Grumbach S 84 Hatcher

 The Finest In German Engineering!

The quality of German Engineering has long been touted as some of the finest workmanship available, and the Grumbach S 84 Hatcher is no exception! Used by Top Zoos and Bird Breeders worldwide, this 84 chicken egg capacity hatcher is the perfect choice for the serious bird breeder, and can be paired perfectly with any of the Grumbach incubators! With Grumbach, precision is the forefront of design, and with their low temp variation, automatic humidity controls, and overall state of the art electronics, the Grumbach S 84 Hatcher is a must-have!

SKU: 8012

Availability: Out of stock


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 The Finest in German Engineering

Grumbach manufactures high quality safety incubators for exotic birds and reptile eggs, and are used by the Tops Zoos and Bird Breeders around the world!

Egg Capacity

Has two stationary hatching trays with total egg capacity as follows:

84 chicken eggs, 92 small chicken eggs, 124 parrot/pheasant eggs, 250 quail/conure eggs, 60 domestic duck eggs, 30 domestic goose eggs, or 16-24 emu eggs.


1- #8012 S84 Hatcher. Includes 2 trays with adjustable racks to hold different sized eggs.


  • Low temperature variation
  • Vibration free
  • Solld State Reliability and Accuracy
  • State of the art electronics
  • Proportional thermostat and a secondary safety thermostat offer a high level of accuracy and reliability
  • Electronic regulation of temperature for maximum precision.
  • Circulation air system for optimum distribution of temperature.
  • Egg trays adjustable to each size of egg,capacity 42 chicken eggs per tray.
  • Automatic humidity control, adjustable for 40% to 99%, water reservoir 4.5 liters. It can add humidity only, very accurate.
  • Manual security thermostat for protection in case of primary thermostat failure.
  • Filter to remove dust + extra filter
  • Fresh air regulation with stainless rosette or aluminum slide

Warranty Information

All Grumbach Incubators are guaranteed for twelve months from the time of purchase. Make sure you fill out the guarantee card with the serial number for your incubator and return it to us. We can also help you locate any spare parts you may need, even if they aren't listed on our site. Please feel free to call us at (800)259-9755 or send us an email at [email protected] with any questions, parts requests, or to request service.

Frequently Asked Questions

Thank you for choosing and entrusting Grumbach Incubators to incubate your valuable eggs. On receiving your incubator please un-pack it and make sure it is fitted with the features you ordered. Please check all rollers are present plus mercury thermometer and dial hygrometer. Fill in the guarantee card and the I.D.the serial number of your incubator is printed on the back cover of the incubator,send your card to your purchasing agent, all Grumbach incubators are guaranteed for twelve months from the time of purchase.

Both the B.S.S. and S84 range of incubators are similar in the operating procedures with operating ease and precision at the forefront of their design. It is a good idea to store the shipping crate and pallet in case the incubator requires shipping to us for an overhaul or service in future years.

Please ignore any operating instructions for features not fitted on your individual incubator. 

Where to place your hatcher ?

The site chosen for any incubator is vitally important for the optimum performance of the machine.

An incubator’s temperature control works at its optimum when its surrounding environment has a reasonably constant temperature. Grumbach incubators have great insulation properties, but large external variations in temperature will affect even these machines temperature control.  Do not place your incubator where direct sunlight falls on it, as this will increase the incubators temperature due to the ‘green house effect’.

As relative humidity can only be increased within the incubator, it is important that the room where the incubator is situated, has as low as possible ambient humidity. This will in turn give you a greater field of control on humidity settings within the incubator. Kitchens and bathrooms generally have high ambient humidity levels so should be avoided.

The surface where the incubator is placed, should be level to decrease the problem of ‘egg creep’ on the turning rollers. Make sure you have sufficient room to open the door fully to allow removal of the egg trays.

How to Operate the Temperature Control ?

Once your machine is sited, plug the Incubator into the outlet and turn on the main power switch. If digital readers are fitted these will light along with the power switch. Leave the incubator running for several hours to heat up and allow the internal temperature to stabilize. The ‘Thermo Light’ will be lit continuously while the incubator is heating up and will start to flash on/off as it reaches the set temperature. The temperature settings will be set either at or very close to 37.5° C in factory prior to shipment. The two knobs marked coarse and fine are your temperature controllers. The coarse knob should be used to adjust the temperature to “close to” the desired temperature and then the final adjustments made with the fine knob. Whenever making adjustments please ensure you check the temperature regularly, as the change does not reflect instantly.

Each incubator is fitted with two additional safety thermostats. On the left hand side panel a mechanical safety thermostat is fitted. This will stop your incubator from overheating if there was a failure with the electronic primary thermostat. This is preset at the factory and should not need altering.

A third electronic thermostat is fitted close to the fan housing. This is a safety feature and will stop any heater damage should the fan stop working. This is fitted under E.E.C. law and should not be tampered with.

How to Calibrate the Thermometers ?

