Lid on or off when boiling

[Scroogemonster]

Hi guys, I'm nearly set to go AG next year, I have a question. When doing the boil, do you leave the lid loosely on the top or leave it off. I would assume that more liquid is lost to evaporation with the lid off than with it laid loosely on the top?
Thanks
Kevin

[Jim]

Off. If you leave the lid on, undesirable compounds that should boil off condense on the lid and go back in the wort.

[Scroogemonster]

Cheers Jim, thinking of trying a barley bottom kit for a first go. Save working out quantities and all that, can anyone recommend any of his kits in particular?
Thanks
Kevin

[tubthumper]

I am just about to rackoff my barley bottom chocolate stout and it tasted good when I took a reading a few mins ago thats 1week fermenting so I think it will be a really good beer when its time in bottles to condition are up
would heartly recomend it