What your starting water volume?

[dmfa200]

I'm brewing 5 gallon batches in a converted keg using a 4800w element.
My boil is so vigorous I have found that I need 7 gallons of water to end up with 5 gallons of wort.
That's about 28% evaporation.
Anyone have a similar evaporation rate?

 

[fococlimber]

I have a pretty high evaporation rate living at 5k ft elevation, in CO pretty dry here.

 

[bootney]

I just did my first full boil and started off with six gallons and and ended up with a little under five gallons of wort. The next batch I'm probably going to shoot for six and a half or seven gallons of water for boil.