The Full Boil Advantage?
Are there any benefits to doing a full boil as opposed to a partial boil? My brew pot has an 8 gallon capacity, so I can certainly do a full boil, but does it make a difference?
The only thing I can think of is a full boil insures all of your water/wort is sanitized.
Most definitely! If you can do a full boil, you should. The biggest reason is you actually save money, because you use less hops. In putting together partial boil recipes for friends, I've found I sometimes use half as much hops in my full boil recipe. In addition, you can achieve higher IBU levels with a bigger boil. The smaller your boil, the lower your limit of IBUs. A 1 gallon boil will probably only give you a true 20 IBUs, even if you add 20 ounces of hops...
DT
Wow.. so why do IBUs change with the amount of water I add? Also, do most extract recipes factor in the idea that probably most home brewers do not have the equipment to do a full boil?
Thanks for the response!
More wort + LESS hops = less alpha acids (bitterness), in other words, less hops are trying to bitter a larger amount of beer. Less wort + MORE hops + more AA.
Also, a full rolling boil is necessary to allow the hops to isomerize and break down the hop oils. This also allows the proteins to clump together to create a little less haze, although not much. But in order to extract the hop oils, which are cohumulones, you need a full boil.
As for a partial boil, do you mean 30 minutes instead? How are you going to bitter at 30? Generally speaking, 0-5 minutes is more for aroma, 10-30 is for flavor, and 45-60 is for bitterness. These are not hard and fast rules, but pretty close. You aren't going to get much bitterness in 30 minutes.
But as for amount of water, it's just like adding flavoring to anything else. If you put one cup of Kool Aid into a gallon of water, it's good a strong. One cup into 5 gallons, it's pretty weak. Same theory for hops.
What equipment for a full boil are you talking about? You technically only need a 4 gallons pot for a full rolling boil. My original brew pot is 4 gallons, and when I did extract, I only boiled up to 2.5 gallons of water along with extract. There is no "special" equipment.
Every extract brewer I have personally met always did a full hour boil.
Maybe my question wasn't entirely clear...
Full Boil = all 5 gallons at once
Partial Boil = 2.5 gallons boiled and added to 3 gallons of water in fermenter etc
I am not talking about boil TIMES. I have hear about people boiling all 5 gallons in one shot (the "equipment" I was talking about would be a pot that is large enough to do so). I was wondering if there is a difference in boiling all 5 gallons or boiling 2.5 and adding it to water already in the fermenter.
Sorry for any confusion...im still new at this!
Oh ok... so we are talking extract, but you are asking if you can brew your extract with (example) 2 gallons of water, boil, then top up with 3 gallons, OR use extract and a total of 5 gallons to boil, then rack that into the primary?
If I understand you, yes... you can do this. I never did, but it should work fine. If I am wrong with your question, I'm sorry, apparently I don't understand.
FYI... there is really no full or partial boil for this, but I understand where you are coming from.
BrewRob wrote:
Maybe my question wasn't entirely clear...
Full Boil = all 5 gallons at once
Partial Boil = 2.5 gallons boiled and added to 3 gallons of water in fermenter etc
I am not talking about boil TIMES. I have hear about people boiling all 5 gallons in one shot (the "equipment" I was talking about would be a pot that is large enough to do so). I was wondering if there is a difference in boiling all 5 gallons or boiling 2.5 and adding it to water already in the fermenter.
Sorry for any confusion...im still new at this!
BrewRob, thats what i have been doing 2 gallon boil added to 3 gallons
That is how I usually do it too...but I didn't know if it made a difference with extract brews, but I guess it doesn't.
Thanks guys!
Ok, I was answering your question as it pertains to size of boil. As in starting with 6 gallons of water, which after an hour boil would probably boil down to about 5 gallons. YES, this will make a difference in your beers. A full boil usually has twice as much water, which effects things like absorption and utilization.
What cubx said about more wort + less hops = less AA% isn't really correct. Yes it would be correct if you did your 2.5 gallon partial boil and didn't top it off, but you are topping it off up to 5 gallons (you are essentially making a strong beer and watering it down). And even then, with only 2.5 gallons at the start, your wort would reach it's hop saturation level far before my 6 gallon boil, allowing me to produce a much more hoppy beer.
I guarantee if we use the same amount of hops, only you do a 2.5 gallon boil and I do a 6 gallon boil, that I will end up with a more bitter beer.
Can you make damn good beer doing a partial boil, hell yea! But if you have the ability to do a full boil, why not?
DT
BrewRob wrote:
That is how I usually do it too...but I didn't know if it made a difference with extract brews, but I guess it doesn't.
Thanks guys!
Whether you are doing extract or all grain, it doesn't matter when it comes to the boil. A full boil will do the same things for each way of brewing. Think about it, once you've dissolved your extract into the water you have the same wort that an all grain brewer has collected after mashing. Once you are fire up the kettle, you are at the same place as the all grain brewer.
DT