Most people like to drink coffee in the morning, but I don’t like coffee, so I drink tea. I wanted a simple device to help me make tea, but actual tea makers cost around $300. I don’t even need a full coffee maker to make tea, just a hotplate, so instead of Mr. Coffee, I built Mr. Tea.

mr tea logo

One side has an adjustable hotplate, and the other side has a magnetic stirrer. The enclosure is an old PC power supply case.

37514_1475572285026_5797646_n 37514_1475572245025_2636454_n


The hotplate side was easy enough, I just tore out the guts from a hot plate I got from the store. The magnetic stirrer was just a PC fan with a hard drive magnet glued to the middle.


Turns out real magnetic stirrers for lab use are hundreds of dollars. To make the stirring pellet, I encased a small neodymium magnet inside some thermoplastic. Then I added a potentiometer to the side of the case and a power switch, so you could turn the fan on and off and adjust the speed. The hot plate is also adjustable. The main reason I wanted a stirrer was to keep from dirtying spoons. I put sugar or honey in my tea and I hated making a spoon dirty from just stirring. Plus it turns out that the magnetic stirrer works WAY better than doing it manually.


It’s kind of hard to see, but the water in this cup is being stirred by the magnet. There’s a little whirlpool in the middle.


  1. Pingback: Mr. Tea is a hot plate and magnetic stirrer in the same enclosure | Cool Internet Projects

  2. Pingback: Mr. Tea is a hot plate and magnetic stirrer in the same enclosure | Daily IT News on it news..

  3. I love this project! I make coffee all the time, and would like to not dirty my spoons when stirring-in cream and splenda. However, how do you remove the magnet once stirred?

    • Exactly, what’s the difference between washing a spoon and washing a magnet/metal part that’s in the water?

  4. Pingback: rndm(mod) » Mr. Tea is a hot plate and magnetic stirrer in the same enclosure

  5. Indeed how to you remove the magnet? And don’t you have to wash the magnet – the same way that you would for a spoon?

    How did you make the magnet food safe?

    • I usually just leave the magnet in the cup while I drink it. As long as you don’t chug, it’s pretty hard to swallow it and it’s too small to choke on. Washing the magnet just requires rinsing it off every once in a while. It’s coated in thermoplastic that’s food safe. It’s also water resistant, so the liquid kind of beads up on it and rolls off.

  6. Is it polymorph plastic you used as the thermo plastic? I just wonder how you prevent it from melting in the hot tea.

    • Yes it is. It does get a little soft while in the hot tea, but not enough to disintegrate. The tea also doesn’t stay very hot for very long, especially after you start drinking it and the volume goes down.

  7. The mixer/hotplate is a $ saver for sure but jeez u can buy some teflon encased stirring rods on Amazon for 4-5$ surely u can afford that . U coulda saved some $ by getting some nichrome heating wire and making yer own element also.

  8. Also that thremoplastic I assume is like the craft stuff u get at Amazon. It’s a poly-lactone “plastic” so depending on what chemicals (esp. aromatic hydrocarbons) yer mixin, I’d be careful what my stirring rod is covered with…just sayin.

Leave a Reply