Reflow Master Pro is the evolution of the original Reflow Master - with awesome new features, and improved usability.

Reflow Master Pro has killer features and an easy-to-use interface with beautiful reflow graphs. It comes with five built-in solder paste profiles, and a built-in webserver for adding, editing, and removing profiles, with a graphical view of how the profile will look.

Reflow Master Pro is designed to work with any toaster oven - no algorithm tuning required! That said, if you really want to tweak, you can switch from the classic Reflow Master algorithm to PID control and tune your settings to exactly how you like.

Reflow Master Pro just got a MEGA update!

Reflow Master Pro firmware just hit version 2.0 and comes with some killer new features!

The changes in 2.0 are extensive, but here's some highlights:

  • Realtime PID/Classic tuning via web interface
  • MQTT Publish Support
  • PID controls for BAKE mode
  • DARK mode for the web interface
  • FAN settings are now per profile
  • TC thermal cutoff support
  • FAN circulation support for BAKE mode
  • So much more...

Web Interface 2.0

Reflow & Bake Profile Management, MQTT Publishing, Runtime PID & Classic mode tuning!

Reflow Master Pro is WiFi enabled, and once WiFi is setup, you will have access to a browser interface to add, edit and remove reflow paste profiles and bake profiles as well as alter all of the settings via the built in web server... but that's just the begining!

Reflow Profiles

Fan settings are now set per profile, and there's also the ability to time scale your reflow profiles!

Bake Profiles

Bake profiles now have the ability to set fan speeds for circulation as well as set-point control, and are per profile!

MQTT Publishing

You can now publish reflow and bake status to a designated MQTT server, to allow for remote data logging and graphing.


The Settings page has been optimised and includes some new features like setting Aliases for TC and AUX ports!

Runtime Live Tuning

Runtime tuning allows you to tweak Classic and PID settings for Reflow and Bake modes live, while your RMP is running!

When on the runtime page, it will automatically switch between your tasks on your RMP, rebuilding the page live where possible, and auto-refreshing when required.

It's pretty slick!


  • Dual Thermocouples
  • Dual Auxiliary outputs for controlling fans or other devices
  • Reflow Mode
  • Bake Mode
  • Profile management via built in webserver
  • Extensive settings and control
  • Easy firmware updates
  • E-Kill switch support

RMP has a beautiful and easy to follow graphical display during the reflow process.

The purple graph is the paste profile selected, and the green graph is the realtime update of the temperature matching.

You get to see the SSR power being applied as well as current temperature and target temperature at the top.

The main reflow zones are also clearly labelled for you.

Bake Mode

RMP features an awesome bake mode that allows you to do timed baking of things like filament, electronics components and more.

You can add your own bake profiles for your specific needs via the web interface.

Extensive Settings

RMP ships with an extensive list of settings and options, and we'll be adding more features and flexibility in future updates!

You are able to control 2 external fans, individually, during reflow/bake and after reflow/bake. This allows you to run them at a slow speed to help circulate air during reflow, and then full power for a period of time after reflow, as part of the cooling process.

Reflow Master Comparison Matrix
Reflow Master Pro
Reflow Master
AUX Outputs
Settings/Data Storage
Internal SD FS IC
Web Interface
Reflow Profile Management
Via web interface
Via code and reflashing
Bake Profile Management
Via web interface
USB-C (5V)/DC Jack (5V)
USB Micro-B (5V)
Emergency Kill
Support for external Kill Button
Reflow Master Pro Dimensions


What do I get with my Reflow Master Pro?

  • A fully assembled and tested Reflow Master Pro
  • 2.4" Colour TFT screen
  • 2x K-Type thermocouples
  • Optional items include:
  • 3D printed case (pictured above)
  • RM Fan Controller modules for connecting up to 24V fans or other auxiliary devices to the auxiliary ports on the RMP

What else do I need to use the Reflow Master Pro?

  • Solid State Relay (SSR) ( 5V+ DC <-> 100/240V AC )
  • USB-C cable or 5V DC power source via barrel jack

Can I print my own case?

