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HERMS Duo 83L

2.090,00 2.300,00 

The one of a kind Craft Hardware 2 vessel HERMS brewing system. Choose your pump from the dropdown box. The system does not include a controller, see the full description for options.

Lieferzeit: 3-5 Workdays*

SKU: BAM22269 Category: Tags: ,
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Update June 20, 2022: 83L 3/1 kettles are sold out, so this set is now delivered with two 83L 5/1 kettles. Extra end caps and clamps for the two additional ports in the MLT are provided. Otherwise all functionality is the same. Please note, the 5/1 kettles cannot be used as an MLT in a direct fire mash configuration with the tall false bottom, but they are fine with the short false bottom stand in the HERMS configuration. 

Now updated to include all 1″ (22.1 mm ID) fittings, output tee design modification, and a riptide pump option. The set now includes all 19mm ID Silicone tubing with 1″ hose barbs, which roughly matches the total cross sectional area of the high flow HERMS coil. This helps to maximize the flow rate in the 83L systems. 

A two vessel HERMS system built entirely using Tri-Clamp components. Designed to minimize cost and complexity compared to a three kettle HERMS system. The brew concept is similar to our Direct Fire Duo system, but instead of a second heating element, we put a stainless steel heat exchanger in the boil kettle, and circulate the mash wort through it for a more gentle heating. By combining the boil kettle and hot water tank, we eliminate one kettle and only need one heating element. And through clever connection of the kettle outputs we eliminate the need for a second pump with only minimal hose changes. Furthermore, any heat stratification in the hot water tank is used to our advantage to improve ramp rates by circulating bottom to top through the HERMS coil.

Thanks to what we’re calling the “semi-sparge” method, we’ve eliminated the third kettle, second pump, and second heating element that are common among traditional HERMS systems. And this is done without a big hit to system efficiency. Simply mash at your standard thickness and when done, slowly layer in the hot water on top of the mash. The stratification of hot water on top of the heavy sugar laden wort allows us to effectively rinse the grains as we slowly lauter back to the boil kettle.

For more information on product usage please see our HERMS Duo Brewing Guide.

Important note regarding the electrical requirements: Because of the larger volumes in the 83L kettle, this system uses two separate 3.2 kW heating elements. You will need two separate 16A supply circuits to use both elements simultaneously! After boil temperature is reached you can usually turn off one element. The heating elements in this set include a 3m connection cable with SCHUKO male plug, but do not come pre-wired to the elements. Please consult a professional electrician. You must be sure to use an appropriate GFI outlet and circuit breaker sized for the load.

There are several options for a brew controller with this system, neither are perfect but will work. The EINBREW 3V3P is currently the only option to allow full automated control of both heating elements simultaneously. With the two kettle system you will have to change plugs and the temperature sensor at the socket when moving from mashing to boiling. However this would be a good choice when considering upgrading later to a 3 kettle system. The EINBREW 1V1P controller only allows control of one heating element. However, you can theoretically use the 1V1P to automate the control of one heating element to maintain your mash and boil temperature, and manually switch the second heating element to raise the mash temp or to reach boiling temperature. You need to pay attention and shut off the element to avoid overshooting your desired temperature. If using the 1v1p you would also need to move the temperature sensor from the sparge arm tee to the boil kettle, when mashing is complete.

Wondering exactly what is included? See the full parts lists by clicking on the version below:

Note: the stainless steel brew stand is for demonstration purposes only and is not included in the scope of delivery!

System Design

The combined boil kettle / HLT contains the two heating elements, the high flow HERMS Spiral (directly mounted in the kettle wall), 2 HERMS coil 1″ threaded Tri-Clamp adapters, a 5.5 cm thermowell, a 1″ dip tube, a trub dam, a 1″ whirlpool tube, and a blind cap. A 1″ tee with 13.5 cm thermowell is installed at the sparge arm return port. The mash tun contains a 1″ dip tube (though the false bottom on 2cm stand), the two-piece sparge arm, and two blind caps. Both kettles are connected to the pump input through a 1″ 90 elbow, 1″ Quick Clean ball valve and a tee fitting. On the pump output side, another 1″ tee is installed at the BK/HLT whirlpool port via a 1″ elbow to allow easy switching between mash, sparge, and lautering without moving any connections.

A Tri-Clamp mounting clamp is included with the set. It should be installed where the tee and the elbow are joined at the front of your brewing stand. This provides additional stability to the fittings, especially when operating the valves.

