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-   -   How to figure out boil off on first time brew (http://www.homebrewtalk.com/f39/how-figure-out-boil-off-first-time-brew-360040/)

MrRoboto 10-10-2012 12:57 AM

How to figure out boil off on first time brew
Im brewing my first batch this saturday of an extract honey wheat and I would like to do a full boil but Im not sure how to acomplish this and through my searches I havnt been able to find an answer.

Beer smith tells me based on my equipment (a 10 gallon Megapot) with a weight of 19 lbs that to obtain a 5 gallon brew I will need 5.7 gallons as the volume of water. With 8.8% evaporation rate, cooling shrinkage of 4%. and and cooling loss of .21 gallons

Does this sound accurate? Also when it says 5.7 gallons is that before or after I add my DME? Is there a more accurate way of figuring this out if you dont have any brews in the past?

chalmer9 10-10-2012 12:59 AM

Sounds about right. You won't really the specifics of your own setup until you get a few brews under your belt.

xmacro 10-10-2012 01:01 AM

I usually get about 1.5 gallons of boiloff during my full boils (5 gallon batches).

Last brew I did, I started with 5.5 gallons, wound up with 4 gallons :(

tally350z 10-10-2012 01:04 AM

I usually lose about a gallon for 60 minute boils. I think if you started with 5.7 gallons you may come up short of 5. But like stated above, without actually doing some batches with your equipment you will never know. Can guess all you want but doing it is what you need to do. Start with the 5.7 and if you come up below 5 then you know how to adjust for the next batch.

helibrewer 10-10-2012 01:05 AM

My keggle boils off about 1 gallon per hour...I think 8% is a bit shy....are you brewing outdoors or in?

4traindays 10-10-2012 01:08 AM

So, I too am making the transition to full boil. If I was to come up short of 5 gallons after boil, would I still need to top off to get to 5 in my primary? Or am I just gonna have less beer?

MrRoboto 10-10-2012 01:08 AM


Originally Posted by helibrewer (Post 4484990)
My keggle boils off about 1 gallon per hour...I think 8% is a bit shy....are you brewing outdoors or in?

It will be indoors on gas stovetop 2 burners

zeg 10-10-2012 01:08 AM

I did a test run boiling water for half an hour (or so) to get an idea of the boil-off rate before I brewed. It's not necessarily exactly the same, but it should be close.

Be careful, also, because there's really not a good reason to expect that boil-off will be a % per hour---more likely it's a fixed rate of gallons per hour (assuming you maintain a consistent boil). So if you do differently sized boils, you may need to adjust the % rate to give you the right absolute rate. (That is, if you get to that level of precision....)

helibrewer 10-10-2012 01:08 AM

First off, measure out pre-determined volumes and mark your kettle...or calibrate your mash paddle in 1/2 gallon increments. At the end of your hour, check your volume and the gravity (corrected for temp). Adjust your volume with additional water if necessary to achieve your post boil OG. Make a note and start with that much more water next batch.

unionrdr 10-10-2012 01:11 AM

I just finished a partial boil with a PM kit. After sparging,I wound uup with 2.6 gallons of wort. By the end of the 1 hour boil,it was down to about 2.4. It looked like a .5TG loss to boil off. And I got to a bouil on an electric stove at "9" on th e dial,At the end of the hot break I diasled down to "8" for a gentler rolling boil. I'm seeing a boil off of about .6 gallons.

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