You bet! For all 2023 and 2024 RMP versions, just download the STL ZIP file and slice and print them in any colour or material you like!

The ZIP also includes an image to show you how to orient the 2 pieces on the print bed for best printing without supports.

If you'd like to make changes to the case, we've also got a STEP file of the case available as well.

Why don't I provide the Solid State Relay?

That's a valid question... Every toaster oven is different and mains power is obviously not universal and is dangerous to play with. I don't feel comfortable supplying a generic "Chinese unbranded SSR" that might be unreliable or inadequate for your specific use case. I could supply something I am prepared to endorse & support, but it would be considerably cheaper for you to source one yourself - rather than me buy one and reship it to you.

This is the SSR that I use ( 15A Model )

Are the provided Thermocouples good enough?

Yes, the K-Type thermocouples I supply are good enough for most environments and use cases, but if you are using your Reflow Master Pro in an area that suffers from high frequency noise from power or mobile antennas etc, you may get some extra noise in your temperature readings.

If that is the case, you might want to invest in a better thermocouple, something that is really well shielded in metal or fibreglass, like one of these from Adafruit

Also, if you plan on reflowing high temperature pastes 190deg+, you can use the probes that I ship, but they wont last forever at high temperature, so I'd definitely recommend investing in glass shielded thermocouples to ensure the probe shield can withstand the 200deg+ temperatures required for reflow for long term use.

How do I configure the Thermocouples?

The best way to install the TCs in your oven is to have one sitting just above the board being reflowed and one sitting just underneath. They key is to get the top one to sit about 1-2cm above the PCB, and the bottom one to sit within 1cm of the bottom.

There is no need to have one of the TCs attached to the PCB being reflowed, as that wont necessarily give you an accurate reading for the entire board, and it can be quite difficult to attach and remove the TC from your boards each time, without knocking components or smudging paste.

You don't have to use both TC's, and if you only use one, make sure you place it in the top position. When using both TC, the temperature being monitored is the average of both TCs.

What toaster oven do I need?

From my own experience and from working with other makers that use both toaster ovens and my Reflow Master, there are 2 key requirements for a toaster oven to be usable as a reflow oven: It needs to be small and powerful - so ideally you want an oven that is 18 Litres or lower in capacity, with 1300W or higher in power.

If your oven is too big or under powered, or both, then your oven will not be able to get to the initial profile temperature in time to allow for an adequate pre-soak time. You MIGHT still get a successful reflow, but it will likely be out of the guidelines from your solder paste manufacturer - so you'll need to check your specifications for your paste to assess the repercussions.

The smaller the oven, the faster it will heat, just like the higher the power, the faster it will heat. Having a smaller and more powerful oven is the safest bet.

What about hot plates?

Sure, you can control a hotplate as well if you prefer to reflow your boards that way. Your hotplate will likely be grounded, especially it's a commercial unit, or one that is powered via AC, so you wont be able to connect a thermocouple directly to it, or it will cause an error when trying to read the temperature. To solve this, you can use some thermal tape to stick the TC to the plate, that will allow heat transfer for the temperature reading, without any electrical connectivity.

Can I control the reflow process remotely?

Nope! I know it sounds like a great idea, but it's also a really a dangerous one, and it would be totally irresponsible of me to allow you to fire off a 280C or higher reflow process, both unattended and without visual monitoring. You don't leave a laser cutter unattended, and you should never leave your reflow oven unattended, especially one that is DIY'd from a toaster oven, where you are controlling mains power.

What are RM Fan Controllers?

RM Fan Controllers are basically opt-o-isolated MOSFET switches that you can connect to the AUX outputs of your RMP to drive up to 24V/1A loads like fans or in the future, stuff like linear actuators.

RM Fan Controllers ship with the surface mount parts full assembled, and the through-hole parts separate, so some soldering is required to use them, but I know you all love to solder, so it's a perfect mix!

