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HERMs Brewing instructions

A walk through on the basics of using a HERMs system (Heat Exchange Recirculating Mash) ...


  1. Dominick Heskett

    Hey David, just letting you know that when changing the temperature one degree C is equal to 9/5 degrees F. Thank you for your great videos though.

  2. Hi David, a couple of questions regarding calculation of ABV after some changes dunring and after the fermentation process. I have a Weiss beer which started at 1.062 and has made it's way down to 1.009 giving me about 7%, however after fermentation was part way through I added 2kgs of raspberries… what kind of effect would this have on abv?
    Secondly, when adding a hop tea, it should decrease the abv by diluting the beer by say 1 or 2 litres depending on the amount of water in the tea.
    How can I add these 2 changes in the calculation of final abv? Can you suggest a good calculation tool?

  3. hi David, excellent video thanks. I have a weisse beer fermenting currently that took only a few days to drop from 1062 down to 1023, at which point i threw in 2kgs of raspberries and it hasn't moved from 1023 in the week and a half since… now 1023 is too high to bottle, so would it be worth transferring to a secondary fermenter, taking some of the yeast off the bottom of the fermenter to create a starter and then pitching that back in to the secondary to try to move it down from 1023?

  4. Mervyn Borjanovic

    David, my next brew will be your Reiterated Mash Imperial Stout. Your estimated ABV was 13.5% and I notice that the Mangrove Jacks # 42 yeast has an alcohol tolerance of 12%. I was wondering if it would be better to use a yeast with a higher tolerance or is it close enough to achieve a good result. How did your Stout finish up?

  5. Hi David thank you for a very informative video , thanks Ivan

  6. Fermentation Adventures

    In scenario two, another issue could be due to an unexpected incomplete conversion of the mash. If the FG is too high, adding some amylase enzyme will help convert some more of the complex sugars.

  7. Sebastiaan Riga

    Great vid David!

  8. Thanks for putting this together! I've only made one brew (S-189 Amber Lager) so far, and it seems I've under pitched somewhat (esp. considering low ferment temps) resulting in higher FG than calculated. But, it's a learning process 🙂

  9. Yet another awesome & well organized educational video from David! Timing of the subject worked just right for me. I was just suspecting a stuck fermation with my APA batch. After 7 days of primary, my hydrometer reading was just at 1.022. I have prepared 250 ml water, 20 g sugar and 5 g US-05 dry yeast and hydrated at starting temp of 29 C for 30 mins before pitching to secondary. My fermentaion temp is 19-20 C. Tomorrow (+7 days period), I will get a reading again and see how well it worked and whether lowered the density or not.

  10. Sveinung Marvik

    Thanks for all of your videos. It's helped me get started with brewing generally, and with the grainfather specifically. "David says that…" has been uttered more than once on brewing day with my friends!

  11. Hi David, I have heard of people adding their yeast to a glass of wort to "wake the yeast up" a few hours before pitching. From what I understand it's the middle ground between a yeast starter and simply pitching yeast to the final wort. What are your thoughts on this?

  12. Thanks David for another great educational video. I have a somewhat unrelated question: what is your video introductory theme song? I love it, but I can't quite make out the lyrics.

  13. Thank you David for great Yeast tips. Love this video. I learned a lot.

  14. Great video thanks David. Is it true that you can also have a high final gravity if your mash was too high temp creating un fermentable sugars?

  15. Celsius to Fahrenheit is offset by 32f, each degC is just 1.8f.

  16. Colorado Clyde

    Wonderful!……More please.

  17. 1 degree C is 1.8 degree F. Ok 33.8 degrees F is 1 degree F, but it's the differential is the thing we need to know. That bit was confusing, but apart from that another excellent video.

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