Author Topic: 1 gallon extract batches  (Read 830 times)

Offline FLbrewer

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1 gallon extract batches
« on: January 05, 2014, 09:05:50 AM »
I was told that you can get in the ballpark on 5 gallon recipes (and all grain after calculation) by simply dividing by 5. How true is this? How big is the ballpark? 


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Online erockrph

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Re: 1 gallon extract batches
« Reply #1 on: January 05, 2014, 09:09:28 AM »
Pretty close but you boil off volume is going to be the same regardless of how big your batch size is. Hop utilization will be a bit better because you're going to have a smaller average extract concentration but probably not enough to make a difference in most recipes.

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Offline FLbrewer

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Re: 1 gallon extract batches
« Reply #2 on: January 05, 2014, 09:44:47 AM »
Can you elaborate on the boil off volume comment?


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Online erockrph

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Re: 1 gallon extract batches
« Reply #3 on: January 05, 2014, 01:57:17 PM »
If you normally lose a gallon an hour with a 5 gallon batch, you will lose a gallon an hour for a 1 gallon batch on the same system. Ingredients can be cut by 1/5, but your boil volume should be (target final volume + boiloff) and not 1/5 of a 5 gallon batch's boil volume.

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Offline FLbrewer

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Re: 1 gallon extract batches
« Reply #4 on: January 05, 2014, 05:46:45 PM »
So 2 gallons?


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Offline klickitat jim

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Re: 1 gallon extract batches
« Reply #5 on: January 05, 2014, 06:05:51 PM »
I depends on a number of things I think. How aggressive you boil, humidity, kettle shape and surface area...

Online Steve in TX

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Re: 1 gallon extract batches
« Reply #6 on: January 05, 2014, 06:17:41 PM »

So 2 gallons?


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You can start with 2 gallons and adjust from there. Keep some pre-boiled water on hand incase your boil off is greater than expected.

If boiling indoors, kettle shape and how vigorous a boil will be the main factors.

Also, if you are fermenting in 1 gallon jugs, you will want less than 1 gallon when finished.

Offline FLbrewer

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Re: 1 gallon extract batches
« Reply #7 on: January 05, 2014, 06:20:39 PM »
For smaller batches (1 and 5 gallon) how much will too much or too little water make a difference on the final product? In extract batches (my case) I normally will add top off if it is low.
Is the point to ensure the least amount of top off water necessary, therefore boiling the majority of the volume?

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Re: 1 gallon extract batches
« Reply #8 on: January 05, 2014, 06:28:48 PM »
The main reason to avoid topping off is hop utilization. Hop utilization is lower in higher gravity wort.

I top off my 10 gallon batches because my keggle is only about 12.5 gallons (50 liter European keg) and I want my pre-boil to be about 13.2-13.5 gallons. I normally add 1.5, but sometimes 2 gallons.

Offline HoosierBrew

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Re: 1 gallon extract batches
« Reply #9 on: January 05, 2014, 07:05:02 PM »
The main reason to avoid topping off is hop utilization. Hop utilization is lower in higher gravity wort.



+1.  Full wort boil any time possible.
Jon H.

Offline FLbrewer

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Re: 1 gallon extract batches
« Reply #10 on: January 05, 2014, 08:14:15 PM »

The main reason to avoid topping off is hop utilization. Hop utilization is lower in higher gravity wort.

I top off my 10 gallon batches because my keggle is only about 12.5 gallons (50 liter European keg) and I want my pre-boil to be about 13.2-13.5 gallons. I normally add 1.5, but sometimes 2 gallons.

So you boil MORE than your end volume (mind blown) ?


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Online Steve in TX

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Re: 1 gallon extract batches
« Reply #11 on: January 05, 2014, 08:35:55 PM »


The main reason to avoid topping off is hop utilization. Hop utilization is lower in higher gravity wort.

I top off my 10 gallon batches because my keggle is only about 12.5 gallons (50 liter European keg) and I want my pre-boil to be about 13.2-13.5 gallons. I normally add 1.5, but sometimes 2 gallons.

So you boil MORE than your end volume (mind blown) ?


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My preboil is 11.7 gallons. After 90 minutes I have 10 gallons in the kettle. I add 1.5 gallons of preboiled water to the kettle at flameout (I boil while mashing and leave to the side with the lid on). I transfer to two fermenters, roughly 5.5 gallons each, leaving .5 gallon in the keg.

Ideally, my keggle would be large enough for a 13.2 gallon preboil. I lust for a 20 gallon blichmann kettle, but any decent quality kettle would do.

Offline morticaixavier

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Re: 1 gallon extract batches
« Reply #12 on: January 05, 2014, 08:39:10 PM »
I boil ~48 liters for a 40 liter batch of strong beer. In a 50 liter kettle it can get exciting at times
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Re: 1 gallon extract batches
« Reply #13 on: January 05, 2014, 08:42:01 PM »

The main reason to avoid topping off is hop utilization. Hop utilization is lower in higher gravity wort.

I top off my 10 gallon batches because my keggle is only about 12.5 gallons (50 liter European keg) and I want my pre-boil to be about 13.2-13.5 gallons. I normally add 1.5, but sometimes 2 gallons.

So you boil MORE than your end volume (mind blown) ?


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Correct. That may be something new to you if you're used to topping off, but it's standard practice when you're doing full-volume boils. Depending on your kettle size/shape and how strong your boil is, plan on boiling off about 1/2 to one gallon in an hour.

And you can always top off if you overshoot and end up with less volume than you're targeting.
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Re: 1 gallon extract batches
« Reply #14 on: January 05, 2014, 08:48:12 PM »
I boil ~48 liters for a 40 liter batch of strong beer. In a 50 liter kettle it can get exciting at times

I hear ya. I start with just under 4.5 gallons in my 5 gallon kettle. And I need to leave the lid on to be able to reach a rolling boil at that volume. Thank goodness for Fermcap.
Eric B.

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