1.608,40 2.047,05 

The one of a kind Craft Hardware 2 vessel HERMS brewing system.

Lieferzeit: 15-20 Workdays*


SKU: BAM05494 Category:
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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.

Now updated to include a 3/1 MLT kettle with our new two-piece sparge arm, a dedicated whirlpool port, and a tee at the pump output to eliminate hose changes through the boil! The sparge arm includes 3 heights: 9.5 cm, 17.5 cm, and 25.5 cm.

You can choose to purchase the HERMS Duo with or without a controller. Choose the optional EINBREW 1V1P system controller from the dropdown above and you will get a CE certified brew controller, made in the UK. The EINBREW controller comes with a temperature probe and power cables, all you need to do is connect the heating element to the supplied C20 plug end and your system is ready for brewing! Please consult a professional electrician. You must be sure to use an appropriate GFI outlet and circuit breaker sized for the load. You can also choose to purchase the HERMS Duo without a system controller, in which case the system will not include a temperature sensor or plug for the heating element.

Note: Although the product photos in this listing show the EINBREW controller, this is only part of the delivery if you specifically choose it in the dropdown above. The EINBREW controller is intended to be mounted on a wall, a stand for the controller is not included.

The HERMS Duo includes our standard 57L 4/2 HERMS kettle and a 57L 3/1 Mash Kettle. If you want to convert an existing 3/0 or 3/1 kettle to a HERMS kettle and build your own 2V HERMS system, you can also connect the upper HERMS coil connection in the kettle wall by drilling a 21mm hole and use one Tri-Clamp Kettle Mount 1/2″ BSP and one Threaded Tri Clamp HERMS Adapter G1/2″.

System Design

The boil kettle / hot water tank contains the heating element, the HERMS Spiral with mounting adapters, a thermowell, a pickup tube, and a whirlpool tube. A short tee with thermowell is installed at the sparge arm return port. The mash tun contains a 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 tee fitting. The pump output has another tee fitting to allow easy switching between mash, sparge, and lautering without moving any connections.

During mashing, the temperature at the sparge arm return tee is used to control the water temperature in the hot water tank (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.

The system is simple enough to completely disassemble for cleaning after every brew session: Tri-Clamp makes it easy! However the system is designed to be CIP friendly to every extent possible: care is taken to provide the right size ID gaskets for each connection to ensure they are CIP optimized. After initial system cleaning, simply recirculate your heated cleaning solution through the system from start to finish.

Tip: if you want to add a sight glass, the HERMS coil output port is a great location for it:

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

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

Batch Size

System efficiency is comparable to the Direct Fire Duo system.

Small batch size: you can brew as small as 15L batches of 13P beer in the fermenter. Keep in mind that at 3 L/KG mash thickness the mash tun will only be about 12L full. Also you will need additional sparge water in the hot water tank to cover the HERMS coil completely. The extra water will need to be dumped before lautering back to the boil kettle.

Large batch size: with the two kettle semi-sparge method, you can expect to get up to 36L 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 10L of first runnings, you can achieve up to 42L of 13P wort, or 36L of 19P wort. Anything bigger than a 42L batch, and you will risk a boilover in the boil kettle!

Remember that if you have the steam condenser mounted to the kettle sidewall, the bottom of the condenser port is at the 51L level in the kettle. When brewing a 42L batch you will fill the kettle to about 48L and the wort can overflow into the steam condenser when boiling. You will want to stick to a 36L batch, and boil carefully at that size.

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



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