Each incubator comes with a laboratory high-grade mercury thermometer. These thermometers are very precise and we strongly advise that if you have a digital thermometer fitted to your machine, that you calibrate it to the same reading as the mercury thermometer. The thermometer fits into the bracket supplied on one of the turning trays and should be viewed straight on to see the blue mercury. Whenever cleaning the thermometer only use cold water.

Digital thermometers have a far quicker reaction time to small changes in temperature than mercury thermometers. Once the desired temperature is established within the incubator (set by the mercury) calibrate the digital unit to the same reading if required.

To calibrate simply remove the black plastic frame that surrounds the red plastic front, this comes off by mildly prying it with a knife or screwdriver, then remove the plastic front. Then simply use a screwdriver to turn the adjusting screw clockwise to turn the thermometer reading up or counter-clockwise to turn it down. (the calibrating screw is made of plastic so please be careful not to over-adjust, as it could damage easily.) Once the desired reading is achieved replace the front. This is safely achieved with the incubator turned on.

How to Set up the Humidity Control?

 On incubators where the auto-Humidity feature is not fitted the humidity can be increased via filling the bottom tray with water. As relative humidity is directly proportional to the surface area of water, small receptacles may be placed on the floor of the incubator with different surface areas until the desired humidity level is obtained.

On auto-humidity incubators the reservoir should be filled using distilled water to combat lime scale build up within the reservoir.  Opening or closing the Humidity flap to various degrees can alter the humidity level to suit most incubation needs. If when the flap is fully open (white line is at three o’clock) the humidity is still not as high as you require then switch on the Humidity on/off switch. By turning the Humidity up/down switch this will increase the humidity level up to 100%. Once the on/ off switch is turned on there is a small heater situated under the water reservoir, which warms the water, and so assists in evaporation hence increasing the humidity level. The up/down switch is a simple thermostat that allows you control over how warm the water gets. By using this facility in conjunction with the flap, you can control the humidity level to your exact requirements

Make sure the water level is topped up this is easily viewed through the plastic filling tube. Whenever the incubator is not in use or is being moved, empty any water from the reservoir into a bowl by removing the drain plug at the base of the filling tube and tilt the incubator forward slightly.

To calibrate the dial humidity gauge, wrap it up in a damp cloth for 15 minutes. Then with a small screwdriver turn the pointer via the screw in the back off the gauge to 100%. Then leave for it to drop to ambient humidity level (generally between 30-50 %).

To calibrate the digital Hygrometer remove the front the same as the digital thermometer. The two calibration screws are found on the side of each digital digit.  

Cool Down Timer

Cool down timers are only generally used when incubating waterfowl eggs the time clock is set the same as the turning/ timer, with each digit inserted equalling 15 minutes of no heat

 Air vent

 The air vent is a circular rose on the top front of the S84 incubator and a larger oblong grate on B.S.S. models. This allows you to manipulate how much fresh air enters the machine. For most eggs this will be left fully open, but some geese and other waterfowl eggs seem to require a slightly stale air environment, so the flap may be either partially or fully closed to suit your individual needs.

 How to clean your incubator ?

 Each incubator has been designed for ease of cleaning. All surfaces can be cleaned with warm water and a mild disinfectant. Fumigation with Formaldehyde gas is recommended between hatches. Please do not place the rollers in a dishwasher as they will bend and distort. The filter gauze should be changed annually under normal conditions but under heavy use this will require a more frequent change.  A water-sanitising tablet may be used in the water reservoir.

 Essential Spare parts

Grumbach incubators are built with reliability in mind. However over time certain parts may become warn and fail as with any other machine. This always seems to happen at the most inopportune moments and we strongly advise you to have a small number of spare parts to hand to get the incubator back up in use swiftly. These include a spare fan motor, turner motor, thermostat card and a few 3amp fuses.

A quick problem and answer guide.



Probable cause or answer

Temperature fails to reach desired level.

  1. Fan failure
  2. Thermostat card failure

Discrepancy between mercury thermometer and digital thermometer

       Calibrate Digital thermometer.

Turner not working

  1. Make sure turner is switched on, on control panel
  2. Make sure turning tray is engaged in turning are fork
  3. Make sure digits are pushed in on timer.
  4. Turner motor failure.

No power to incubator.

1. Check and change the two 3 amp fuses inside left side panel near where power cable enters the back of the incubator.

Warning unplug power source before removing any panels

2.  Make sure cool down timer is not engaged.


Stock # 8012

Additional Info

Additional Info

Manufacturer Grumbach
Model No
UPC Does Not Apply
Chicken Egg Capacity No
Goose Egg Capacity No
Quail Egg Capacity No


Pricey, but amazingReview by Renee
I had a little trouble spending this much for a hatcher, but I am glad that I did. I feel like I have a real machine, and am having perfect hatches of fertile eggs. Very pleased with this unit, and feel confident it will continue to work for me for many years to come. (Posted on 3/12/2014)

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