Get your HBT Growlers, Shirts and Membership before the Rush!


Home Brew Forums > Home Brewing Beer > All Grain & Partial Mash Brewing > Low OG due to not getting a rolling boil?
Reply
 
LinkBack Thread Tools
Old 04-07-2012, 11:17 PM   #1
diehl33
Feedback Score: 0 reviews
Recipes 
 
Join Date: Nov 2011
Posts: 14
Likes Given: 1

Default Low OG due to not getting a rolling boil?

I've done 2 partial mashes now, and I've gotten a very low OG (about 0.010 lower than estimated). When I did extract brewing, I would boil (rolling boil) about 2.5 gallons of wort; with partial mash, I'm barely boiling (no rolling) about 4.5 gallons - my stove top just can't get that much wort to a rolling boil. I understand this affects hop utilization, but would it affect my OG?

__________________
diehl33 is offline
 
Reply With Quote Quick reply to this message
Old 04-07-2012, 11:37 PM   #2
duboman
Feedback Score: 0 reviews
Recipes 
 
Join Date: Jul 2011
Location: Glenview, IL
Posts: 6,336
Liked 502 Times on 464 Posts
Likes Given: 226

Default

Most likely, yes because you are not evaporating out the proper amount of water to condense the wort over the same amount of time. You really want a nice boil to concentrate the wort

There are also mash efficiencies to take into account as well but first you need to get a proper boil and see how it turns out and go from there

__________________
Nothing Left to do but smile and drink beer.....

The Commune Brewing Company-Perfecting the "art" of beer since 2010
duboman is offline
 
Reply With Quote Quick reply to this message
Old 04-07-2012, 11:42 PM   #3
binaryc0de
Torrence Brewing
HBT_SUPPORTER.png
Feedback Score: 0 reviews
 
binaryc0de's Avatar
Recipes 
 
Join Date: Feb 2009
Location: Conway, AR
Posts: 226
Liked 5 Times on 5 Posts

Default

5 gallon batches? If so then you're not doing a full boil which I would recommend with partial mashes. Adding water will dilute your og. So you want to start with a pre-boil volume and boil down to 5 gal or down to your desired gravity. Most people don't have a stove in their house that can handle full wort boils (especially people like me with electric stoves). That's why typically full wort boils are done outside with propane burners. Not getting a rolling boil would not evaporate enough wort within the hour to concentrate the sugars and could cause low og but it sounds like your not starting off with enough water anyways. So you could be suffering from low extraction efficiency. Not getting to a rolling boil will also put you at risk for too much dms in your beer (a violent boil is what drives this compound off).

binaryc0de is offline
 
Reply With Quote Quick reply to this message
Old 04-08-2012, 04:04 AM   #4
Wynne-R
Feedback Score: 0 reviews
Recipes 
 
Join Date: Aug 2009
Location: Texas
Posts: 916
Liked 101 Times on 65 Posts
Likes Given: 83

Default

I find that using two pots overcomes the heat limitation of brewing on an electric stove. I use two cheap 12qt. stainless pots from a dollar store. I fill the pots alternately while lautering. The one on the bigger element comes to a boil a few minutes more quickly than the smaller one, which works out nicely. You don’t want two pots to both start boiling at the same time.

This method nearly doubles the heat, and the smaller pots fit the burners better. I used to use a 16 qt. pot, but it took forever to boil, and my batch was like 3 ½ gallon. Now I get a bigger batch ( 5gal) in less time.

The rule of thumb on the boil is to boil off at least 10% to minimize DMS.

__________________
Wynne-R is offline
 
Reply With Quote Quick reply to this message
Old 04-09-2012, 12:31 PM   #5
diehl33
Feedback Score: 0 reviews
Recipes 
 
Join Date: Nov 2011
Posts: 14
Likes Given: 1

Default

Thanks! The double pot idea is a great idea. Cheers!

__________________
diehl33 is offline
 
Reply With Quote Quick reply to this message
Old 04-09-2012, 12:50 PM   #6
ab12
Feedback Score: 0 reviews
Recipes 
 
Join Date: Apr 2012
Posts: 17
Liked 2 Times on 2 Posts

Default

I use a 34 quart pot on an electric stove and get a good boil by wrapping the pot in reflective insulation like you would use to insulate a heating duct. Works great. I start off with 6.5 gallons in the pot and it takes about 40 minutes but it boils nicely.

__________________
ab12 is offline
 
Reply With Quote Quick reply to this message
Old 04-09-2012, 01:21 PM   #7
wilserbrewer
Sponsor
HBT_SPONSOR.png
Vendor Ads 
Feedback Score: 9 reviews
 
wilserbrewer's Avatar
Recipes 
 
Join Date: May 2007
Location: Jersey Shore, Jersey
Posts: 7,299
Liked 575 Times on 470 Posts
Likes Given: 11

Default

A "heatstick" will also allow you to boil large volumes stovetop...try a search.

__________________
wilserbrewer BIAB bags
custom sized BIAB Bags, hop bags and ratchet pulleys at reasonable prices


Http://biabbags.webs.com/

Corona Mill Bucket System V. 2
wilserbrewer is offline
 
Reply With Quote Quick reply to this message
Reply



Quick Reply
Message:
Options
Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
Trouble with a rolling boil bjzelectric All Grain & Partial Mash Brewing 8 09-30-2009 08:56 PM
Rolling Boil DaanMuller All Grain & Partial Mash Brewing 2 09-17-2009 04:52 AM
All Grain Rolling Boil on the Stove gallagherman All Grain & Partial Mash Brewing 22 12-04-2008 10:34 AM
No Rolling Boil hoplobster All Grain & Partial Mash Brewing 5 02-21-2008 02:20 AM
Rolling Boil on Wort. Orfy All Grain & Partial Mash Brewing 32 02-18-2006 05:36 PM



Newest Threads

LATEST SPONSOR DEALS