The Tri-Clamp mounting clamp shown here between the tee and the elbow. It should be screwed into the front of your brewing table!

During mashing, the temperature at the sparge arm return tee is used to control the water temperature in the HLT (boil kettle). The wort is recirculated through the HERMS coil and absorbs heat, maintaining or raising the mash temperature. When mashing is finished, the hot water from the brew kettle is slowly pumped on top of the mash water in the MLT. Simply close the output valve from the mash tun and open the output valve from the boil kettle. The hot water cleans the coil as it is transferred to the mash tun. Once the required water volume is reached in the mash tun, the pump is turned off and all valves are closed.

If necessary, you can detach the boil kettle at this point to drain any unused hot water. The temperature probe is moved to the boil kettle thermowell. When you’re ready to lauter back to the boil kettle, the mash tun output and BK whirlpool valves are opened, and the wort is slowly pumped into the boil kettle through the whirlpool port. During boiling, the mash tun can be removed for cleaning. Once boil is complete, use the HERMS spiral as an immersion chiller to cool your wort. Whirlpool with the pump as desired, and then fill your fermenter from the whirlpool arm. To fill the fermenter, disconnect the hose at the HERMS coil input. The ball valve is used to control the flow rate to the fermenter. The system is simple enough to completely disassemble for cleaning after every brew session: Tri-Clamp makes it easy!

If you need a longer hose to fill your fermenter, please purchase it separately.

Tip: if you want to add a sight glass, the bottom of the pump input tee is a good place for it:

Sight glass is optional, not included. Don’t forget an extra clamp and gasket if you add one.

Batch Size

System efficiency is comparable to the Direct Fire Duo system.

Small batch size: you can brew as small as 20L batches of 13P wort. You will only need one heating element to boil, and the grain bed will not be very deep. Also you will need additional sparge water in the hot water tank to cover the HERMS coil completely. The extra water can be used for cleaning. If you more often brew batches this small, you should probably go with the 57L system!

Large batch size: with the two kettle semi-sparge method, you can expect to get up to 50L in the fermenter of 13P wort when boiling for 60 minutes. Want to brew a stronger beer or larger batch? The limitation is the size of the mash tun. To solve this, lauter the first runnings into a third vessel, such as a plastic bucket. If you use an intermediate bucket for 15L of first runnings, you can achieve up to 60L of 13P wort, or 50L of 19P wort.

Remember that when using the steam condenser in the kettle wall, you may restrict your boil size a bit. You might consider mounting the steam condenser in the lid.

When brewing larger beers or larger volumes, you can also use a “mixing method” for lautering if you don’t want to use a third container for the first runnings. The way this works is, when mashing is finished you pump water out of the boil kettle to fill the mash tun as high as possible. Turn off the pump and open both kettle output valves. Gravity will drain wort out of the mash tun and return it to the boil kettle, mixing with the remaining water in the boil kettle. When the volumes are equalized, close the mash tun output and fill the mash tun again from the brew kettle, then allow gravity to equalize the volumes again. You can repeat this 2-3 times until the wort is homogeneous. The dip tube in the mash tun allows us to recover as much sweet wort as possible out of the MLT, but there will still be some efficiency loss because of sweet wort remaining in the grain bed as well as the HERMS coil loop. Plan your recipe accordingly. You will also need to clean out the HERMS coil if using this method as it will have sweet wort in it.

Comparison to the Direct Fire Duo System

The main advantages of the HERMS Duo compared to the Direct Fire Duo are:

  • No second heating element and second pump
  • Gentle indirect heating of the mash through the heat exchanger
  • No issues with scorching if the mash bed is compacted and sticks preventing recirculation
  • The HERMS coil can be kept in the boil kettle and used for cooling the wort

The main disadvantages of the HERMS duo compared to the Direct Fire Duo are:

  • Slower temperature ramp rate
  • If you want to use the “Mixing Method” (see below) during lautering, the HERMS coil retains sweet wort, hurting efficiency and requiring a separate cleaning
  • No second batch / double brew day advantage – you have to complete a whole brew cycle before starting the next one
  • Extra care is required to prevent grain husk from reaching the boil kettle. Recirculate the mash quick but lauter slow to prevent grain pickup from the bottom of the MLT
Pump

Blichmann Riptide, MP-15

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