First, the big question: how much water do you really need? The answer is embarrassingly simple. Only boil what you will actually use.
Why does this matter? Because every extra millilitre is wasted energy, wasted time, and a tiny insult to your electricity bill. It’s the difference between waiting 45 seconds and nearly two minutes for your cuppa.
Seriously, have you ever watched a kettle boil a full tank just for one mug? It’s like revving a Ferrari to reverse out of a driveway. Fun, but utterly pointless.
The ‘One Cup’ Rule (A Life-Changing Hack)
Here’s the golden rule: fill the kettle to the minimum mark for a single cup. Most kettles have a visible “fill line” for one cup—use it. You’ll save roughly 30% on your energy bill over a year (that’s a lot of biscuits).
And for instant coffee? You don’t need boiling water at all. 80°C is perfect—just stop the kettle before it clicks. It preserves the flavour and makes you feel like a mad scientist.
Tea, however, demands 100°C (unless you’re a green tea rebel, in which case, lower the temperature to about 70°C). But whatever you do, always boil fresh water. Re-boiling makes it taste flat and sad. Nobody wants sad tea.
