Hottop Coffee Roaster - Model P


THE best coffee roaster for home roasters!
There are many home coffee roasters on the market today.  But only the Hottop is modelled on the physical and operational design of a commercial drum roaster, so it’s no surprise only the Hottop gives a comparable result to the real thing.

There are two models in the Hottop range - the 'B' and the 'P' - you are looking at the 'P'

The Hottop KN-8828P-2K (the 'P' model) and is the flagship programmable coffee roaster from Hottop!
The P controller allows you to program a roast before it starts by setting the desired time, temperature and fan speed for each of its 8 roasting segments.
Once you start the roast, the electronics takes over and intelligently adjusts the heater power to reach and maintain the temperature you requested. This allows you to program the temperature profile you want upfront and allow the controller to turn the heater on and off as required to roughly follow that profile.

The Hottop P doesn't provide the same granularity of heater control as the Hottop B. The P controller simply turns the heater full on or full off whereas the Hottop B allows variable power levels. However the extra programmability it offers over the B means it's the ideal solution if you want to program a roast and sit back and enjoy observing the process.

The P controller gives you a full sized colour LCD control panel and the capacity to save, edit and rename programs in 10 memory locations! The backlight on the display changes colour depending on the mode you're in (roasting, programming, erasing etc), and in keeping with the quality of this flagship unit, the Hottop P controller uses high-quality luxurious silicon control buttons, unlike all of the other controllers which place the buttons behind a plastic membrane.

This roaster includes a manual eject mechanism for removing the beans in case of a power failure, and a K-type thermocouple temperature sensor located more closely to the bean mass, so it is more accurate than the original sensor (though still not as accurate as our bean mass probe retrofit).

Note that this is an official full-specification 230-240v/50Hz roaster, fully approved for use in Australia.

Every Hottop B purchased from Ministry Grounds is supplied with the following with our compliments:

  •  FLAT RATE $15 shipping anywhere in Australia*

  •  FREE 500g of green coffee beans

  •  FREE 2 x 150g valved, zip-lock bags to store your freshly roasted beans

  •  FREE 10% discount gift voucher to use towards any green beans from  (excluding Cup of Excellence and some other varieties)

  •  FREE spare Hottop rear filter giving you up to 80 roasts before you need to purchase a filter

Key features at a glance

  • 250‐300g roast capacity

  • Temperature range: 80-220 oC

  • Available roast time range: 8-25 minutes

  • In-roast controls: Start, Stop, Time up/down, Fan speed up/down, Heater power up/down

  • Super‐quiet operation ‐ hear the roast, not the roaster!

  • Large external stainless steel cooling tray with forced air for fast cooling

  • Two‐stage air filter to reduce smoke output

  • Large viewing window to monitor roast progress

  • Roast memory locations: 10

  • Dimensions (cm): 48 x 25 x 35 (WxDxH)

  • Weight: 10.5kg

More Details:

  • Integrated cooling tray for rapid cooling.
    So important but so often ignored! Cheaper roasters try to cool the beans internally, taking up to 15 minutes and destroying some of the flavours.  The Hottop’s large external fan‐forced cooling tray cools beans to ambient temperature within five minutes, removing over half the heat within the first minute!

  • Consistency across batch sizes.
    Regardless of whether you roast 200g or 300g you can always get the same roasted result from a Hottop.  Consistency is a big part of enjoying coffee.

  • Bean mass temperature probes.
    Most roasters including the Hottop measure the air and chassis temperature inside the drum.  For ultimate accuracy however, an extra temperature probe can be installed to measure the bean temperature.  Only the Hottop design makes it easy to fit a bean mass temperature probe.  We can professionally install these pre‐purchase to ensure warranty integrity is maintained. See below for details.

  • Dedicated information website explains many more features and benefits.

