Boil-off - Home Brew Forums
Register Now For Free!

Home Brew Forums > Home Brewing Beer > General Beer Discussion > Boil-off

Reply
 
Thread Tools
Old 12-18-2012, 03:22 PM   #1
Swifty
HBT_SUPPORTER.png
Recipes 
 
Sep 2011
Salina, Ks
Posts: 258
Liked 4 Times on 4 Posts



Good morning everyone,

Is there a reason I should boil without a lid? I add additional water to compinsate for the loss but would like to stop it.. When I do a 10 gallon batch, I add an extra gallon for this purpose but does it help in some way?

The only thing I can think is that it could serve to concintrate the wort a bit..

Thoughts?
__________________
Brewing up a better quote!

 
Reply With Quote
Old 12-18-2012, 03:25 PM   #2
Pecafaced
Recipes 
 
Jan 2010
Salisbury, MD
Posts: 49
Liked 2 Times on 2 Posts


Boiling without a lid allows you to get rid of DMS which can cause some off flavors

 
Reply With Quote
Old 12-18-2012, 03:43 PM   #3
Grizzlybrew
HBT_LIFETIMESUPPORTER.png
 
Grizzlybrew's Avatar
Recipes 
 
Apr 2009
Austin, TX
Posts: 1,155
Liked 16 Times on 13 Posts


Pecafaced hit it on the head. It sounds like you stumbled across the technique most all-grain brewers (and pro for that matter) use in that water usage is calculated with a boil-off amount counted in. The amount of water in the boil affects the concentration of the wort and thus hop utilization. You can top-off with sanitized water after the boil, but you (technically) would need to adjust your recipe if you were trying to hit particular numbers or replicate a beer. Why not just add extra water in the beginning and let it be sanitized with the rest of the wort? More volume lengthens your cooling time, but not by that much when you're talking about 10% volume change in most cases in AG. Extract brewers usually experience a 60% increase in post-boil and fermentation volumes (3 gal + 2 gal = 5 gal) and this defintiely affects recipe formulation and cooling time. So much to consider! Don't sweat it. Take good readings everytime you brew and you'll settle into a pattern. And, if you like your beer, RDWHAHB

Cheers
__________________
On Deck
perhaps a line of single hop IPA's - there's so many new hops out there!!!

 
Reply With Quote
Old 12-18-2012, 04:06 PM   #4
homebrewdad
HBT_SUPPORTER.png
 
homebrewdad's Avatar
Recipes 
 
Jan 2012
Birmingham, AL
Posts: 3,275
Liked 384 Times on 279 Posts


Yep, you want to boil without a lid. Otherwise, you run risks of DMS in your beer, whicih gives you canned corn/canned veggie taste.
__________________
Check out the priming sugar calculator, yeast starter calculator, and the beer calorie calculator.

 
Reply With Quote
Old 12-18-2012, 06:09 PM   #5
daksin
HBT_SUPPORTER.png
 
daksin's Avatar
Recipes 
 
Aug 2011
San Diego, CA
Posts: 4,617
Liked 357 Times on 311 Posts


Yup, you always want to boil without a lid, and should be starting with more liquid than you need to go into the fermentor. Boiloff rate is usually between 10 and 15% per hour, but will vary with your vessel.
__________________
I can't be arsed to keep up this list of what's in the fermenters, but hey, check out the cool brewery I own!

twitter.com/2kidsbrewing .. facebook.com/2kidsbrewing .. 2kidsbrewing.com

 
Reply With Quote
Reply
Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
Making my own Boil kettle: Formula for pre-boil vs post boil anyone? brewjedi General Beer Discussion 8 04-18-2016 01:56 AM
full 5 gal boil - recipe calls for 2.5 gal boil - hops ammounts? vthokie98 Beginners Beer Brewing Forum 1 12-10-2012 09:40 PM
mineral concentrations based on pre boil or post boil volume? SamuraiSquirrel Brew Science 5 10-27-2011 11:24 PM
Calculating wort expansion along with pre and post boil boil volumes greggor General Techniques 4 10-23-2009 12:01 PM
Question about water amount in full boil or partial boil neldred Beginners Beer Brewing Forum 6 10-17-2009 03:50 AM


Forum Jump