Can I just use some cheap $2 MOSFET switches from Ali? Sure, if you want to take the risk, but I can't, in good conscience, ship something like those with my products and be able to trust and support them if they fail. So I designed and make my own, that have had extensive testing, that are built with reliable components and that I trust and can support.

RM Fan Controller
Can I reflow SAC305 with an RMP?

Sure! RMP can reflow any paste - But, what you are really asking here is, can the RMP make an oven that is not powerful enough, or insulated well enough, reflow high temp paste? No :( Physics is physics, and if your oven of choice is not able to reach the temperature required, fast enough, to manage a reflow profile for a high temperature paste like SAC305, then adding an RMP wont help.

Most toaster oven, as they come, are not capable of ramping temperature fast enough, or of holding the temperature at the higher end of the process, especially when you start to add extra thermal mass into the equation.... like PCBs wth components on them.

That said, there are many folks that have gone to extraordinary lengths to completely insulate their toaster ovens and make them capable of reflowing the most difficult pastes. Do a Google search and you'll find a few projects showing step by step how they did it, but be warned - it's a lot of effort, and costs quite a lot to make happen.

The #reflow-master-pro channel in my Discord server also has pictures and discussions from folks that have modded their toaster ovens to get high tep paste reflowing.


Hardware Installation

Wiring up your RMP is very easy. Simply connect the thermocouples to the correct coloured inputs (Red/White), connect your SSR's digital input to the +ve and -ve inputs and you're done!

If you also have some RM Fan Controllers, simply wire the +ve and -ve signal inputs from them into the corresponding +ve and -ve inputs on your RMP.

Please look into your local requirements for dealing with mains powered appliances before undertaking any DIY work.

RMP Wiring

Once everything is wired up, you are ready to power on the RMP. By default a low temp lead free paste is selected, which is a good starting point for testing out your ovens ability to ramp and cool down during the reflow cycle.

Put a blank PCB into the oven on top of the tray, to be used to add some thermal mass to the oven to simulated something being in there, and click the [REFLOW] button, and watch the graph as it follows the profile.

If your oven is able to follow the profile closely, then you should be ok with this temperature paste for your reflow process. If your oven is struggling to heat up quickly enough to follow the profile, you might need to add some extra insulation to the oven to prevent heat from leaking out. If that doesn't help, it could mean that your oven is not powerful enough for it's volume size.

WiFi Setup

You can connect your reflow Master Pro to your home/office WiFi network, so you can use the web interface to manage reflow & bake profiles, and adjust settings. To setup your WiFi SSID & PASSWORD setting so your RMP can connect to your network, follow these steps:

  • Press "Setup WiFi" on the main menu of your RMP
  • On your phone, go to your WiFi connections page and join the RMPro WiFi hotspot - if it doesn't automatically appear, refresh your list
  • Once connected, a web portal page should automatically appear on you phone, showing you a list of nearby WiFi access points. Select yours.
  • Enter the password for your network (SSID) and then click save.
  • The RMP will try to connect to that SSID & PASSWORD combo, and if successful, you will here your RMP beep, and the portal should shut down and put you back on your normal WiFi network
  • If the connection fails, it will let you know, and ask you to try again.

Once your WiFi credentials are saved, your RMP can be connected to your network using the same button on the main menu. Once connected, the button will change to show you the IP address of your RMP. You can now navigate to that IP address from any web browser on any device you like, to access the RMP web interface.

Firmware Updates

RMP Firmware

We've made updating your RMP to the latest firmware as simple as possible!

There's no need for any IDE or development environment, no need for tracking source changes or compiling any code. Updating your RMP is as simple as plugging it into your computer, putting it into "Update Firmware Mode" from the settings screen, and following the web-flashing tool instructions.

Note: The web flashing tool requires Chrome or Edge, sorry Safari users!

Buy a Reflow Master Pro

Reflow Master Pro is only shipped directly from Unexpected Maker in Australia, but I offer multiple ways to purchase, including now offering it via Lectronz for EU customers, so VAT is handled for you at check out!


The latest Reflow Master Pro schematic is available here.