Direct Fire Duo 57L

1.364,71 1.803,36 

An elegant two vessel brewing set, with direct fired mash tun.

Lieferzeit: 15-20 Workdays*


SKU: BAM15222 Category:
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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 second 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 second heating element in the mash tun. The boil kettle and hot water tank are combined.

Now updated to include a 3/1 MLT kettle with our new two-piece sparge arm, a 4/1 brew kettle with dedicated whirlpool and steam condenser 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.

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.

You can choose to purchase the Direct Fire 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 elements to the supplied C20 plug ends 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 Direct Fire Duo without a system controller, in which case the system will not include a temperature sensor or plug for the heating element.

Note: The 1V1P only supports one heating element and one temperature sensor. When using the Direct Fire Duo with the EINBREW 1V1P controller, you will need to separately heat the sparge water in the boil kettle to the desired temperature. To make this easier, at the end of mashing you can plug the boil kettle heating element into the EINBREW and use the EINBREW in “preheat” mode. To save time you might want to perform this procedure once before mashing or during a mash rest as well. In any case when moving from mashing to boiling you will need to switch heating element plugs at the controller, and move the temperature sensor from the mash kettle to the boil kettle.

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 15L batches of 13P beer in the fermenter. However, because the false bottom sits 7cm from the bottom of the kettle, there is about 9L of volume under the false bottom. In order to submerge the mash bed you will want to mash at about 4 L/kG thickness. 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 49L level in the kettle. When brewing a 42L batch you will fill the kettle to about 48L and the wort will 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. Plan your recipe accordingly.

Brew Day Overview

In each kettle we install a heating element, a thermowell, and a pickup tube. In the mash tun, the false bottom sits above all the fittings on a 7cm tall stand, and we add the sparge arm in the top port. In the boil kettle we also install the whirlpool port.

During mashing, the temperature reading from the mash tun thermowell is used with the system controller of your choice to directly heat the wort while recirculating. The brew kettle is separately controlled to reach sparge out temperature. When mashing you should be sure that the wort is circulating at all times! 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. 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 to drain any unused hot water. To lauter back to the boil kettle, simply open the whirlpool port in the brew kettle, open the MLT output valve, and slowly pump the wort into the boil kettle through the whirlpool port. During boiling, the mash tun can be removed for cleaning. 

Disconnect at the red arrow to clean the mash tun and drain the pump circuit before whirlpooling.





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