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


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

--
Robin
reply-to address is (intended to be) valid