This post discusses a simple way to save energy, by only boiling the amount water you need to make your tea or coffee.
Making a tea… it’s a national institution, but how much energy does it take?
Today I did a quick calculation on the energy required to boil water, to check out just how significant it is. So here we are
My kettle takes 2 litres of water
The Specific Heat Capacity of water is 4.184j/g/k
Water from my tap is about 15C
So, 1 fill of the kettle takes
2 x 4.184 x 3600 x 1000 x 85 = 200Wh
To test this I used a electricity meter on the kettle, and found that I was in the right ball park, but the kettle seems to have losses of about 10%, so the actual consumption was 220Wh
220Wh is equivalent to leaving a 60W bulb switched on for 3 hours 40 minutes, but consumed in about 6 minutes.
So am I suggesting we stop drinking tea (or coffee)… no, I do love my coffee. Well lets consider this. My coffee mug can hold 250ml of coffee, slightly less if you allow for the milk. So why boil 2 litres of water if I need 1/8th that amount. Well exactly…
So next time you are making tea… just fill the kettle enough for the amount you are going to use. You could save more than 3 hours worth of lighting, along with it being faster… I like faster coffee.
BTW, isn’t funny that despite the fact that I’m a coffee drinker, I still talk about tea in this post constantly. It just seems to fit better… Comments on that are also welcome.
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