A 12 month warranty applies on all Hottop roasters

More Information
For more information on the Hottop P roaster, you may be interested in the following links:

Temperature Probe Upgrade

Note: This is a temperature probe installation on a new roaster only, and can only be purchased as an option on a new roaster. For upgrade information on existing Hottop roasters, please contact the distributors at:

If you've already got a multimeter that can accept a K-type thermocouple, you can simply plug this probe into your existing meter. It come fitted with banana plugs to suit most multimeters
Passionate roasters have been adding bean mass probes to the bean chute covers for years but why would you want one?
The bean cracks are critical milestones in a roast, and while a given type of bean will crack at almost exactly the same temperature every time, various factors such as the ambient temperature, roast capacity and roast profile may mean the air temperature required to get the beans to crack is different - and that's what's being measured by the roaster. Since the difference between the displayed temperature and the bean temperature CHANGES as the roast progresses, you can never be sure what temperature the beans are actually at! Without accurate bean temperature data, it can be quite hit and miss knowing how soon beans are going to crack and therefore what program changes to make in anticipation of that.

The fact is that the built in probe on the Hottop - as with almost every other domestic coffee roaster - has an environmental' sensor, measuring the hottest part of the roaster - the temperature of the air inside the drum (or, in the case of the Gene Cafe, the air after it's left the drum) rather than the beans which are somewhat cooler.
The Hottop's environmental sensor is in fact better than most as it sits extremely close to the beans so it's one of the most accurate environmental sensors out there. By employing an environmental sensor the manufacturers can be certain the device isn't going to overheat and catch fire. The environmental sensor can still give an approximate indication of the temperature of the beans but it's never an exact correlation.
This then is where the Hottop comes into its own. One of the beauties of the Hottop's design is its inherent ability to have a bean mass temperature probe fitted, which is simply a temperature sensor sitting in amongst the beans as they're roasting. The drum design of most other roasters makes such an installation impossible to perform. A bean mass probe gives you an accurate figure of what the beans are doing, thus programming suddenly becomes a lot easier because you have accurate data to work on!

Temperature Probe + Datalogger Upgrade

This is an identical upgrade to the temperature probe above, with the addition of a datalogger for computer tracking and recording of your roasts:

Datalogger Usage
Use of the datalogger is very simple. Simply connect the plug on the end of the yellow cord coming out of your roaster to the datalogger via the adapter plug, making sure you line up all the positive (+) marks on the plugs and the meter. Then, rotate the switch on the meter to the oC setting and the current temperature inside the roaster will show on the screen. To enable the signal to be sent out on the USB port, press the RS232 button and an icon will show on the screen to show this setting has been enabled. Then, connect the USB lead from the multimeter to your computer and start the datalogging software (download below).
The datalogging software is free software provided with no warranty claimed or implied. Some of its key features are:

  • View a graph of the roast in real time

  • Save a .csv log of the roast when it's finished

  • Save an image file of the graph (.png format) for easy viewing later

  • Load an old roast profile as a template (e.g. a particularly successful roast you want to repeat) so you can see how the current roast is tracking compared to the known good template

  • Accepts input from up to two digital multimeters

  • Mount a webcam in front of the Hottop's display and the software will read the environmental temperature from the Hottop's screen!

Here are some links to various things you will / may need:


Information on this page courtesy of Hottop Australia
*(Note: promotional discounts are not available on this product)

Latest Reviews

Excellent Home Roaster
by on
Excellent home roaster for the price point. Been using one for many years and has been trouble free. Only outgoing costs are for consumable like filters.

For those who are serious about home roasting the data logger is recommended. The thermal sensor that comes with the basic unit measures the hottest spot in the roaster.

The data logger probe is much closer to the bean mass in the roasting chamber so give a more accurate indication of bean temperature.

This in combination with a data logger software will allow you to better evaluate and compair roasting profiles.

Takes a little while to come to terms with it's programming granularity, however, once mastered produces great and consistent results.

Highly recommended.

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Hottop Coffee Roaster - Model P

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Hottop Coffee Roaster - Model P

A more automated roasting solution which provides an easy way for home roasters to enjoy truly fresh coffee roasted exactly how you like..

Note: Spare filters available here: Rear | Top


Temperature probes, datalogger, filters for the Hottop


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