Direct Fire Duo 83L

1.925,00 2.125,00 

An elegant two vessel brewing set, with direct fired mash tun. Choose your pump from the dropdown. The system does not include a controller, see the full description for options.

SKU: BAM22279 Category: Tags: ,
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Now updated to include two 4/1 kettles, all 1″ (22.1 mm ID) fittings, and a riptide pump option.

A two vessel brew system with direct heated mash tun, built entirely using Tri-Clamp components. Designed to minimize cost and complexity. Thanks to what we’re calling the “semi-sparge” method, we’ve eliminated the third kettle, second pump, and additional heating element that are common among 3 vessel brewing systems. The brew concept is similar to our HERMS Duo system, but instead of a HERMS coil heat exchanger to heat the mash, we add a third heating element in the mash tun. The boil kettle and hot water tank are combined.

And this is done without a big hit to system efficiency thanks to the unique semi-sparge method. 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.

Important note regarding the electrical requirements: Because of the larger volumes in the 83L kettle, this system uses three separate 3.2 kW heating elements. You will need three separate 16A supply circuits to use all 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. 

The only EINBREW controller suitable to control the Direct Fire Duo 83L is the EINBREW 3V3P, which allows simultaneous firing of all 3 heating elements. With the EINBREW you can set up to 9 mash stages and let the controller automate your mash schedule. The EINBREW controller comes with temperature probes and power cables, but the electrical assembly is rather complicated, make sure you review the wiring diagram and consult with an electrician!

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


Because of the simultaneous high power requirements, the options are somewhat limited for a brew controller with this system. The EINBREW 3V3P is currently the only option to allow full automated control of all three heating elements simultaneously. This would however be a good choice when considering upgrading later to a 3 kettle system.

System Design

All of our 83L brew systems now use 1″ sizing for all fittings, including hose barbs, valves, and dip tubes. The tubing is the larger 19 x 28 mm reinforced type. This helps maximize flow rates, especially important for mash temperature control and whirlpooling.

The boil kettle / hot water tank contains two heating elements, a short thermowell, a pickup tube, a whirlpool tube, and a trub dam. The mash tun contains a third heating element, a dip tube, a false bottom on the tall stand, the two-piece sparge arm, one long thermowell, 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.

When using the Riptide pump, the pump is placed underneath the system on the lower shelf of your brew table. You can also use the pump mount set to mount your riptide closer to the kettles (sold separately). When using the MP-15 pump, the pump is directly connected to the input manifold. The set includes the 90 elbow to make the connection.

During mashing, the temperature sensor in the MLT is used to control the wort temperature. The wort is recirculated through the MLT sparge arm, 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. 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. Now you can lauter back slowly to the boil kettle through the whirlpool port. During boiling, the mash tun can be removed for cleaning.

Once boil is complete, cool your wort with a chiller of your choosing (not included). Whirlpool with the pump as desired, and then fill your fermenter. To fill the fermenter, disconnect the hose including ball valve between the tee and the sparge arm. This attached ball valve is used to control the flow rate to the fermenter.

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

Comparison to the HERMS Duo System

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

  • Faster temperature ramp rates
  • You can use the “Mixing Method” (see below) during lautering without additional equipment cleanup
  • When brewing double batches you can start the second batch before finishing the first (depending on your controller capabilities)

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

  • Risk of overheating if mash bed compaction restricts recirculation
  • Small batches require mashing thinner (because of the tall false bottom stand, see below under batch size)

What about the danger of scorching your wort with a direct heating? My experiments and experience with direct fired mash tuns indicate these concerns are overstated. If you still have doubts, you can reduce power to the mash tun heating element to 500-1000W. This requires a brew controller such as CraftBeerPI or similar that is capable of such power adjustments. And if you still have any doubts, just go for the HERMS duo!

Batch Size

System efficiency is comparable to the HERMS 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.

Sight Glass

A sight glass (optional, sold separately) can be installed between the tee and the sparge arm valve or underneath the tee. Don’t forget an extra clamp and gasket!


Blichmann Riptide, MP-15


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