I have an electric kettle to boil water for tea/coffee that switches off automatically when water boils.
I can either pour cold or warn water from a sink. Warm water is not hot enough, so it will need to be boiled anyway, but for shorter time (smaller difference to a boiling temperature) and thus lower electricity.
Assuming, that I am not in a hurry (so time difference is not important), I am wondering what will be cheaper for me:
- to pour cold water (that is cheaper) and boil it longer (using more electricity), or
- to pour warm water (that is more expensive) and boil it shorter (less electricity)?
Cold water costs me 9,85 PLN/m3 and warm water costs me (9,85 + 25,88 =) 35,73 PLN/m3.
Electricity costs 0,3195 PLN/kWh.
Unfortunately, I do not know how much electricity does my kettle consume.
Am I able to calculate how should I boil water for my tea/coffee?