately 510 litres. Standard balloon size is taken to be 5 litres.

Source: Energy Saving Trust.

Equivalent water savings – kettles

Average usage for a washing machine is taken to be 274 wash cycles per year. Kettle capacity is taken to be 1.5 litres.

Source: Market Transformation Programme.

Total UK energy savings

This is derived from the estimate that approximately 188 million outdated appliances are still in use in Europe and their replacement would provide savings of up to 44 TWh per year.

Source: European Committee of Domestic Equipment Manufacturers (CECED).

There are an estimated 15.4 million outdated appliances still in use in the UK.

Source: Market Transformation Programme.

Applying the CECED savings formula to the 15.4 million UK appliances, their replacement would provide savings of up to 3.6 TWh per year. The average electricity usage per UK household per year is estimated at 3,300 kWh.

Source: Energywatch (now Consumer Focus).

About sources

Market Transformation Programme (MTP) is a Defra programme which supports UK Government policy on sustainable products. Its aim is to achieve sustainable improvements in the resource efficiency of products, systems and services where these are critical to the delivery of Government commitments in areas including climate change, water efficiency and waste reduction.

Energy Saving Trust (EST) is an independent, not for profit organisation promoting the sustainable use of energy and offering advice and information on how you can save energy in your home. A key part of this is ensuring that people are aware of and encouraged to buy the most energy efficient products available.

European Committee of Domestic Equipment Manufacturers (CECED) represents the household appliance industry in Europe. CECED members are European manufacturers of household appliances and national associations.

Energywatch was the independent gas and electricity watchdog. Since October 2008 they form part of Consumer Focus which is a new statutory organisation campaigning for a fair deal for consumers on energy supply and postal issues.