How to Make a Hot Plate- Step By Step Guide

Who doesn’t like their food warm and tasty? As you make a plate of your favorite dish and watch your favorite show, chances are you did not remember the food for a whole episode. That could lead you to wonder if only you had a homemade hot plate.

Making a DIY hotplate can seem challenging at first, but it’s actually easier than you think. The tools we will use here might be already lying around in your home.

Today we will learn how to make a hot plate with stuff you can easily get delivered to your doorstep. You will learn about all the tools you will need, how you will create the box, build the circuit, and put it all together to heat up your food in no time.

Gather the Necessary Tools

First, we will collect the hardware. To give the hotplate a shape and strength to maintain the heat, we need thin metal sheets. Collect some switches and wires along with it to connect the electric circuit.

For the electric circuit, you will need a 9V battery with a portable clip, a ten kilo-ohm resistor, a few colorful LEDs for indication.

We will take the help of a potentiometer to control the temperature. You can collect a breadboard to take the circuit on a test drive before you actually implement it. Collect a good quality mini thermoelectric cooler as well.

Once you have collected these items, make sure you have a soldering iron, solder, tin snips, wire cutters, and a heat withstanding glue to complete the hotplate setup. For safety, use goggles and gloves while working with metals and when you are using the soldering iron.

How to Make a Hot Plate

In this section, we’ll walk you through the process of making a hot plate.

 Create the Structure First

We need to create the frame and structure of our hotplate first. Don’t jump right into the metal sheets! Follow the steps to first create a sketch on paper and then go to the metal. Please maintain the safety protocols.

  • Step 1: Make a Sketch

Fix the size of the hotplate you want and draw it according to the measurements. Draw the body and the lid separately and mention the scales.

  • Step 2: Cut Out Paper Template

Cut out the paper along the lines you have drawn earlier. Double-check the measurements to be sure.

  • Step 3: Trace the Model on Metal

Take the paper designs and trace them along with the sheet metal you have collected. Use a pencil to trace and be careful about rubbing the marks away by mistake.

  • Step 4: Form the Metal Box

Use the tin snips to cut out the sheet metal along the lines you have drawn. Take adequate safety measures; for example, wear gloves and goggles to protect yourself from shrapnel.

After that, fold the sheets and form the metal casing using glue.

Design and Build the Circuit

The electric part of the system is fairly simple. Make sure you can identify the positive and negative terminals of each component and go gentle with the LEDs.

Slight over-voltage can cause them to pop, so have some spare ones at your disposal. Also, be careful while operating the soldering iron since it can become really hot (over 800 degrees).

  • Step 1: Prototype on Breadboard

It is always best to test out your circuit on a breadboard before you actually use it. Start with drawing a schematic of the circuit with the potentiometer, cooler, battery, resistor, and LEDs. Then place the components on the breadboard according to your schematic to see if everything is working.

  • Step 2: Solder and Connect

Now we will connect the electronics for real. Start off by soldering the positive side of the battery clip to the switch. Then you can add one terminal of the potentiometer to it. The LEDs need to be soldered together through the wire and connect the ten kilo-ohm resistor to a positive side of one of the LEDs.

Solder the resistor where the potentiometer is attached to the switch so that the LEDs can show status when the switch is on. The other side of the LED wire needs to be soldered to ground or neutral.

Next, the other terminal of the potentiometer will be soldered to the positive end of the cooler, and the cooler’s negative terminal will be soldered to the ground.

Put It Together

As you’ve soldered the circuit and prepared the box, you are almost there! Just a few steps, and you will become a proud producer of your very own hotplate.

  • Step 1: Attach the Cooler

Now you have a metal box and the circuit, but the cooler isn’t connected to anything yet. The miniature version of the cooler you will use has the same working principle as the one in a refrigerator. One side of the cooler will generate extreme heat, and the other one will be really cold.

You will use heat-resistive glue to attach the cooler to the box. Don’t forget the wires connected to the cooler, and you will connect it to the circuit in the next step.

  • Step 2: Connect the Circuit

Now you will solder the positive wire of the cooler to the potentiometer; this will complete the circuit; now, we are functionally ready to go. Make a hole in the box for the switch and potentiometer.

  • Step 3: Finishing Up

Now, insert the circuit inside the metal box and close the lid. Put glue around the box to ensure it is sealed and secured, and we are ready to go!


Congratulations! If you have followed our steps and worked along, you are a proud owner of a DIY hotplate. Either way, now you will have zero confusion about how to make a hot plate!

Follow our easy steps, as we have broken down the whole process into a few simple chunks. Do not forget to double-check after every step!

With great heat comes great safety precautions. So, remember our request to be safe while creating this device.

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