To descale an electric kettle, add 2 tablespoons of citric-acid descaler concentrate, fill the kettle with water, bring it to a boil, and let it stand for 15 to 30 minutes. Empty it, rinse thoroughly, then boil a full kettle of clean water and discard it before normal use. Do this every 2 to 4 months, more often on hard water.
White flakes in the bottom of the kettle, a boil that takes longer than it used to, and water that tastes faintly off are all the same problem: calcium carbonate plated onto the heating element. It gets thicker the longer it sits, and it insulates the element, so the kettle works harder and heats slower. Citric acid dissolves calcium carbonate, is food-grade, and rinses completely clean, which is why it is the right acid for something you drink from every day.
What you need
- A kettle descaler. Ours is the Think Crucial Electric Kettle Descaler (35% citric acid, 15 uses, 16 fl oz): two ingredients, citric acid and water. Fellow kettle owners can also use the Kettle and Coffee Maker Descaler for Fellow (8 fl oz), which is the citric chemistry Fellow recommends, dosed at 1 tablespoon.
- Tap water.
- A sink. Nothing else.
Steps
- Add the concentrate. Put 2 tablespoons of the Electric Kettle Descaler into the empty kettle. If you are using the Fellow descaler, the dose is 1 tablespoon.
- Fill with water. Fill to the MAX line. The concentrate will fizz when the water hits it. That is carbon dioxide from the acid reacting with the scale, and it means the descaler is working.
- Bring it to a boil. Heat the kettle as you normally would. On a variable-temperature kettle, a full boil is fine.
- Let it stand. Leave the hot solution in the kettle for 15 to 30 minutes. Go to the long end if the flakes were thick or the element was visibly white.
- Empty and rinse. Pour the solution down the sink and rinse the kettle thoroughly with clean water, swirling to lift any loosened scale off the base.
- Boil once with clean water. Fill with fresh water, boil, and discard that water. The kettle is ready for normal use.
How often to descale a kettle
Every 2 to 4 months is the baseline. Water hardness sets where you land in that range: on hard water, where you see white residue within a week or two of a descale, go monthly to every two months. On soft or filtered water, every four months is enough. Descaling on a schedule takes 30 minutes; waiting until the element is caked white can take two rounds. A 16 fl oz bottle gives 15 descales at the 2-tablespoon dose, which is two to four years of maintenance for one kettle.
What not to use
- Vinegar. It is acetic acid, weaker on calcium carbonate than citric, and the smell fills the kitchen and lingers in the kettle through several boils.
- Bleach. It does not dissolve scale and has no place in something you drink from. Never mix it with an acid descaler.
- Sulfamic or phosphoric acid descalers. These industrial-strength descalers work, but they leave residue that needs more careful rinsing. Our kettle formula has no sulfamic acid and rinses clean.
- Abrasive pads on the element. Scouring a stainless or glass kettle scratches the surface, and scratched metal scales faster. Let the acid do the work.
- Coffee-machine cleaning tablets. They remove coffee oils, not scale, and were never meant for a kettle.
Frequently asked questions
Is citric acid safe for a stainless steel or glass kettle?
Yes. The Electric Kettle Descaler is formulated for stainless, glass and BPA-free plastic kettles. It is food-grade, non-toxic, and rinses completely clean.
Which kettles does it fit?
It works in most electric kettles, including the Breville Smart Kettle, Fellow Stagg EKG and EKG Pro, Cuisinart CPK-17, KitchenAid KEK series, Hamilton Beach, Mueller, COSORI, OXO Brew and Zojirushi. The Fellow-specific descaler covers every Fellow kettle (Stagg EKG in all wattages, EKG Pro, EKG Pro Studio, Corvo EKG, Clyde) and the Aiden Precision Brewer.
Why does the kettle fizz when I add water?
That is carbon dioxide released as the acid breaks down calcium carbonate. Heavy fizzing means there was a lot of scale. No fizzing after a few descales means you are keeping up.
What is the difference between the two kettle descalers?
The Electric Kettle Descaler is 35% citric acid and water, dosed at 2 tablespoons, 15 uses per 16 fl oz. The Fellow descaler is 30% citric acid with sodium citrate and water, dosed at 1 tablespoon, 15 uses per 8 fl oz, and also covers the Aiden brewer. Either works in any kettle on this page.
Will using it void my kettle's warranty?
Each manufacturer sets its own warranty terms. Our descalers are compatible products, not OEM products, so check your warranty if that matters to you.
Products used in this guide
- Think Crucial Electric Kettle Descaler, 15 uses, 35% citric acid, 16 fl oz
- Think Crucial Kettle and Coffee Maker Descaler for Fellow, 15 uses, 8 fl oz
Breville®, Fellow®, Stagg EKG®, Cuisinart®, KitchenAid®, Hamilton Beach®, COSORI®, OXO® and Zojirushi® are trademarks of their owners and are used only to describe compatibility. Think Crucial is an independent manufacturer and is not affiliated with, endorsed by or sponsored by any of them. Our descalers are compatible products, not OEM products, and are not covered by those manufacturers' warranties; using a non-OEM product may affect your warranty. Always follow your kettle manufacturer's own cleaning instructions.