high evaporation loss
So, I'm trying to do some small, 3 gallon all grain batches (something I can do inside with my electric stove, since it's all of -10 F. outside these days), and was trying to find out my evaporation loss rate, just so I get get my all my mash tun run offs and sparging to push out the right amount of wort to boil.
I tried to run an evaporation test on my stove and pot I have.
Basically, it's a glasstop electric stove (it can boil about 4 1/2 gallons, but not much more than that
I am boiling in a 32 quart pot.
For a quick test, I decided to boil 2 gallons of water for an hour (lid off of course) to see what my evaporation loss rate was.
I am also at around 4500 feet elevation.
A 2 gallon boil for 1 hour left me with 1.3 gallons:
About 35% loss rate!
I had a good vigorous boil going, but nothing TOO nuts.
This seems waaaay to high.
Any ideas? Is it just my elevation? Is it that it's bone dry? Is my burner up too high and I should tone it down?
Is my boil pot too big for what I'm trying to boil?
Of course, when doing a 5 gallon batch and when boiling around 4 gallons I don't get anywhere near this loss rate. I suppose it's a function of a weaker boil, that I don't loose as much then.
Anyhow, what should I do? turn down the heat some? Or live with that number?