Site Prices Update
Last Updated28th June 2022
All calculations on this site are based on current fuel prices, they are checked regularly and calculations are automatically updated.
The costs calculated based on these fuel prices should be regarded as 'good estimates', given that fuel prices vary in different parts of the county and at different time of the year.
The calculations also have different levels of accuracy depending on the nature of the calculation. For example calculating the energy use of a known power output TV is very easy compared to calculating the effect on energy savings when insulating a cavity wall.
Site Calculations
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User PricesFor several of the fuel prices on this site you can now set your own prices and all the calculations on the site will adjust accordingly.
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At Confused About Energy we aim to provide practical, impartial advice on all aspects of energy usage, climate change and ways to save money on energy bills.
All calculations on this site are based on current fuel prices they are checked regularly are automatically updated and were last changed on:-
28th June 2022
The costs calculated based on these fuel prices should be regarded as 'good estimates', given that fuel prices vary in different parts of the county and at different time of the year.
The calculations also have different levels of accuracy depending on the nature of the calculation. For example calculating the energy use of a known power output TV is very easy compared to calculating the effect on energy savings when insulating a cavity wall.
Site Calculations
| Electricity | £0.271 per unit (1 kWh) |
| Economy Electricity | £0.094 per unit (1 kWh) |
| Gas | £0.072 per unit (1 kWh) |
| Domestic LPG | £0.122 per unit (1 kWh) |
| Heating Oil | £0.104 per unit (1 kWh) |
| UK Grid CO2 Emissions | 0.233 kg per kWh used |
The main units used in this site are in the table below, For a complete explanation of power and energy Read More.
| Unit | Name | Detail |
|---|---|---|
| W | Watt | Unit of Power |
| kW | Kilowatt | 1000 watts |
| kWh | Kilowatt hour | Measure of Energy |
| L | Litre | Measure of Volume |
Please use twitter to ask a question Message @@EnergyThinking
How much does it cost to boil a kettle?
Money Savings range you could have employing this measure.
Carbon Dioxide emission range that could be saved with this measure.
We are often told to only use as much water as we need in a kettle and not to fill it to the top, but what are the potential annual saving in doing this. Well it takes roughly 4.5 minutes to boil a full (2 litre) kettle with a power rating of 3kW (kilowatts).
| Kettle | Energy to boil a kettle | Cost to boil a kettle |
|---|---|---|
| Full | 0.225 KWh | £0.061 |
| Half Full | 0.113 KWh | £0.031 |
| Kettle | Annual Energy Use | Annual Cost (and CO2 emissions) |
|---|---|---|
| Full | 164 KWh | £44.552 (38.3kg) |
| Half Full | 82 KWh | £22.271 (19.1kg) |
Well There it is, a full year of operating a kettle in this way should save you about £22.271
(19.1kg) . Less than you might imagine but if you are a real tea fiend and boil it 4 times a day you would double the saving! Every little counts.
OK, most of the energy used in boiling a kettle is used to raise the first few degrees from tap cold to lukewarm. This is one of the physical properties of water. So my question is, for 2 boils is is cheaper to boil half a kettle of cold water twice, or one full kettle of cold water once, followed by a still lukewarm half kettle an hour later?
So to boil a kellet ONLY costs £0.035.That's 2857 boils to make ONE POUND...Why does the world use boiling a kettle as an example of wasted energy!
Thanks for taking the time to comment. But you are 100x out.
£0.035 = 3.5 pence
100 pence to the pound
100 pence / 3.5 pence = 28.57 boils
Cheers
Richard
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