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Old 04-17-2012, 11:16 AM   #1
Maddoghoek
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Default Largest extract boil volume in a 7.5 gal pot?

I've been stalking for a while, love the knowledge here.

So I was wondering what people would consider the largest 'safe' amount of extract you can boil in a 7.5 gal pot? I'm looking for a final volume of 5 gal but I've been told by my LBS that 3 gal is probably the most I want to boil to avoid a boil-over. Seems a bit low to me, and I want to see how close to a full boil I can get to. Any advice is appreciated! Thanks!

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Old 04-17-2012, 11:24 AM   #2
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I normally do 4-4.5 gal in a 7gal pot and don't boil over. It has taken some practice to "see" the boil over coming and turn the heat to nearly off( and sometimes off by accident). Once I start the boil I don't turn my back because the moment I do it will start boiling over. I think next brew I will do a full 5 gal and risk it.

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Old 04-17-2012, 11:28 AM   #3
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Using "fermcap S" you can likely boil 6.5 gallons. Just be very paitient and approach boiling slowly, and keep a glass of cool water, or a spray bottle of water handy to knock the boil down if it gets violent.

Another thing you could try is to start w/ five gallons, and top up the kettle w/ additional water as you boil off to end at 5 gallons. This might be easier.

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Old 04-17-2012, 11:30 AM   #4
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I have a 7.5g pot and I safely do 5g no problem. Though I'm limited to 5g boils because that's all my stovetop can handle. Anything more I can't get a good boil.

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Old 04-17-2012, 11:48 AM   #5
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Thanks for the replies! I haven't tested the limit of my stove yet. It's not a commercial unit but it's propane at least. I'll do a dry run and see how long it takes me to boil 5 gal. Good way to check my boil-off too I guess.

The one thing I find the most confusing so far is the large discrepancies between beer calculators. Trying to hit a target IBU based on boil volume, but i'm not sure if Tastybrew.com takes boil-off into the calcs. If I use brewtarget I get totally different numbers.

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Old 04-18-2012, 01:35 AM   #6
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I just did my 1st brew last weekend in a 7.5 Gal pot.

I handled 5Gal just fine w/ no boil overs or really anything close to it throughout the whole day.

Ended up with a shade under 4.5 Gal after a 60min boil ----Next brew I'll push it up close to 6 I think.

Just my $.02 from a rookie

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Old 04-18-2012, 01:37 AM   #7
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Quote:
Originally Posted by wilserbrewer View Post
Using "fermcap S" you can likely boil 6.5 gallons.
This is what I did for years with my turkey fryer kettle and fermcap. 6-6.5 gallon pre-boil volume, 2 drops fermcap/gallon.
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Old 04-18-2012, 01:43 AM   #8
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I do 6.5 gallons in my 7.5 turkey fryer pot but it gets a little dangerous. I use Fermcap and a spray bottle or use the lid to fan the foam as it gets to the top. Haven't had a boil over yet but I don't get far from the pot, either.

Edit: Not sure if it matters or not, but that is with all-grain brewing ...

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Old 04-18-2012, 02:29 AM   #9
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Good thread Maddog. I was curious about this too since I was about to buy an 8gal pot and the difference between it and the 10gal is $14 (normal aluminum)...and I'm trying to keep this hobby as cheap as possible because of SWMBO.

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Old 04-18-2012, 02:35 AM   #10
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I have a 7.5 gallon turkey fryer pot and did all my boils in it at 6.5 to start for a 5.25 fermenter amount. I had to start the boil very carefully but it was doable.

I now use 10 gallons for 7 gallon pre-boil amounts and feeling more safe I have gotten complacent and have had two boil overs in 4 batches!

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