Quizzes & Puzzles1 min ago
what type of kettle
20 Answers
do you have, electric, or one for the hob on the gas/electric oven. Was thinking of going back to an old fashioned type for the gas cooker?
Answers
I know someone who boils a kettle full of water in the morning and uses some for a hot drink. The rest of the water is put in a vacuum flask. Later the vacuum flask water is poured back into kettle to boil for next cuppa. Is she saving money?
17:46 Sat 11th Feb 2012
Yes, of course! The effect would be fairly negligible because you'd only have the hob on for a few minutes to boil a kettle, but for the purposes of this you can consider the house a closed system, if it required X amount of energy to heat the house by 10degrees (for example) and the only heating in the house is the central heating boiler then that will have to provide X to heat the house that much, if you have a hob providing Y amount of heat then the boiler will have to provide X-Y to heat the house that much, if you had a light bulb that produced Z amount of heat on too then the boiler would have to provide X-(Y+Z) to heat the house by 10 degrees....
It a pretty basic law of thermodynamics.
It a pretty basic law of thermodynamics.
An electric heating element is pretty damn near to 100% efficient, and as all you'd be doing is heating exactly the quantity of water you needed and the cup, rather than 110% of the water and a kettle body and a cup (when you poured the water into it) then yes....
Probably not enough to worry about though as long as you only fill your kettle with as close to a amount of water you need.
Probably not enough to worry about though as long as you only fill your kettle with as close to a amount of water you need.
Chuck, im not sure that a "roaring open fire" is a suitable comparison to a gas hob that is only on for 5 minutes, also im not sure that a central heating thermostat would recognise such a tiny rise in temperature especially as it is likely to be in another room away from the kitchen, but im sure you are right:)