I tested whether it’s cheaper to make a cup of tea with a kettle or microwave – and the results surprised me
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WE’RE paying too much to make a cup of tea, experts warned earlier this month.
Price comparison site recently tested the cost of making tea using the kettle, gas hob and microwave - and the kettle was found to be dearer than the other two methods.
Using a covered pan on the gas hob was found to be cheapest, with 100 cups costing 87p to heat up.
But that’s not an option for those without a gas hob.
The microwave worked out cheaper than using a kettle, with 100 cups costing £1.12 to make, as opposed to £1.21.
So are microwaved mugs of water the new solution for a budget brew?
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Here reporter Harriet Cooke puts it to the test.
I never think twice about switching the kettle on at least five times a day - but I’m aware it’s one of my kitchen’s biggest fuel guzzlers.
So I decided to see how using a microwave might save my costs.
My no-nonsense - which fires up as soon as you touch it - can heat a mug of water within 50 seconds, meaning in a rush I can have a brew made in under a minute.
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According to energy efficiency database , the cost of my kettle’s 50-second water-heating effort is 1.2p.
The microwave test proves much trickier - not least because I’m super-scared of getting third degree burns.
The internet is full of warnings of the dangers of water super-heating in the microwave, where the liquid is heated to higher than boiling point but is not actually boiling.
If I disturb superheated water it could erupt in a fury of scalding water, apparently.
So I was careful. I added a wooden spoon into my mug of water which apparently prevents superheating.
I then microwaved it on the 1000W setting for 30 seconds, and stopped to tap the mug. It was nowhere near hot enough to make tea.
I blasted it for another 30 seconds, and checked again. After five rounds of this I once again tapped and carefully touched the water… to find it defiantly lukewarm. I was getting bored, and thirsty.
The tea-dious process went on and on. In the end it took 10 rounds of 30-second heating, so five minutes of microwaving in total, before I deemed my water hot enough for tea.
Five minutes of microwave heating on the 1,000W setting currently costs 3.27p - almost three times the cost of using my kettle so I definitely lost out financially.
And there’s a cost in terms of time as well.
The whole process took longer than just cooking - around 11 minutes once I had done all the tentative faffing about to check for superheating. Maybe I’m being overzealous but I didn’t want to risk getting burns.
Another problem is that it’s hard to see when the water’s reached the right temperature, unless you have a thermometer that measures water temperature, which lots of people won’t have.
I judged it ready when I saw the water profusely steaming, but it may have been boiling before that. I’m no physicist.
Given how long it took, I can’t imagine the bother of heating larger amounts of water in there.
For all the benefits of microwave cooking, while it can save considerable energy on a conventional oven, it’s not a patch on the kettle so far as my tea-making is concerned.
Having said that, I could do more to trim my kettle costs. One positive aspect of using the microwave is heating the exact amount of water needed, whereas I do tend to overfill my kettle.
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Here are some handy tips to save on kettle costs.
- Don’t overfill - pour in the number of cups you need rather than filling the kettle using the tap. This can save as much as £50 a year.
- Descale the kettle to prevent limescale building up around the element, which causes it to use extra energy. To do this, unplug it and fill it with a mixture of half white vinegar and half water. Leave for an hour then boil, let it cool, rinse it out and boil fresh water in it again.
- Some kettles tell you how hot the water is, like the Aigostar electric model, currently £34.99 from Amazon. This is useful if you don’t need to get to 100C. Green tea brews low at 70C or 80C.