[Herminator]

So I am going to be attempting a full boil this weekend.  I am still brewing extract but will be making a 10 gallon batch.  I would like to try my hand at a full boil but I have a quick question. 

Based on everything I have searched people say it depends, but I was hoping someone could give me a good average number of how much water I should start with if I was to doing a 10 gallon batch.  11 gallons?  12 gallons?

Thanks a lot for all of your help.

[tygo]

It depends 

What's your kettle look like?  Taller, narrower kettles, like a converted keg for example it's probably about 1 gallon per hour.  Wide kettles it'll be more, say up to 2 gallons per hour. 

If you want to dial it in for your system before brew day throw a few gallons into the kettle, measure at the beginning, and boil it for half a hour, and measure it at the end.  That'll let you estimate how much you'll boil off on brew day.

[Herminator]

Why didn't I think of that!  Perfect idea.  I will try the boil off exercise. 

I have 15 gallon megapot...so it is wide. 

Thanks for the tip!

[Joe Sr.]

With extract unless you are adding it all at the start of the boil you're volume will change when you add it in.

I do most of my extract as a late addition, so I would need to know my boil off rate as well as estimate the displacement/volume addition of the late add extract.  I suppose it could be figured out, but...

[Herminator]

good point.  I think i am going to add all of the extract at the beginning.  So the volume would be what...roughly 2 gallons (guessing) for a 10 gallon batch.  expecting 1-2 gallon boil off.  I will try it out this week prior to brew day.

[Joe Sr.]

I would think LME is one to one.  I don't know about DME.

Someone must have done this before.