On 11/05/2021 09:02, Robin wrote:
On 11/05/2021 08:05, The Natural Philosopher wrote:
On 10/05/2021 21:59, George Miles wrote:
as recommended by someone on this group
i bought a Breville
which only heats a cup full of water
and so is quicker than heating a pint
and also saves electricity,
maybe enough to pay for itself!

Points:
1/. The amount of energy needed to heat a cup of water - or two or
three - for a minute - pales into insignificance beside the amount
needed to heat a house 24x7...
2/. Any waste heat heats the house anyway so its juts equivalent to a
bit of electrical or other heating you didn't need.

3/. Only an ArtStudent„¢ would say 'maybe' - the rest should have
enough theoretical knowledge to *work it out*.

E.g. there are ~250cc of water in a mugful. Average UK water temp is
9°C and boiling is 100°C.

so that to boil one cupful takes 250 x 91 calories = 2.275 kcal =
0.00264582


Sorry but Sod's law has struck again

250 x 91 = 22.75 kCal


Bugger. Only the first cup of coffee.

Still it's a halfpenny a cup then

And £6.50 per year.



At a cost of say 17p a unit, the cost of boiling one mug = 0.045p per
cup approximately.

So if you make 4 cups per day the cost of making them will be £0.65p
per year. Maybe the kettle might pay for itself in 100 years, but it
wont last that long..


PS it is also possible to not fill a kettle to the brim.


Quite.Â* I know of no kettle that requires a pint to cover the element.



--
When plunder becomes a way of life for a group of men in a society, over
the course of time they create for themselves a legal system that
authorizes it and a moral code that glorifies it.

Frédéric Bastiat